Dual band feed with integrated mode transducer

Details Dual band feed with integrated mode transducer Dual band feed with integrated mode transducer

1997-02-20

1999-12-21

Wong, Don

Communications: radio wave antennas

Antennas

Wave guide type

343785, 343781R, 333126, H01Q 1300

Patent

active

060055286

ABSTRACT:
A single radiating structure with an integrated mode transducer that produces near-ideal radiation characteristics at two frequency bands. The dual band feed consists of three main sections: feed waveguide, mode transducer and corrugated horn. The feed waveguide consists of two concentric, circular waveguides that are excited in the TE.sub.11 coaxial and circular waveguide modes for the low and high bands, respectively. The mode transducer, which is critical to the performance of the feed, provides a single mode, low return loss transition, for both bands, between the feed waveguide and the corrugated horn. This is achieved by converting the TE.sub.11 circular waveguide modes into the fundamental hybrid, HE.sub.11, mode of the corrugated horn. The corrugated horn, which is a stepped-slot configuration, is designed to achieve a smooth transition from the mode transducer and to produce the desired radiation characteristics at both frequency bands.

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"Cross-Polarization Analysis of Dual Frequency Band Corrugated Conical Horns," Isao Nori, Ryuichi Iwata, Akira Abe, NEC Corporation, Proceedings of ISAP 1985, pp. 49-52.
"Mode Conversion Using Circumferentially Corrugated Dylindrical Waveguide," Electronics Letters, Jul. 27th, 1972, vol. 8, No. 16, pp. 394-396.
"Coaxial Waveguide Diplexing Circuit Using a Corrugated Waveguide Transition," R. W. Gruner, COMSAT Laboratories, Clarksburg, Maryland 20971, 1987 IEEE, pp. 692-695.

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