In memory of Prof Per-Simon Kildal

Syed Kamal Mustafa, Rosenberger Asia Pacific, Shanghai, China
Just heard the shocking news that our very lovely Prof. Per-Simon passed away few months back. I did not had enough interactions with him, only a few friendly and lovely conversations when I visited Chalmers last year for my thesis, but still remember his lunch offer everyday he used to give by personally visiting every room in the department. I am shocked and can't believe he is no more with us. Rest in peace dear Professor.

Inge Heleu, Executive secretary of URSI
Please accept the sincere and heartfelt condolences of all the members of the URSI Board and Secretariat.
We are shocked to hear that Per-Simon Kildal passed away so suddenly.

Prof Irene Gu from Department of Signals and Systems, Chalmers University of Technology
My deep condolence to Per-Simon’s family. I am deeply shocked and saddened by this. He was completely healthy, happy and so much devoted to his work and his research group. We lost a brilliant scientist and an excellent professor in the department.  I missed a very good friend and excellent colleague in the department! Per-Simon, your spirit is forever with us. You worked so hard, now please rest in peace. You will always be in my memory.

Wenjie Yu, master student in the antenna division
It's a shock to hear that Per-Simon has passed away. It's fully blank in my head when I heard the sad news. I still cannot believe it till now. Per-Simon is always very energetic and enthusiastic about work. Seldom do I know anyone at his age works that hard.
I still remember he told me that the most important thing for academic success is the passion. I still remember when I got stuck at the antenna design and was quite disappointed, he told me that it happens quite often and I have to get used to it. I still remember how excited he was when he explained his latest OTA hypothesis to me. I still remember every time I went to his office to ask him questions, he always did his best to explain them one by one to me. I still remember many times in the morning I walked along the corridor in the 7th floor of EDIT building, his office was always open while most of others were closed. I still remember every Friday afternoon he went by my office to say have a good weekend to me. I still remember when I finished my thesis defense, he was busy going to SAAB for an antenna meeting even without signing the thesis workcard and that's the last time I saw him.
Per-Simon, may you rest in peace. My deepest condolences go to your family.

A photo from the archives at the Department of Microtechnology and Nanoscience, with which Per-Simon had a lot of common research projects.

Lars-Inge Sjöqvist, CEO, Kildal Antenn AB
Dear Cécile, Madeleine and Susanne, it was really a sad moment then you gave me the message that Per-Simon passed away, my sincere condolences to you. He was very proud and grateful for his family.
Per-Simon and I have been in daily contact the last two and half years. I have told many people about my exciting job together with Per-Simon, he had so much energy, creativity and was always eager to go forward. This is characteristics of Per-Simon as I wish many more people should have. That he now has left us is really hard to understand and makes me sad. We have to continue with Per-Simon’s many inventions and ideas.
It has been a privilege to work together with the entrepreneur Per-Simon with development of the corporation Kildal Antenn AB, Gapwaves AB, RanLOS AB and Bluetest AB.
My best way to honor his memory is to continue and develop the companies as he started and make them to great powerful corporations which will deliver products and solution based on all his inventions all over the world.
Per-Simon rest in peace! 

Prof.Manuel Sierra Castañer, Universidad Politécnica de Madrid
When I heard about the sad news I could not believe. I had been discussing with Per Simon during the first day of EuCAP about the plans in Madrid during the next ESoA Antenna Measurement Course this June. I think Per Simon has been a brilliant researcher for the antenna community and I am sure that his legacy will be studied by future generations. I also want to send my and my wife’s warmest condolences to Per Simon’s family, especially to Cécile: we will always remember the good moments we spent together in difference conferences. All the best in these difficult weeks.

Oscar Rubiños-López, University of Vigo
When two weeks ago Eva sent me an email with the subject "Tristes noticias", I was truly shocked. It is really difficult
to express my real feelings in few words. I visited Chalmers in 1994, 1995 and 1997,just when I started my research activity.A lot of nice moments come to my mind. Later, the life led us along different ways, but people like you Per-Simon,who have marked our lifes, will always remain in our hearts forever. Thank you, Per Simon. You will be alive forever in our hearts.
To your family and friends, my deepest condolences.

Esperanza Alfonso Alós, Gapwaves
Dear Per-Simon,
It is hard to believe that you are not coming back. I never thought this could ever happen. You always had so much energy, so many projects and dreams to realize…
I met you first time about ten years ago when I was taking a course of the European School of Antennas in Lausanne. You were one of the teachers. At that time I was far from know you well, but I could already feel there was something extraordinary in you. Sometime later, I had the opportunity of visiting you at Chalmers during my PhD studies in Valencia. In this way, we initiated a collaboration that would last forever. Years later, I was working with you, first at Chalmers, and then at Gapwaves. Thank you Per-Simon for that. It has been and is a great adventure!
My first thought is with your family. Second, the uncertainty of how is going to be without you here. You were always everywhere, involved in all activities, supporting us in many ways… with your work, knowledge, experience, ideas, courage, patience, eagerness… Third, an emptiness when I realize you will not be back. You were always there when tricky problems came up, to listen carefully, to think about it, to give a good advice, so I never felt alone. Even when we did not see each other for a while, you were always following my developments and looking forward to my progress. I am going to miss you, Per-Simon. I would have liked you to walk beside me a longer distance… but you are already part of my life. I have learnt so many things from you… I will try to use them in the best way possible.
Thank you, Per-Simon. Rest in peace.

Xinping Wang (Tony), Director of Technical Cooperation, Huawei Technologies Sweden AB
Dear Prof.Kildal,
Through the first cooperation with Chalmers University of Technology, I had the honor to meet with you, and your enthusiastic and visionary impressed me.
At Huawei Sweden 15 Years Gala Dinner, I still remember the night we talked and planned our more cooperation schedule in the future.  
Thank you for everything you have done for us. It is deeply sad to lose you, such a talented professor!
Dear Prof. Kildal, may you rest in peace.

Friends at Ericsson AB, through Björn Johannisson, Ericsson Research
Dear family of Per-Simon, dear friends and colleagues,
Receiving the message of Per-Simon’s sudden and tragic death took us all with shock. With him, the antenna community lost one of the most colorful and inventive persons. Per-Simon always had the curiosity and energy to drive his ideas forward. Those ideas developed during time, and he often surprised us with new perspectives and applications that we had not thought of. Ever since Per-Simon was installed as professor at Chalmers we have been close to him and his research and work. Many persons at Ericsson have been educated by him, and learnt how to become independent researchers. Sometimes we collaborated with great success, and other times we didn’t find common ground for joint activities, but we always knew and respected the excellent knowledge and capability of Per-Simon.
It has been a long journey together, with a lot of memories, that now ended so sudden.
We give our deepest condolences.

Michael A. Jensen, Professor, Brigham Young University
The IEEE Antennas and Propagation Society is deeply saddened by the loss of Prof. Per-Simon Kildal. Many of our members had vigorous and stimulating technical exchanges as well as enjoyable social interactions with him over the years. He was a strong supporter and contributor to the antennas and propagation community, and he found many ways to serve to improve our professional society. We are all grateful to have had our association with him, and our memory of his kindness and technical excellence will remain with us.

Giuseppe Vecchi, Professor, Politecnico di Torino, Italy
As all worthy people Per Simon will be remember for his deeds, his passion and friendship to many of us.
May the force of his life help his family overcome the loss.

Sjoerd Haasl, PhD, KTH School for Technology and Health
It was with shock that I heard about the sudden passing of Per-Simon. He was a uniquely driven researcher and entrepreneur. Over the six years that I had the fortune to work with him, I kept on being amazed at his energy, stamina and ability to continuously inspire and persevere. Not a single meeting, be the subject tough or mundane, that did not start and end with joy. His scientific integrity commanded the greatest respect and he led by example. I will carry his memory and continue to draw inspiration from him for the rest of my life.
My most sincere condolences to the family.

Silvia Raffaelli, PhD, Senior RF/Antenna Scientist, Airgain, Cambridge, UK
Dear Per-Simon,
You have been the supervisor for my PhD.
You have been a great teacher and an exceptional person,
being patient with our studies but firm so we would not wander and loose our goals.
I can still hear your valuable teaching and your jokes.
I can still remember the team dinners and days out, the team buildings,
like they were yesterday....always a great fun!
You were the Antenna group in Chalmers!
My deepest condolences goes to his family, Cecile, Madeleine and Susanne. May your soul rest in peace.

Jon Anders Aas, Retired, Norwegian University of Science and Technology
I have known Per-Simon since he started his Ph.D. studies at the Norwegian Institute of Technology in the mid 1970s, and we had through his years in Norway various collaborations and interactions. What characterised him as student was his determined work resulting in a profound understanding of antenna theory and design. I think he was particularly pleased when he managed to come up with some of his many original concepts and apply them with great endurance to practical challenges. Besides soon becoming a reputed expert in the antenna community, he had a warm and winning personality, proved by his huge net of contacts. The message on his tragic death shocked us all deeply, and we will send our warmest condolences to Per-Simon’s family. He will be greatly missed!

