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

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 excel...

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Veröffentlicht in:	IEEE transactions on antennas and propagation 2013-03, Vol.61 (3), p.1099-1108
Hauptverfasser:	Akgiray, A., Weinreb, S., Imbriale, W. A., Beaudoin, C.
Format:	Artikel
Sprache:	eng
Schlagworte:	Antennas Aperture antennas Applied sciences Astronomical and space-research instrumentation Astronomy Bandwidth Computational efficiency Cutoff frequency Earth, ocean, space Exact sciences and technology Feeds Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations Horn antennas Horns Mathematical analysis Noise temperature Radio astronomy Radio telescopes Radio telescopes and instrumentation heterodyne receivers Radiocommunications reflector antenna feeds reflector antennas ridge waveguides Telecommunications Telecommunications and information theory ultrawideband antennas Wideband
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Beschreibung
Zusammenfassung:	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.
ISSN:	0018-926X 1558-2221
DOI:	10.1109/TAP.2012.2229953