Communications: radio wave antennas – Antennas – Wave guide type
Patent
1983-10-14
1985-08-06
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
H01Q 1302
Patent
active
045339198
ABSTRACT:
The present invention relates to an antenna feed arrangement capable of providing a zero reflection response at a first frequency of interest and a maximally flat response at a widely separated second frequency of interest. The feed arrangement comprises a smooth-walled waveguide section at a first end, a corrugated waveguide section at a second end designed to provide the zero response at the first frequency, and a quarter-wave transformer waveguide section disposed between the smooth-walled and corrugated waveguide sections designed to provide the maximally flat response at the second frequency. The quarter-wave transformer section comprises a plurality of N corrugated waveguide subsections, where N.gtoreq.2, which comprise corrugation depths corresponding to the corrugation depths in the corrugated waveguide section. Additionally, the gaps between corrugations differ in adjacent subsections in a direction away from the entrance waveguide section and have a predetermined gap ratio between adjacent subsections.
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IEEE Transactions on Antennas and Propagation, vol. AP-24(6), Nov. 1976, "Broadbanding of Corrugated Conical Horns by Means of the Ring-Loaded Corrugated Waveguide Structure", by F. Takeda et al., pp. 786-792.
IEEE Transactions on Antennas and Propagation, vol. AP-30(6), Nov. 1982, "TE.sub.11 -to-HE.sub.11 Mode Converters for Small Angle Corrugated Horns", by G. James, pp. 1057-1062.
IEEE Transactions on Antennas and Propagation, vol. AP-30(6), Nov. 1982, "A Curved-Aperture Corrugated Horn Having Very Low Cross-Polar Performance", by B. Thomas et al., pp. 1068-1072.
Foundations for Microwave Engineering, McGraw-Hill Book Company, 1966, by R. E. Collin, pp. 226-237.
AT&T Bell Laboratories
Lieberman Eli
Pfeifle Erwin W.
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