André van Es, Engineering Projectmanager SADT/MFAA
Dear family and colleagues,
I was shocked to read that Per-Simon has died. From my days at ASTRON I remember Per-Simon as enthusiastic and brilliant antenna designer. No doubt his ideas will be part of the SKA.
My condolences to his family, friends and his colleagues at Chalmers,

Anna Hylander, Göteborg & Co, and Malin Erlandsson, Swedish Exhibition & Congress Centre
When Per-Simon in 2010 initiated plans of bringing EuCAP to Sweden and Gothenburg we had the great pleasure of working close with Per-Simon for a few years. From the very first contacts all the way thru the celebration of the well effectuated conference in 2013 it was always a joy working with Per-Simon. It is with great sorrow we receive the message of his sudden pass. We will especially treasure Per-Simon’s curiosity, friendliness and smile; sincere interest and dedication to the project.  Gothenburg has lost a true ambassador. Our deepest sympathy to Per-Simon’s family and colleagues.  

Ivica Crnkovic, ICT area of Advance Director
During a short period I knew Per-Simon, I found how outstanding researcher and how pleasant, open, enthusiastic, and nice  person he was.

Sembiam R. Rengarajan, Professor, Department of Electrical and Computer Engineering, California State University
I am shocked and deeply saddened to know of the passing of my friend and colleague Per-Simon Kildal. I first met Per-Simon in the summer of 1990 when I had a short sabbatical with him at Chalmers. I have always been impressed by his brilliant mind and his prolific contributions to many facets of antennas and electromagnetics. He was close to his family and was always willing to help his students and colleagues. He will never be forgotten by the electromagnetics community.
Rest in peace my friend!!

Rob Maaskant & Marianna Ivashina, Division of Antenna Systems, Chalmers University of Technology
Dear Per-Simon, we have had such a joyful time over the past years, accompanied with lots of laughter, we shared our feelings when it came to upsetting moments, celebrated victories, challenged our brains, we have had discussions on politics, history, raising children, research funding opportunities, talked about teaching and supervision, even business management, patents, and what not. You went full speed taking that new height toward your future vision. You was on top of your game, strong-minded and full of ‘out-of-box’ ideas, no skepticism could stop you from pursuing your goal. You had the mindset of a winner, making both friends and 'enemies', but this made the difference and led to new opportunities. It is difficult to comprehend that such a dynamic and powerful energy source could stall so abruptly. When the realization came, you expressed the wish that your research would need to be carried on. We are very thankful for all the lessons you have taught us and will memorize all the moments we have had, both at and outside of work. This is an immense loss, in many ways. Please accept our final salutes and hugs, we miss you a lot. Our thoughts are with your family: Cécile, Madeleine and Susanne.

Mojtaba Zamanifekri, PhD, RF & antenna modelling engineer, Cavendish Kinetics, The Netherlands
I simply can not believe what I see in this page. When the tears are coming out of your control you should know something is very wrong with life.
Per-Simon was one of the greatest people that I have ever known.. he was the amazing mentor to me..the news is so shocking that It is difficult to express the real feeling here.. I am honored that I had a chance to spend few months in his research group. Few months that changed my life so drastically....
 My deepest condolences to his family and his colleagues . It is very hard to imagine what they are going through in this difficult time.

Per-Simon will always be remembered by us at Bluetest as the founder that got everything started. He was always full of energy and enthusiasm. And he loved to think outside the box.
For the start of antenna testing in reverberation chambers, he was the unbending force that pushed an abstract idea, that was plenty counter intuitive at the time, into first becoming a physical experiment and later through hard work by many people into a sophisticated line of products.
He also planted the seed of this idea in the antenna community. That would later grow into acceptance and full embrace of this measurement method in the industry.
We are now many people that reap the fruits from the tree that Per-Simon planted when he founded Bluetest.
Thank you, Per-Simon. Rest in Peace.
Our most sincere condolences for the family of Per-Simon.
Anton Skårbratt, Christian Lötbäck Patané, Daniel Adolfsson, Emelie Johansson,
Erik Lundin, Johan Nygårdh, John Kvarnstrand, John Åsberg, Karina Espejo,
Kent Thomra, Kerstin Hården, Kirk Anderson, Kjell Olovsson, Madeleine Andrén,
Magnus Franzén, Mats Kristoffersen, Michael Kwan

Kashif Mahmood, PhD, Research Scientist at Telenor Research, Norway
I had the pleasure of working with Per-Simon in the Chase Centre at Chalmers. There is hardly anybody who would doubt his technical prowess but what stood out for Per-Simon was his humble nature. He will surely be missed. My sincere condolences to his family.

Ali Khaleghi, Research fellow/Professor, Norwegian University of Science and Technology
I tried to write a condolence message several times on this page, but I could not accept that we missed Per-Simon. Now, Prof. Kildal, a real scientist, and engineer who could bring the brilliant ideas in practice is not among his colleagues, friends, and family. Per-Simon personality made him such a great person, he will live on in our memories forever.
Per-Simon was my Ph.D. defense examiner in Supelec-Paris in 2006. During the last four years, I worked with him closely on Gapwaves, visited him several times in Chalmers and met him in most antenna conferences. We had several plans for production of Gapwaves, and novel ideas for active wireless measurements. My last meeting with Per-Simon has been organized in Davos. Sadly! He left us. I extend my sincerest condolences to his family and all his friends and colleagues.

Nima Jamaly
I have been profoundly saddened by this news. I express my sincere condolences to Kildal family, his respectable wife, brother, Susanne and Madelene, and all colleagues and students and friends who worked with him. I have never seen anyone in my life more dedicated to his work than Per-Simon. His ability to tie the theory to practical applications was exceptionally unique. His deep insight and astonishing intuitive feeling in Electromagnetics has always been inspiring for me. I will never ever forget Per-Simon's valuable favour and kind support during the hard time of my life in summer 2009. He will be in my memories and within my heart forever…

Yasuhiro Kazama, Professor, Faculty of Health Sciences, Tsukuba International University, Japan
The first time I knew your name, Per-Simon Kildal, was on one day, July in 1982. At that time, you were still with Norwegian Institute of Technology. On the day, my teacher, Prof. Shinobu Tokumaru, Keio University, came to my Company's office (Janan Radio Co.) with perplexed look, and showed me one IEEE AP-Journal, entitled "Dipole-Disk Antenna with Beam-Foming Ring". At a glace, I was speechless with terror, because a few month ago, I submitted a patent application to the Patent Agency in Japan, which was for INMARSAT Antenna use, and the idea of the article of IEEE Journal was almost the same as my idea. Over ten years after, I had an opportunity to meet Prof. Kildal. Since then, we were good friends and in Sept. 2005, Prof. Kildal invited me to his office in Chalmers University of Technology, where I had a fruitful discussion with his students. In Aug. 2007, Prof. Kildal visited Japan to attend ISAP held in Niigata. At that time, I and my wife invited him to Kabuki. Prof. Kildal, I and my wife will never forget you in our memories.   rest in peace.

Haiguang Chen, Senior RF engineer, Huawei technologies Sweden AB
Dear Per-Simon,
You left us with a shock! I still look forward to meeting you for our project while being aware that this is not possible any longer. You are so smart and always ready to answer any question. I learned a lot from you. Thank you very much!
You are also energetic, your email is usually sent out in late evening or weekend. I can't believe that you are away from me and no email from you any more. I will never forget you.
Rest in peace, dear Per-Simon

Erik Lier, Technical Fellow, Lockheed Martin Space Systems Company
It was with shock I received the very sad news about my friend and colleague Per-Simon Kildal's death. Per-Simon and I worked closely together for 15 years at the university in Trondheim where we carried out some groundbreaking research together. We went to conferences and meetings together, and we continued to keep in touch after he moved to Sweden and I to the US. One particularly funny memory was when we were lost in Orlando because we had forgotten which Days Inn we stayed at out of the 20 of these hotels in town. He was as human and fun to be with as he was brilliant. He will be deeply missed. My thoughts and prayers are with his family.

Arthur Yaghjian,  Concord, MA,  USA
Per-Simon would smile when I referred to him as a “real” engineer.  He was “real” in many ways: authentic, truthful, unafraid of emotion, original, a brilliant scholar and educator.  His premature death is an immeasurable loss.  My deepest condolences to his family and friends.

Dr. N. Granpayeh, Faculty of Electrical Engineering, K. N. Toosi University of Technology
The antenna community has lost a great scientist with passing of Prof. Per-Simon Kildal, the distinguished member of the Center of Excellence in Computation and Characterization of Electromagnetic Devices and Subsystems of K.N. Toosi University of Technology, Tehran, Iran.
In this sorrowful time, we would like to extend our deep and sincere condolences to the World Antenna Societies, our colleagues and Prof. Kildal's family.
Prof. Kildal is greatly missed by all his family, students, friends, and colleagues.
/Center of Excellence in Computation and Characterization of Electromagnetic Devices and Subsystems, K.N. Toosi University of Technology, Tehran, Iran

Börje Johansson, Retired DoS
During my time as Director of studies for the WPS-programme a Chalmers, I had the privilege to get to know Per-Simon. I held this in fond memory.

Bengt Gustafsson, Gothenburg, partner for some of Kildal ideas and patents.
Per Simon, It was with surprise and great sadness I learned that You have left us. I had hooped, in our now later period of life, to get an opportunity for increased contacts, to review and discuss the good sides and result of our cooperation. And also find a mutual relaxed attitude regarding situations where conditions were more complex. I am greatful for the experience it has been working with you and your ideas. It has increased my understanding professionally, as well as for other aspects of life. I would also like to express my deepest regrets and sympathy with your family.

