Ultra Wide Band Antennas for Radio Astronomy

The Antenna research group is currently developing a new decade bandwidth antenna with constant directivity and phase center over a decade bandwidth. This unique technology generates a performance previously unheard of. The main application is future radio telescopes such as VLBI2010 and SKA (Square Kilometer Array), but the technique can also be applied to satcom terminals, radio links and medical imaging.

The latest work includes the development of a compact 1.2-13 GHz model for SKA and the analysis of its performance in reflector antenna systems. Methods have been carried out to model and test system noise temperature with integrated Low Noise Amplifiers (LNAs), when both feed and LNAs are mounted inside a cryostat (cooling machine) with a radio frequency window and cooled down to a few Kelvin. Furthermore, we develop numerical methods to predict the imaging performance of such wideband antennas when operating at radio telescopes.

The project is a collaboration between three departments at Chalmers: Signals and Systems (antenna), Onsala Space Observatory (cryostat) and Microtechnology and Nanoscience (LNAs).

Figure: Illustration of reflector for SKA radio telescope fed by  decade bandwidth so-called eleven feed developed at Chalmers

 

VR

Published: Mon 28 Oct 2013.