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Circular Quadruple-Ridged Flared Horn Achieving Near-Constant Beamwidth Over Multioctave Bandwidth: Design and Measurements

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4 Author(s)
Akgiray, A. ; Dept. of Electr. Eng., California Inst. of Technol., Pasadena, CA, USA ; Weinreb, S. ; Imbriale, W.A. ; Beaudoin, C.

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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Antennas and Propagation, IEEE Transactions on  (Volume:61 ,  Issue: 3 )