Ozlem Aydin Civi, Professor, Middle East Technical University, Dept. of Electrical and Electronics Engineering Ankara, Turkey
When we left Davos, we had a hope that Per Simon would recover. I'm deeply saddened by the loss of Per Simon. I've known him for 20 years.  He was a prolific researcher, great engineer and very nice person. We will miss him.He will not be forgotten. My deepest condolences to Per Simon's friends and to his family.

The photo was taken in 2010 during dinner of Gap Waveguide Workshop organized by Per Simon in Gothenburg.

Asta Pellinen-Wannberg, ordförande, svenska nationalkommittén för radiovetenskap (SNRV)
Gudmund Wannberg, EISCAT Deputy Director (Technical) 1986-2008
Vi är bestörta och djupt berörda av nyheten om Per-Simon Kildals alldeles för tidiga bortgång. Per-Simons första stora projekt, EISCATs VHF-antenn, bidrog starkt till att göra EISCAT till världens ledande inkoherentradarsystem.  Den har tjänat generationer av EISCAT-forskare och studenter väl och är fortfarande i full drift efter mer än trettio år.
Som EISCAT-användare och senare som ansvariga för olika delar av den svenska radarbaserade rymdforskningen kom Per-Simons arbete att direkt påverka våra yrkeskarriärer och vi kom under åren ofta att träffas på möten och konferenser, senast vid EuCAP 2013 i Göteborg. Då var han så full av livslust och arbetsglädje att vi inte kunde föreställa oss annat än att han hade många aktiva år att se fram emot. Vi sänder vårt varma deltagande till Per-Simons familj, kolleger och vänner. Vila i frid.

Yahya Rahmat-Samii Distinguished Professor, University of California at Los Angeles (UCLA)
When I received the saddest possible email from Eva I was truly shocked. We lost one our most accomplished friend and colleague -- Per-Simon. We lost an outstanding researcher, engineer and buddy. I have so many fond memories and photos with Per-Simon that will stay with me forever. Ironically when in mid 80's I was a guest professor at the Technical University of Denmark I was invited by Per-Simon to visit him at his university in Norway. My visit was over the US 4th of July and he was an amazing host. We went fishing and interesting enough at the midnight while we were fishing we observed a rainbow in the sky (long summer nights in Norway). I never forget that majestic moment and the two photos show how successful we were in catching so many fish at the midnight! Another occasion when Per-Simon was a distinguished professor at Chalmers University he invited me to be an external reviewer for a post PhD doctorate defense. It was another occasion that he and his lovely family showed their outstanding hospitality to me and my family. We all became great friends and at every New Year occasion we exchange good wishes. I still have many of the good wishes cards and personal notes that he and his beautiful family shared with us. Not only Per-Simon and I were great friends we also shared very similar passion about electromagnetics and antennas. In particular, areas such as reflector antennas, wireless communications and meta surfaces created amazing forum for us to deeply discuss these subjects and occasionally even get mad at each other! Many creative outcomes resulted from our intense debates on these subjects. He was masterful in presenting his material very clear and you always left his talks with the gratitude that you learned something new. Not many people in our profession can do this systematically and in every occasion. We were together at many conferences worldwide and the attached photo is one taken in a conference in Nice France in 2005.  I very much miss my Electromagnetic Viking friend and colleague. I extend my sincerest condolences to his family and all his collaborators.

Per-Simon and Yahya fishing in Norway 1985.

Ahmed, Per-Simon and Yahya in Nice, 2005.

Sven G Gustafsson
När Per-Simon för många år sedan utnämndes till professor med inriktning på antennteknik vid Chalmers, hälsades detta med tillfredsställelse även på Ericssons radardivision i Mölndal. Vi kom att samarbeta där och när jag bildade ett eget bolag Cirrus Consulting fortsatte vårt samarbete. Detta på ett än tätare sätt från år 1991, då Per-Simon behövde en legal enhet för omfattande arbeten med nykonstruktion av matare till världens största radioteleskop i Arecibo på Puerto Rico.
Då Per-Simon var ny i Sverige, fortsatte vårt samarbete och kom att omfatta även en del personliga ting. Per-Simons teoretiska och praktiska talanger var imponerande och jag fick förmånen att utnyttja hans teorier i antennkonstruktioner för bl.a. väderradar och hans hjälpsamhet vid genomförandet av mätningar på nya radartillämpningar, som än idag är banbrytande.
Jag bifogar ett litet vykort som Per-Simon sände mig från rån Arecibo och som fortfarande, efter 15 år, sitter över mitt skrivbord. Detta minner mig om en fantastisk vetenskapsman, ingenjör och vän!

Sergei Skobelev, Radiofizika, Moscow, Russia
Dear Colleagues,
I cooperated with Per-Simon in 1990s and early 2000s in the area of hard horn antennas and arrays, and I always remember that our cooperation with gratitude for such positive experience. During that period and in the subsequent years we sometimes disagreed with each other on some professional issues but our disputes were just working moments that helped us to understand the problems deeper. I always was glad to meet Per-Simon at numerous conferences and talk to him. Per Simon was a great scientist whose works I referenced many times, but I also remember him just as a very nice person. He was always open, optimistic, with good sense of humor. This is irretrievable loss for us all. I express my deepest condolences to Per-Simon’s family and wishes to find strengths to survive the dolour.

Koichi Ito, Chiba University, Japan
I would like to offer my deepest condolences to Per-Simon's family, friends and colleagues.
We had lunch together on the first day of EuCAP2016 in Davos. Nobody at the table realized that was the last conversation with Per-Simon.
One of my unforgettable memories of Per-Simon is the Chase Workshop in October 2010. He kindly invited me to give a talk at the Workshop and to visit his laboratory. That was my first visit to Gothenburg. The second visit was EuCAP2013 chaired by Per-Simon. There will be a conference in Gothenburg in March 2017, and if I can attend it, I would like to visit and say goodbye to Per-Simon.

Your friends in Chase – Chalmers Antenna Systems VINN Excellence Centre
Through Staffan Sjödin, Paul Häyhänen, Jan Carlsson
It was a huge shock for all of us to hear the sad news of Per-Simon's tragic death. He initiated and was the main driver of the application for the Chalmers Antenna Systems VINN Excellence Centre (Chase) which started in 2007 with funding from Vinnova, participating companies and Chalmers. Chase has been a very big success with excellent evaluations by international experts and has contributed to the success of the participating companies. Per-Simon was an important contributor to this success, and for that we are very grateful. Rest in peace Per-Simon, your legacy will live forever. On behalf of all members of Chase, our deepest condolences to your family and friends.

Cecilia Marasini, RHEA for ESA - European Space Agency
It's a pity to loose a great professor and educator first as well as a man with a joyful personality. As meeting him in first years of my academic career as along the last conference few days ago, I have always appreciate his positive and founded attitude.
My sincere condolences to his family.

On behalf of the Antennas and Propagation Group of Instituto de Telecomunicações, University of Lisbon, Portugal
Our group was deeply saddened by the news of the loss of Prof Per-Simon Kildal. We want to express our sincere condolences to the family, friends and colleagues. His exemplary contributions for the Antenna field will last.
Carlos Fernandes, Afonso Barbosa, Custódio Peixeiro, António Moreira, Jorge Costa

Kees van 't Klooster
It is difficult to realize the sudden loss of such a person as Per Simon. We had some soft and hard discussions over 30 years, be it in antenna workshops at Estec or in technical activities. I recall how we tried to verify the reliability of databases in Salt Lake City, searching for family ancestors. I wish the family Kildal a lot of strength and would like to pass my condoleances with this loss.

Per H. Lehne, Telenor Research, Norway
I met Per-Simon for the first time when I was a Master student in Trondheim in the late 1980s. He was already then a reputed antenna scientist, and I was considering to do my Master under his supervision. This did not happen, and it took many years before I met him again. The last years I had the pleasure of working with him through the Chase Centre at Chalmers. I had just arrived at the EuCAP in Davos when I heard that he had been taken to hospital, but at the time I was still optimistic about his recovery. The message that he was gone came as a shock to me. I will continue to work with his colleagues at Chalmers and honour his memory in that way. Per-Simon was one of these persons who not only was an innovative and brilliant scientist, but also very warm and inclusive towards other people. I will surely miss him very much. My thoughts now goes to his family in these difficult times.

Lars Granbom, CSO, Gapwaves AB
The first time I met Per-Simon was in the 90-ties. I was responsible for a company called Viking Microwave and we needed a 120 cm parabolic antenna, we bought a HAT-antenna, which was an invention by Per-Simon and later became a huge success with more than one million units shipped. During a meeting a few years later, he told me and one of my colleagues about a new measurement method using some kind of multi-path chamber, but we didn't understand the greatness of this invention. Now we all know that Bluetest is a great success and the chambers are used by all major manufacturers of mobile phones. So when Per-Simon asked me to be a board member in Kildal Antenn I was very honored. Since then I have worked with Per-Simon with different tasks. Currently I am working with sales activities in Gapwaves, which is a very stimulating and creative task.
Per-Simon has been a very good teacher, boss and colleague of mine, and I have had much enjoyment in working closely with him. It has not always been easy, but the deep knowledge and sharp intellect Per-Simon stood for guaranteed that it was a very rewarding and exciting time.
When I first heard that he was suddenly very ill, I was worried, but I was hoping that he would recover, although I knew it would take time. So, when I last week was told that Per-Simon had left us, I got a shock. I find it hard to find words, but of course, my thoughts goes to Per-Simons family. I, personally, will always remember Per-Simon as a very intelligent, kind friend who had and has an important place in my life.
Per-Simon, rest in peace!

