Circular Quadruple-Ridged Flared Horn Achieving Near-Constant Beamwidth Over Multioctave Bandwidth: Design and Measurements
Ahmed Akgiray, Sander Weinreb, William A. Imbriale, Christopher Beaudoin
IEEE Transactions on Antennas and Propagation
Volume: 61, Issue: 3, March 2013
1099 - 1108
Aperture antennas, horn antennas, radio astronomy, reflector antenna feeds, reflector antennas, ridge waveguides, ultrawideband antennas
A circular quadruple-ridged flared horn achieving almost-constant beamwidth over 6:1 bandwidth is presented. This horn is the first demonstration of a wideband feed for radio telescopes which is capable of accommodating different reflector antenna optics, maintains almost constant gain and has excellent match. Measurements of stand-alone horn performance reveal excellent return loss performance as well as stable radiation patterns over 6:1 frequency range. Physical optics calculations predict an average of 69% aperture efficiency and 13 K antenna noise temperature with the horn installed on a radio telescope.
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