Hideki Kirino, WGR Co., Ltd., Japan
The sudden knowing of Prof. Kildal passed away is my great shock. He gave me the first and more chances to attend EuCAPs which directed my present work and life. Every time I met him, he cared my doctor challenge going. Furthermore he gave me a partnership in developing Gapwaveguide technology and academic researches. ISAP2015 in Tasmania was the last time to talk with him, where he also gave me kind consideration for my work and researches.
My sincere condolence goes out to his family and pray God give a great sympathy to him. Indeed I'm very sorry I notice again to myself this is the last mail to him.

Prof. Guy A. E. Vandenbosch, Dep. of Electrical Engineering, KU Leuven, Belgium
Dear Per-Simon,  dear friend,
We know each other for almost 30 years ... and yes, my mind knows since last Friday ... but my heart and soul are starting to realize only now that you are not in this world any more. My next trip to Gothenborg will not be the same ... no more scientific discussions ... no more "me teasing you" about the fact that you are "not always a very easy man to deal with", after which you always got a big smile on your face ... The truth of the matter is that I really admire this quality ... even up to a level that many times, when things got a bit rough with the colleagues at the department, I wondered how you would deal with the problem I was facing. You know I respect you very much, that I have told you, but not this. Is it pride ... a human characteristic that we both share ...
maybe ...
Success was yours during the last 10 years, but I remember a conversation that we had about 15 years ago, at a COST meeting, sitting in a bus next to each other. You conveyed me that things were not going that well with your group ... But you are a fighter, and the spirit you showed during that conversation became reality. The antenna group flourished again and is now considered as one of the most successful worldwide. Also that is you ... never give up ...
In the week after EuCAP, I was hoping that you could also win this fight ... but reality turned differently ..
I will miss you Per-Simon, I really will ... rest in peace ...

Austin S. Kim & Samsung Mobile Antenna R&D Group members
We are truly sorry to hear of the loss of Prof. Per-Simon Kildal, a renowned researcher and a distinguished professor in the Antennas and Electromagnetics. Our deepest sympathies go out to you and your family in this difficult time.
It was a joy to have known such a great person and to have had chances to discuss many challenging problems with him. We will truly miss Prof. Kildal, who will never be forgotten in our memories.
May his soul rest in peace.

Prof. Thomas Kürner, Institut für Nachrichtentechnik, Technische Universität Braunschweig, Germany
When I heard about the sad news I was shocked. After the  opening session at EuCAP in Davos, I  had a good discussion with Per Simon about channel modeling and in the afternoon of that day, I attended his daughter Madeleine's  interesting talk, which was about the topic we discussed. I could not imagine that this discussion should be my last contact with Per Simon.
I send my warmest condolences to Per Simon's family and friends. All the best in these difficult days and weeks.

Kathleen Melde, Professor, ECE, University of Arizona, USA
It with great sadness that we heard about Per Simon’s sudden passing here in the States. In my opinion, he was a true pioneer of innovation and ideas. We first met in the early 1990s at the APS conference in Michigan. It was my first APS conference. Per Simon was talking with my advisor, Yahya Rahmat-Samii and I came up to them to ask about the terms hard and soft surfaces. Yahya was covering Dirichelet and Neumann boundary conditions in class. Per Simon was delighted with the question and gave a nice answer (to a young student). To this day, I still explain to the future generation the concept. Although some of the text books may mention it in passing… it is important that the history and the legacy of ideas be handed down to the new generation of thinkers.
Per Simon was always full of enthusiasm about what someone is working on and new ideas. I recall when he wrote his paper about “EM Wave Suppression using a Bed of Nails,” he sent me a copy, since I had done some similar work. One thing I find intriguing about our field is  the  concept of “What’s in a Name?”  and the concept about when ideas really are ready to be adopted by the greater society. Today, the terms metamaterials and metasurfaces are sticking and have struck a unique chord with our community. Yet, the concept of hard and soft surfaces (coined by Per Simon) has similar roots. When Per Simon received the APS Distinguished Achievement award, I recall his excitement and his daughters being in attendance. In his acceptance, he really wanted to thank those who influenced the contributions. He really wanted to deliver the message and the historic significance of the overall contributions.
In the last year, I have heard about all of the most wonderful people he has mentored and supported. In many ways. In this light, his pioneering work goes way beyond technical contributions…… but instilling in others a true pioneering spirit. This is truly a unique gift and legacy to all of us. Your presence will indeed be missed, but the ideas and graciousness you have given us live on for generations.

Bertram Arbesser-Rastburg,   Senior Advisor, SpaceTec Partners
Per-Simon passed away well before his time. We lost an inspiring tutor, a visionary, an inventor and an entrepreneur. But most of all - we lost a friend! My sincere condolences to his family!

Prof. Juan R. Mosig, Director, Laboratory of Electromagnetics and Antennas (LEMA), Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland
My first recollections of Per-Simon go back to the early nineties when he became a Professor in Chalmers and we were partners in several European COST Actions. Our interaction grew up continuously and I have in particular fond memories of a COST-273/284 joint meeting in Gothenburg , that Per-Simon co-organized with his Chalmers colleague Arne Svensson. This was a perfect opportunity to experience the warmth, energetic and life-loving qualities of Per-Simon.
We co-organized together European School of Antennas courses in Lausanne twice in 2006 and 2008, and he was the Chair of the EuCAP’2013 Conference that he flawlessly organized in Gothenburg in April 2013.  All these opportunities, and some encounters in far-away places like ISAP conferences in Japan, created a strong feeling of friendship between us, that we happily nurtured.
I always admired the ability of Per-Simon to excel in so many different areas: A highly esteemed researcher, whose forages on electromagnetic softwares and innovative waveguiding structures will continue to inspire many of us; An excellent teacher, author of a reference book in our antenna domain; The creator of several successful start-ups, like BlueTest and GapWaves; The manager and leader of an outstanding research group at Chalmers University, CHASE.
A few weeks ago, during the EuCAP’2016 Conference in Davos, Switzerland, I had asked all the past EuCAP Chairs to participate in the Opening Session. Per-Simon was there and he received a well-deserved ovation. None could imagine that this was to be the last ovation by his friends and colleagues and that the cruel Fate would stroke him a few hours later.
Per-Simon was a living example among us and his example will remain with us.
All my condolences to his family

Saliga äro de som sörja, ty de skola bliva tröstade.

Prof. Dr. Matthias Geissler, Head of Antennas & EM Modelling, IMST GmbH, Germany
Dear family of Per-Simon, dear friends, dear colleagues,
Here at IMST, we are all shocked by this sad news. Per-Simon will be dearly missed but he will stay in our memories, especially the many talks, discussions and his sense for humour. He will not only be missed as a colleague, but also as an adviser, mentor and, most of all, a good friend within the antenna community.
The antenna team of IMST

Prof. Yihua Yan, President of IAU Division E: Sun & Heliosphere , National Astronomical Observatories, Chinese Academy of Sciences 
It was with great shock that I learnt the news about Prof. P. -S. Kildal's death. Please accept my heartfelt sympathy on the loss of Prof. Kildal.
I got to know his name about 2 decades ago when I was in radio astronomy group at Beijing Astronomical Observatory for promoting the  LT project (now SKA). For Chinese concept of SKA, the proposed prototype was an Arecibo-type telescope with 500-m aperture, or current FAST under construction. I learnt that Prof. Kildal designed the secondary and tierary reflectors to replace the line feed of Arecibo antenna, which was also one target then for FAST design on how to get rid of the line feed. I knew Prof. Kildal visited Beijing then and was very helpful to the LT group at BAO.
Later I moved to Solar Radio Astronomy Group of NAOC and once I visited Chalmers to consulted him for the eleven feeds for Chinese Spectral Radioheliograph. Since then I have met him several times and he showed very good personality. He was an extraordinary figure who will live in our heart!
I sincerely condole with his family over the death of Prof. P.-S. Kildal.
Sincerely yours,

Anton Tijhuis, Professor of Electromagnetics, Eindhoven of Technology, Eindhoven, the Netherlands
Dear Per-Simon
Your scientific contributions will be remembered for years to come by the antenna and applied electromagnetics communities. However, we will miss you even more as a person. You were a true leader, uniquely able to identify developments in our field and to inspire students and young scientists. I fondly remember the recent visit by Rob Maaskant and yourself to Eindhoven and the discussions that we had at that time.
On behalf of all members of the Electromagnetics Group I send our  warmest condolences to Per-Simon’s family. He will be truly missed.

Alireza Motevasselian (PhD), Senior Antenna Designer, Leax Arkivator Telecom, Sweden
It is deeply sad to lose such a talented professor, great presenter, extremely wise, full of new ideas, encouraging and friendly who was radiating confidence, wisdom and hope!
Rest in peace Per-Simon! You will be greatly missed!

Prof. Cyril Luxey - University Nice-Sophia Antipolis, France
Thank you SO MUCH for all the scientific and non-scientific moments we shared. Rest in piece my dear friend.

Your friends at Huawei Technologies Sweden AB in Gothenburg office
Mats Högberg, Mattias Gustafsson, Tommi Jämsä, Jocelyn Aulin, Martin Alm, Rajet Krishnan, Mats Alexanderson
Dear Per-Simon,
You will always be a source of inspiration for us with your positive attitude and energy to create, explore and drive new ideas to real products. It has been a pleasure to work with you and it has enriched our knowledge about antennas and innovations. It’s a tragedy that you have to leave us so early. We will keep your memory with us.
To Per-Simons’ family, we give our deepest condolences.

Dinh Tran, Delft University
All our best thoughts and prayers to Prof. Per-Simon Kildal and his family.

Ali Razavi, Assistant professor, Graduate University of Advanced Technology, Kerman, Iran
I got in contact with Per-Simon from 2013 as a visitor. I saw him always debonair and hardworking. I learned many things from him and he will remain in my heart for ever.
Rest in peace Dear Per-Simon and my sincere condolences to your family and friends.

Sofia Rahiminejad, PhD student, Chalmers University of Technology
Dear Per-Simon,
Last time we spoke, I held your hand and said everything would be alright. You said you were glad I was there. When the ambulance came, you joked, we smiled and said good bye. I really believed that everything would be alright. I still can’t believe what happened. I will always remember you smiling. My deepest condolences to his family and friends.

Mariano Baquero
I want to move my deepest condolences to all family and friends of Professor Per-Simon Kildal. It has been  a huge loss. From Valencia (Spain) we were lucky to meet him a few years ago and maintain a fruitful research collaboration with him. May he rest in peace and may God welcome him in her womb.

Dr. Jungang Yin, Hunan University, China., visiting Ph.D. student 2006-2009
To whom it may concern,
I felt suddenly and deeply sad to hear his untimely passing away when I talked with Jian Yang at S2 over an internet call the other day. When I got the official condolence information this morning, I am writing at once to express my sorrow and sympathy. He was really a great man and a most important mentor in my career, always encouraging and supportive and helped me a lot in many ways. I work now in a university in China, and his textbook about antennas has become popular among my students. His legends will be spread and he will be greatly missed by all who knew him across the world.
Please convey profound condolences to Kildal's family. Rest in peace, dear Per-Simon.

Shogo Etoh, Microwave factory Company Limited
It was with shock and sadness that the news of Professor Kildal's untimely passing was received by all in Japan who knew of him and his work.
On behalf of both Cornes Technologies Limited and Microwave Factory Company Limited, which has recently started doing business with Kildal Antenna AB, I would like to convey to the family of Professor Kildal and to all his friends and colleagues our deepest sympathies and sincere condolences on their tragic loss.
During the 10 years or so that I knew him personally, Professor Kildal visited Japan a number of times and we met on many occasions both here and in Europe.
He was a man of tremendous energy and hugely respected in his field.  To be taken so soon and so suddenly when he still had so much more to give is a great regret for us all and he will be sorely missed.

Thomas A. Milligan, AP/S President, 2000  & Mary W. Milligan, Milligan & Associates, Inc.
It was with heavy hearts that we learned of Per-Simon's passing.  Our deepest sympathies go to his family in this terribly sad time. For his colleagues, this loss is devastating as well. Whenever we met Per-Simon he was engaging and full of the joy of life, happy to be doing work he loved.  That joyful man is the one we will remember.  Rest in peace, Per-Simon.

Ali Farahbakhsh, Assistant Perofessor, University of Kerman, Iran
Davoud Zarifi, Assistant Perofessor, University of Kashan, Iran
The day before the conference, we met Per-Simon when he was skiing; he was smiley, energetic and strong, just like always. We still cannot believe Per-Simon left us suddenly. He taught us a lot of thing; science, morality and politeness.  We will never forget him and he is always in our hearts. Our sincere sympathies and condolences to his family and friends.

The last photo with Per-Simon at Davos Parsenn.

Adjunct Professor Jan Carlsson, SP Technical Research Institute of Sweden
Dear Per-Simon,
I cannot understand that you have left us so early, you had so much more to give and so many plans for the future. For me, you were more than a mentor and colleague, you were a dear friend for more than 25 years. You will be deeply missed but your memory will be kept in my heart forever. Thanks for everything Per-Simon, may you rest in peace. My thoughts and deepest condolences go to your beloved Cécile, Madeleine and Susanne.

Zhinong Ying, Sony Distinguished Engineer, Network Technology Lab., Sony Mobile Communications
It was a huge shock for me to hear the sad news of Per-Simon's pass away, I did not thought his health have any big problem during the whole conference, just need a rest.  He is an energetic person, and restless to work year to year. I worked on “Soft and hard surface in EM” under his guidance earlier years, and later on collaboration in Chase on the mobile antennas and OTA test methods. It is a big loss in Chalmers and Swedish antenna domain. Send my condolences to his family. I hope Per-Simon rest in peace, you will always be with us.

Rana Arslan Ali Khan, Lead Researcher, Microwave Systems Lab., Prince Sultan Advanced Technology Research Institute, King Saud University
My heart felt condolences for the family and loved ones of Prof. Kildal on this sad occasion. Prof. Per-Simon Kildal was a great teacher, passionate researcher and an amazing person. I treasure my time I spent at his research centre under his supervision. May his soul rest in peace.

Claes Beckman, Director Wireless@KTH and Board Member Allgon AB
It was with great sadness I learned that Per-Simon had suddenly passed away. I first met with Per-Simon as a PhD student at Chalmers when he arrived as the new antenna professor. When I started to work for the antenna company Allgon he was always supportive and shared so much of his understanding of antennas to me and my colleagues. Later when I become a college professor in Gävle he continued to help and support me and my students, e.g. by coming to Gävle to visit and giving a seminar.
Through my engagement in the EISCAT 3D project I recently had the opportunity to study Per-Simon’s early work and I doubt that the world will ever see a more creative antenna engineer.
My deepest condolences to his family.

Eva Rajo, University Carlos III of Madrid, Spain
My dear Per-Simon, in the darkness of these days, I try to find your light to guide me in the middle of the pain and emptiness that I feel. I was immensely lucky to share so much time of my life with you. You changed my life forever. You taught me the most important lesson: to enjoy life and to enjoy work, to believe in your dreams, to fight when needed. I learnt how working hard and laughing loud are not incompatible. You were no doubt, one of the happiest persons I have ever known. Your life full of love and passion is an inspiration and a model for me. You were family for me and I will miss you forever, but you will be always in my heart and you will accompany me the rest of my life. To your lovely family, Cécile, Madeleine and Susanne, my deepest condolences from the bottom of my heart.

Reto Branschi, CEO Destination Davos Klosters / Davos Congress
Dear Mr. Svenson
Dear family Kildal
We had the honour to welcome Professor Kildal as a speaker at the European Conference on Antennas and Propagation in Davos. Professor Kildal’s sudden death has shocked and sadden us. It is with deep regret that all my staff from Davos Congress and I send our condolences on the loss of Professor Kildal.
There is very little one can say at a time like this, but all of us, the staff and the officials of Davos, would like to extend our sincere sympathy.
Reto Branschi

Dr. Mouhamed Abdulla, Communication Systems Group, Chalmers University of Technology, Sweden:
The loss of Prof. Per-Simon Kildal came as a shock to everyone, particularly to Chalmers S2. I personally did not work with him, but I had the pleasure of interacting with Per-Simon during Lunch/Fika. Not seeing him around the office will certainly be very hard to all of us at Chalmers S2. He will deeply be missed. My sincere thoughts are with his family, colleagues worldwide, and his past/current students. RIP Per-Simon.

Alhassan Aljarosha, Graduated MSc student, Chalmers University of Technology, Department of Signals and Systems
I find myself incapable to describe my feeling, missing such a person is a big loss. I will never forget our discussions and your advices, you are a great advisor Per-Simon!
You are always in our hearts, I will never forget the image of your gentle and bright face.
My sincere sympathies and condolences go out to your family.

Dr. Rostyslav Dubrovka, Antennas and Electromagnetics Group, Queen Mary University of London
Dear Family
Please, accept my deepest sympathy and my condolences on your loss
Yours Sincerely,
Rostyslav Dubrovka

Hasan Raza, General Manager, DESTO, Pakistan
It is very hard to believe that Per-Simon has left us so early. I spent almost five years in his research group. Those five years have changed my life. He was a brilliant researcher and his scientific contributions were milestones.
Than you Per-Simon for every thing you have done for me. I will really miss you. My deepest condolences to Cécile, Madeleine and Susanne.

Dr. Yogesh Karandikar, Antenna, RF/ Microwave Consultant, Tantrayut Telecommunications Pvt. Ltd., India
I simply couldn't imagine that he is no more. In past 10 years by some means or other, I was involved with Prof. Kildal's activities with Eleven feed and its very hard to digest that he is not with us. However, the knowledge I received about reflector antennas from him, will stay with me forever. Its for sure a big loss for antenna community and also to Chalmers.
Deepest condolences to Cécile, Madeleine and Susanne.
Regards, Yogesh Karandikar, Phd Student with PSK 2007-2009

Sheila Galt, bitr. prof., Avd för Fotonik, Inst för Mikroteknologi och nanovetenskap, Chalmers
In memory of Per-Simon
My first memory of Per-Simon was a warm hug when welcoming him to Chalmers. We had many meaningful discussions about learning, leadership and ethics. I remember him as a highly ambitious man who always meant well, and sometimes was caught up in uncomfortable misunderstandings. It was a growing experience for us both, when he gave me the chance to help guide him through some troublesome times, many years back. It is with a sad heart I realize that I never will be able to thank him properly for those discussions, and the friendship they lead to. I must instead, send a warm hug to his family at this difficult time.
Sheila Galt, former colleague at Chalmers

Juraj Bartolic, University of Zagreb
This is tragic news and a tremendous loss. A Golden heart stopped beating. For many of us, Per-Simon will be remembered for his brilliant scientific achievements and success but will miss him mostly for his honesty, enthusiasm, goodness and friendship. I had the privilege to experience all of these. Farewell dear friend. My deepest condolences to Cécile, Madeleine and Susanne.

Prof. Fernando Las-Heras, University of Oviedo
I am really sorry;
My most sincere condolences and those of my group at the University of Oviedo to the family and friends, and my great appreciation for the work and friendship of Professor Per-Simon Kildal.
For sure he will remain as a source of inspiration in our community.

Prof. Silvio Hrabar, University of Zagreb, Croatia
Per-Simon was an enthusiast, always trying to push the frontiers of engineering and science. At the same time, he was very helpful colleague and a nice person.  Despite the loss of the physical presence, the memories will never disappear. God rest his soul in peace!

Ioan E. Lager, Faculty of Electrical Engineering, Mathematics and Computer Science, Delft University of Technology
Professor Kildal has marked unmistakably the antenna research. He will be remembered as the researcher always seeking to cross the most far-reaching challenges in the most elegant and logical manner. His inexhaustible intellectual force and insatiable curiosity leave us only speculating on what the future years could have added to his unique scientific record.
But, despite his admirable scientific legacy, my recollections about Per-Simon will primarily concern his luminous personality, his perpetually smiling, relaxed but distinguished appearance. Always ready to give in his soft, melodious voice an advice or an encouragement. I particularly cherish the remembrance of his early 2011 visit to Delft on the occasion of one of my PhD’s defence when, with his prominent scientific stature, he gave an unquestionable validation of the student’s work. At the same time, I shall never forget the discussions we had during the many COST meetings when we had the privilege of having him among the participants.
My thoughts go obviously to his beloved family. Words are poor for offering comfort at such a loss, but please be assured that we have you all in our heart.
May he rest in peace and may his memory never fade away!

Gabriele Gradoni, School of Mathematical Sciences & George Green Institute for Electromagnetics Research, University of Nottingham
This is really sad and a great loss to all of us. I remember the exciting discussions that I had few years ago with Per-Simon about statistical physics approaches for complex cavities, as well as his pioneering work in antenna and metasurface design. Lately, he did amazing and innovative work to bridge the gap between wireless communications and statistical electromagnetics - including the us of reverberation chambers to emulate multipath fading.

Dr. Jussi Rahola, CEO, Optenni Ltd, Finland
It was a huge shock for me to hear the sad news of Per-Simon's tragic death. I've know Per-Simon since around 2000 and I'll always remember him for his energy, humor and professional excellence. We've had such cheerful moments together at various COST meetings and antenna conferences. It is a great loss for the antenna community to lose such a central and active person in this area. My deepest condolences to his family and colleagues at Chalmers and Bluetest.

Giuseppe Di Massa, Full Professor of Electromagnetic Waves, Dipartimento di Ingegneria Informatica, Modellistica, Elettronica e Sistemistica Università della Calabria
My deepest condolences to Per-Simon's family, friends and colleagues.
We lost a brilliant scientist, an innovator plenty of brilliant ideas, a simple and friendly person.
Per-Simon, may you rest in peace.
Dr. Jussi Saily, VTT Technical Research Centre of Finland
I would like to offer my deepest condolences to Per-Simon’s family and colleagues. Your legacy will continue and you will not be forgotten.
Zvonimir Sipus, University of Zagreb, Croatia
Dear Per-Simon,
You have marked our lives in so many ways. You have been an inspiring person for so many researchers and students. For me, you have been such a good friend also. You will always be with us. May you rest in peace.  My sincere condolences to Cécile, Madeleine and Susanne.
Prof Stefano Maci, University of Siena
On behalf of the European School of Antennas community, and on my personal side, I wish to express our condolences for the terrible loss have afflicted the Per-Simon’s family.
Per Simon was a pillar of ESoA, and enormously appreciated by students and colleagues.  In response to my message giving the sad news that Per Simon has passed away so prematurely, I have received many moving messages of astonishment, sadness, and sympathy  from all the ESoA friends. The terms most used have been "great person", "giant of our community", “visionary scientist”, “outstanding educator”, ”great friend”. Everybody has been sincerely touched and deeply moved. If our community has lost an outstanding scientist, and the majority of my ESoA colleagues has lost a friend, I have lost a brother. I have known Per Simon for 26 years. All along these years we have collaborated and visited our respective Universities several times, we have held together many short courses and published together many articles. He was a kind, deeply honest and ethical person. His disappearance has left me empty and devastated by deep grief. Cécile, Madeleine, Susanne: Grazia and I are close to you in this terrible moment. You should be proud of what Per Simon has done during his life. From the bottom of our hearts we will do our best to keep his memory alive.
Johan Lassing
Our deepest condolences to Per-Simon's family, friends and colleagues. We will miss your energy and passion about science and entrepreneurship. Your ability to spread your knowledge into fruitful companies is an inspiration to all of us. We will try to continue on some of the journeys that you started, in your spirit. Gothenburg has lost one of its greatest entrepreneurs and you will be deeply missed.
The friends at Qamcom Research & Technology
Cyril Mangenot on behalf of EurAAP and Juan Mosig on behalf of the EuCAP 2016 organizing committee
 In Memorian of Prof. Per-Simon Kildal
Our association EurAAP is deeply saddened by the loss of Prof. Per-Simon Kildal. As professor in the Department of Signals and Systems of the Chalmers University of Technology, Gothenburg, Sweden, Per-Simon Kildal was involved from the beginning in the construction and development of EurAAP.  He organized co-organized and participated in many courses of the European School of Antennas (ESoA) and he was a strong supporter of the EuCAP Conferences since their creation, being in particular the chairman and organiser of the 2013 edition held in Gothenburg, Sweden. His memory will always remain alive among us.
Elena Pucci, Ericsson, Stockholm
Per-Simon has been my supervisor during my PhD studies at Chalmers for five years. I still hesitate to believe that he is not anymore among us and the grief of this loss is overwhelming. My deepest condolences go to his family, may our words help confort them. We have lost an amazing person and an excellent scientist who loved his work with so much passion and enthusiasm, that has always been a source of inspiration for me. I will never forget all the nice moments spent together: the time at Chalmers, our meetings, the ski trips with the group, the conferences, the Christmas tables…I will always keep the image of him smiling and full of life. He was never giving up in his believes and could always see one step further than the others.  Once Per-Simon read us the following lines, I would like to dedicate these in his memory: « Here’s to the crazy ones. The ones who see things differently. While some may see them as the crazy ones, we see genius. Because the people who are crazy enough to think they can change the world, are the ones who do. » Thanks Per-Simon for having changed our world and influenced our lives. I feel so lucky to have had the opportunity to know you.

Magdalena Salazar Palmaetics, Charles the Third University of Madrid
Sad news! My sincere condolences to his family
Ashraf Uz Zaman, Assistant Professor, Department of Signals & Systems
Finding the right words to express feelings under such circumstances is extremely difficult for me. I had been working with him for last eight years. I used to sit just beside his room. We were both early morning guys.
It was either me or him in the whole corridor early morning. Over the last eight years, my working days used to start either me saying good morning to him or he saying good morning to me. I was so used to that. This Monday I realized this is not going to happen again. I can say only one thing, I have only good memories working with you over the last 8 years.  You always had a great believe on me. Also you  inspired me a lot through all our daily discussions during lunch or coffee breaks. You were a great example of scientific rigour and knowledge.  You left us very early Per-Simon. You will be with us in our hearts, your legacy will not end here. My deepest condolences to the family and friends in this very difficult time.


Dr. Alessia Polemi, Research Professor Drexel University (USA), Assistant Professor University of Modena (Italy)
Dear Per-Simon,
I will always remember you with a smile on your face. You were kind, gentle, and a very rigorous scientist whom I am proud to have worked with. You will continue to be with us, your legacy will not end here.
My sincere condolences to your family and friends.

Dr. Giuseppe Ruvio, Research Fellow, Antenna & High Frequency Research Centre, Ireland
My deepest condolences to Per-Simon's family, friends and colleagues. This is a huge loss for our scientific community. Per-Simon was the supervisor of my Masters thesis and since then a great example of scientific rigour and knowledge. I enjoyed each discussion and laugh we had together. My grief is only consoled by the thought of the enduring memory he left in hundreds of students and colleagues had the privilege to meet him.

Abolfazl Haddadi, PhD, AmirKabir University, Iran
His kind face remains forever in my image.
I will never forget my last walking with Per-Simon, the day before his surgery. I remember his eagerness about the proposals that he was working on. What a great guider! He was also happy that he will meet his lovely Madeleine, and they will go for skiing. What a great father and skier!
You did a good job, Per-Simon! You, tireless man!  Now it is time to rest in peace. My deepest condolences to family and colleagues.

Professor Ronan SAULEAU, IETR, Université de Rennes 1, France
I would like to express my deepest condoleances to Per-Simon's wife and family, friends, and collaborators not only from Chalmers University but also from all over the world where Per-Simon had strong connections.
Finding the right words to express my feeling under such circumstances is extremely difficult, even impossible. I had the privilege to tightly interact with Per-Simon over the last 10 years. He was so passionante, friendly and always available. We lost a brilliant scientist, an entrepreneur with plenty of brilliant ideas and an example to follow for our community.  Per-Simon, may you rest in peace.

On behalf of the TICRA staff - Knud Pontoppidan and Poul Erik Frandsen
Dear colleagues at Chalmers Antenna Systems –
the sad News of Per-Simon Kildal’s untimely passing away has hit us all. Many of us have known Per-Simon for many, many years and respected him as an excellent scientist, engineer, leader and dedicated and highly reliable partner.
But equally, his open and friendly personality and good humor made it easy and pleasant to interact with him. We wish Per-Simon’s family and you all at the department the strength to cope with this loss and we will keep Per-Simon in our memories.

Andrés Alayón Glazunov, Antenna Systems Division, Chalmers University of Technology
I first met Per-Simon fifteen years ago or so; and it was of course related to antennas and OTA activities. However, our main collaboration started just two years ago when I applied for the advertised new position at the Antenna System Division at Chalmers. From the beginning he stroke me by his strong believe in his own ideas and the clear vision for research goals. During these years his positive attitude towards work, students and colleagues has been a source of inspiration. He was a true leader, capable of engaging everyone around him towards a common goal. He was a unifying force. As the good research leader he was, he was receptive to new ideas too. As a scientist, Per-Simon had a keen understanding of physical principles behind electromagnetic wave propagation phenomena. He sought to simplify as much as possible in his research, while enlightening the quintessence of the problem at hand. To me, Per-Simon was the great practical scientist who approached research, teaching and life with unlimited creativity and enthusiasm.
Many thanks Per-Simon for your mentoring and friendship. I will always remember the good loud laughs at our meetings and the feeling that everything is possible. Rest in peace Per-Simon.
My deepest condolences to Per-Simon’s colleagues, friends and family, especially Madeleine.

Ett strävsamt liv har slocknat ut,
en flitig hand har domnat.
Din långa arbetsdag är slut,
ditt trötta hjärta tystnat.

Buon Kiong Lau (Vincent), Lund University, Sweden
I have had the privilege of knowing our dear friend Per-Simon for many years. Being located not far from Chalmers and having some common research interests, I have enjoyed interacting with him on a regular basis, including giving guest lectures at his PhD courses and sitting in the examination committees of several of his PhD students. His endless enthusiasm and energy in his research endeavors and initiatives has been an inspiration to me and many others, and Sweden has indeed lost its Giant in antenna research. As much as it is heart-breaking to accept his premature passing, I would like to remember Per-Simon as someone who thoroughly enjoyed what he was doing, truly believed in what he was doing and accomplished a great deal through he was doing. Thank you, Per-Simon… My deepest condolences to his family and friends in this very difficult time.

Ahmed Kishk, Concordia University, Montreal Canada
The last moment I saw Per-Simon when he was carried to the hospital. I still see him smiling and waving his hand to me. I waved to him with a smile. I did not think it was the final goodbye. I knew Per-Simon for 32 years. I worked with him during my sabbatical leaves twice for one year each. I am deeply saddened by his leave, but he will continue with us through his contribution to our society for years to come. My sincere condolences to Cécile, Madeleine and Susanne. Per-Simon rest in peace, you will always be with us.
Marta Martínez-Vázquez, IMST GmbH
Dear family Kildal, dear colleagues and friends of Per-Simon,
It is with great sorrow that I learned of Per-Simon’s untimely death. I cannot find the words to express what I want to share with his family and colleagues in such a terrible moment. Although words are hollow in such circumstances, I wish to assure you of my deepest sympathy. Professionally, Per-Simon was a giant. He accomplished so much in his long academic life. He was a scientist, an educator, an example for us all. His scientific work will outlive him.
And what can I say about Per-Simon as a person? I have known him for over 15 years, through different projects and COST Actions. He was so passionate and full of life! Always cheerful, always smiling, always full of projects... I will always remember Per-Simon as I saw him for the last time in Davos: enjoying life, happy to share a wonderful day with one of the daughters he so much loved and of whom he was so very proud. I would like to express my support and my affection to his wife, his daughters, his friends and all his colleagues at Chalmers. I know he will be greatly missed by all who knew him. Please accept my heartfelt condolences.
Alain Sibille, Professor, Telecom ParisTech, France
My thoughts go to Per-Simon, with whom I have been actively collaborating in the context of EuCAP and other scientific animation or evaluation duties in the recent years. His abrupt disappearance is a shock to all those who knew his energy, vitality, enthusiasm, charism and efficiency in professional activities. I wish his family and his relatives, colleagues and friends  much courage to surmount this terrible event.
Arnold van Ardenne, former Adjunct Professor at Chalmers and former ASTRON R&D Director.
Over so many years, it has truly been a pleasure to work with you and to enjoy your creative and energetic personality. It is sad and schocking that all the fruits of your work cannot be reaped anymore by you and family. Our memories and the many professional contributions you made will last. 
Jonas Flygare, Project Assistant, Earth and Space Sciences, Antenna and Receiver Development at Onsala Space Observatory
My deepest condolences to Per-Simon's family and friends for this terrible and shocking loss. I keep you in my heart and thought at this trying time. Per-Simon inspired many people, including myself, through his character and ambition. You gave me the opportunity to work for you and guided me into the world of antennas, and for this trust I will be forever grateful. May he rest in peace.
Björn Lindmark, Filtronic Wireless AB
It was with great sadness I learned of Per-Simon’s sudden passing. I have known Per-Simon since my M.Sc. thesis work in 1994 and subsequent Ph.D. studies in the antenna group. I will remember Per-Simon most for his enthusiasm and relentless drive to pursue his ideas. A true researcher of new technology, always with a smile on his face! My deepest condolences to family and colleagues in these sad times. Bart Smolders, Dean of the department of Electrical Engineering, Eindhoven University of Technology, and Chairman IEEE Benelux section
The antenna team at TU Eindhoven, The Netherlands, was really shocked by the news of Per Simon.
He has been one of the leading antenna experts worldwide. Next to this, Per Simon had a very warm and friendly personality.
My deepest condolences to family, colleagues and friends.

Roberto Graglia, 2015 IEEE AP-S President
We all were shocked by the news. My deep condolences and those of my group working at the Politecnico di Torino to Per-Simon family, his dear ones, and to all his colleagues.
He was a very good man and a first class scientist, and our community will miss him a lot.

Omid Sotoudeh, PhD , Radar and optronic sensors, Systems Engineering, Business Area Dynamics, Linköping, Sweden
Dear Per-Simon,
You have been a strong and inspiring person for so many students and researchers. You have always been a good friend and mentor. We had a good laugh last I met you here in Linköping.  Our deepest condolences to your family.

Filiberto Bilotti – President of the METAMORPHOSE VI
On behalf of the METAMORPHOSE community, I wish to express my sincere condolences to the family and the friends of Per-Simon. He was a great scientist and will continue inspiring our work. Rest in peace.

Dr. Michael Thiel, Head of Antenna Development, Radio Frequency Division (RF), HUBER+SUHNER AG
Dear family Kildal, dear colleagues and friends of Prof. Kildal,
I want to express my deepest condolences to you, I am deeply sorry about this very sad moment. I knew Prof. Kildal since many years and always was full of respect with regards to his contributions in the antenna society and especially his personality. Throughout the recent years, I was always attending his sessions about mmW on EuCAP. Such nice discussions and always full of live and true enthusiasm for this field of research. I could meet Prof. Kildal for the first time during the European Workshops on Conformal Antennas, of which one was hosted in Gothenburg as well. For me it was a great pleasure and honor to meet Prof. Kildal for the first time. One of my most beautiful memories was when we met during a workshop on Conformal Antennas. On the way to our social event in Amsterdam, we sit together during a boat tour and we had some nice chat about antennas. Even more in my mind is the wonderful social talk we had, we were all laughing together and especially I remember Prof. Kildal with his heartful laugh. I am grateful that I could meet Prof. Kildal.
In my thoughts I am with his family and close friends, his colleagues and students. I wish you all much strength in this very difficult time.
Michael Thiel

Prof. Anja K. Skrivervik, EPFL-STI-LEMA, Switzerland
The news of Per-Simon's arrived as a great shock. We have lost a dear friend, a great scientist and a leader of the community. Per-Simon, may you rest in peace.
My sincere condolences to his family

Sänder en medkännande tanke till Per-Simons anhöriga och nära kollegor och beklagar sorgen.
Per Lundgren

Dr. J. R. Sanford, CTO, Ubiquiti Networks
I am deeply saddened by the loss of our friend. Per-Simon’s optimistic and motivated approach had a large impact on me and a number of my friends from Chalmers. I am not sure I ever truly thanked him for the opportunities he provided me. He will be sincerely missed and I will include him and his family in thoughts and prayers.

Prof. Mohammad S. Sharawi, Electrical Engineering Department,  King Fahd University of Petroleum and Minerals (KFUPM), Dhahran, Saudi Arabia
A great loss to the Antennas and Propagation community ... Your work will be a lighthouse for all those eager research ships sailing out there ... your spirit, kindness and great personality will never be forgotten ... It was a pleasure to know you closer and in person through recent years ... Rest in Peace Per-Simon and my Deep condolences to the family ...

Xiaoming Chen, Qamcom Research & Technology
I was Per-Simon’s former student and have known him for more than nine years. I am truly grateful for his guidance and encouragements throughout my years at Chalmers. The sad news came as a shock to me. And I am very sorry for that. May you rest in peace, dear Per-Simon. My deepest condolences to you and your family.

George Eleftheriades, University of Toronto, Canada
I am devastated by this early and unexpected loss of Prof. Kildal. My condolences to his family. He will be greatly missed but his contributions will survive him for many years to come.

Antoine Roederer, Scientific Advisor, Delft University
This is a big shock and a big loss. We have known Per Simon in COST and Estec ever since he moved to Chalmers and even before. He also did not give the impression to be fragile or ever sick. My thoughts go to his family, friends and colleagues. Farewell Per-Simon.

Oscar Quevedo-Teruel, Assistant Professor, KTH Royal Institute of Technology
I express my sincere condolences to the family and close friends of Per-Simon. I will always remember Per-Simon as an enthusiastic and full of energy person. He worked with devotion and passion all his life in a research field that he loved, and he was an inspiration to many people who followed his ideas and values.  Recently, he passed away, but he is still with us, because he left a legacy. A legacy full of brilliant ideas that many others will surely follow; and a legacy of people who were educated by him, and who will follow his values in their own lives; and will transmit those values to future generations. I can say proudly that I was one of his students. Thank you, Per-Simon!

Professor Yang Hao, Antennas and Electromagnetics, University of London, London
This is really a sad news. I had been praying for good outcome after knowing his sickness at Davos.
I visited him recently and gave a CHASE seminar, he reciprocally visited me with his colleagues and gave a seminar in London afterwards. I was planning to have a coffee with him while I had a meeting in Gothenburg during the week before EuCAP, for some reason, we did not make it but promised to see each other in Davos. I am truly saddened to know that our meeting in London was in fact the last one. Professor Kildal was one of my dearest friends. He was truly a profound scientist, an antenna innovator and entrepreneur. He will be solely missed. Please accept my sincere condolence to the family.

Astrid Algaba Brazález, Researcher at Ericsson, Lindholmen
Last Friday I got the shocking and heartbreaking news that our dear Per-Simon left us. I have a huge empty feeling inside myself since then, that brings me into a status of distress and sorrow that still makes me wonder if this is real or just a bad dream. I have been very lucky to work with Per-Simon for 6 years in the Antenna Group at Chalmers, and get my PhD under his supervision. He really trusted me from the very beginning, and encouraged me in the daily life at work. He has been a continuous source of inspiration, not only from the scientific point of view, also for his attitude towards life. I have always admired his never-ending enthusiasm, positivism and courage for never giving up his ideas and dreams. I keep for myself so many beautiful and wonderful memories of shared moments with him together with the rest of the Antenna Group. For me those memories are just incredible treasures. I keep as a very special one when he attended my wedding in Spain. That day, Per-Simon gave me a beautiful poem he wrote about "love and antennas". You were so unique, authentic and special, Per-Simon… and you certainly left us way too early. Thank you so much for everything you gave me during all these years. I will miss you forever, but I am sure you will always guide me as you did until now. All my love and support go to his family who has gone through these very tough moments.
Prof Yi Huang, Department of Electrical Engineering & Electronics, The University of Liverpool
Dear Per-Simon, it was good to know you and discuss with you, and sorry that you are now not able to contribute to our next Reverberation Chamber book. You will be missed by many of us.
Milos Mazanek, Department of Electromagnetic Field, Czech Technical University in Prague
I cannot believe that the morning, April 11, 2016 was the last when I was sitting next to Per Simon. ........ and now this chair is empty. You will stay in our hearts forever, Per-Simon
with deep sadness

Per Simon at the end of the EuCAP in Prague, receiving the EuCAP flag for “HIS” conference EuCAP 2013 in Gothenburg. From Milos, CTU in Prague

Dr Miguel Navarro-Cía, Birmingham Fellow, School of Physics and Astronomy, College of Engineering and Physical Sciences, University of Birmingham
Out antenna community is deeply saddened by his passing. I will always remember Per-Simon fondly and feel lucky that I had the pleasure of knowing him. His passing leaves an enormous void in our field. May peace and comfort find his family.

W. Ross Stone, Member, EurAAP Delegates Assembly, Honorary Life Member, IEEE AP-S AdCom
My deepest condolences to Per-Simon’s family, colleagues, and friends. I had known Per-Simon for over 30 years, through his support of the AP-S Newsletter and Magazine, through working with him in various aspects of AP-S and EurAAP, and working with him when he organized EuCAP2013. He was an outstanding teacher, author, engineer, and entrepreneur. Our field has lost one of its leaders, and we have all lost a wonderful friend.

Christophe Craeye, Université catholique de Louvain
It is so difficult to use the past tense talking about Professor Kildal, who left us so suddenly. We thank him for all the important contributions he gave to his scientific community and wish a lot of strength to his family, friends and close collaborators.

Malcolm Ng Mou Kehn, Associate Professor, National Chiao Tung University, Taiwan
There has never been a shock greater than this and I am still in a state of disbelief. This is just too sudden and no words can express the grief. Per-Simon was more than just a great mentor and close friend; he is my role model and hero, someone who I look up to with utmost respect and admiration. This makes the loss all the more hard to bear. May we all stay strong during this very difficult period, especially Per-Simon's family. Their anguish would be even more unimaginable and our prayers are with them. Rest in peace, Per-Simon. You will always remain in our fond memories.

Rob Lewis, Capability Technology Leader, BAE Systems Applied Intelligence, and Chair, Antennas & Propagation Network of the IET
This is sad news indeed.  Per-Simon was a valued friend, innovative engineer and an inspirational teacher.
He will be greatly missed by his colleagues and particularly those in the European School of Antennas.

Ann-Christine Nordin, Journalist och projektledare, Chalmers tekniska högskola
Det är med sorg jag läser att Per-Simon Kildal gått bort. Vi möttes under den tid jag var redaktör för Chalmers magasin. Samtalet vi hade inför en intervju i Chalmers magasin var enormt roligt och inspirerande. Per-Simon Kildal stack ut. Samma sak sa journalisten som senare kom att intervjua honom. Här är intervjun igen. Den är väl värd att läsas:
Simulerad verklighet
En knäpp idé av en galen professor tyckte mobilbranschen. Tio år senare omsätter den 40 miljoner kronor om året. Det finns de som säger att när Per-Simon Kildal går loss på en idé så går det inte att stoppa honom...

Ari Sihvola, Aalto University, School of Electrical Engineering Department of Radio Science and Engineering
Requiem aeternam dona ei, Domine

Jian Yang, Associate Professor, Antenna Group, Dept. of  Signals and Systems
I still cannot believe that Per-Simon has been away from us. This sad news was a shock in the beginning, which made me suddenly losing my feeling. Then, the empty, the sorrow and doubt about the news came to me during the whole weekend. I am still struggling with myself if this is true. I have been working with Per-Simon the whole twenty years, from 1996 to now, the longest daily-working colleague. Looking back in my research career, he was everywhere. Looking forward to future work, I am sure he will be somewhere as a guider, example and inspiration. My family has also close relation with Per-Simon and his family. My whole family miss you. Dear Per-Simon, wish you in peace.

Professor Olav Breinbjerg, DTU Electrical Engineering, Technical University of Denmark
Through European and Nordic cooperations, as well as through direct contacts, I have known Per-Simon for more than 20 years as an enthusiastic and visionary educator and scientist.  It is incredibly sad and a great loss to our antenna and electromagnetics community that he suddenly is no more; though his many contributions to our field will of course stay with us for many years to come.  My sincere condolences to his family.

Prof. Werner Wiesbeck, Inst. Hochfrequenztechnik und Elektronik, Karlsruhe Institute of Technology
we shall never forget you. I cross my hands and pray for you.

Alejandro Valero, Professor at Universidad Politecnica de Valencia, Spain
Dear Per-Simon, you left us too soon. You have been an inspiration as a scientist and as a man.
Yet, above all the sorrow I feel now, it stands the gratitude for having shared a little bit of your life.
Rest in peace my dear friend

Professor Tony Brown, Professor of Communication Engineering, School of Electrical and Electronic Engineering, University of Manchester
I have known Per-Simon through his work and personally  for thirty years. His contribution to electromagnetics and antennas is legendary with an impact well beyond the academic community. However my main memories are of an engaging and open personality linked with true intellectual power. I shall treasure the many talks we had together
My thoughts are of course with his family at this truly difficult time.

Dr. Eloy de Lera Acedo, Senior Research Associate, Astrophysics Group, Cavendish Laboratory, University of Cambridge
I wish all the best to his family and friends in these hard times. He was a leader in the antenna community who I had the chance to briefly meet in the EuCAP conferences and I can feel the great loss his early departure represents to our community.

Arne Svensson, Head of Department, Signals and Systems, Chalmers
Per-Simon's death came as a shock to us, and was far too early in his life. I know that Per-Simon had the intention to work for many more years. It is a huge loss for Chalmers and for the research but not least for the family, colleagues and friends of Per-Simon. My thoughts are now mainly with the family who has gone through a difficult time in recent weeks, and the grief that follows. His passing is completely incomprehensible and will for all of us to take a long time to process.
Rest in peace, Per-Simon.

Page manager Published: Mon 08 Aug 2016.