Collocated non-interfering dual frequency microwave feed assembl

Details Collocated non-interfering dual frequency microwave feed assembl Collocated non-interfering dual frequency microwave feed assembl

1989-09-11

1992-04-21

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With polarization filter or converter

343786, 333 21A, 333135, H01Q 1302

Patent

active

051072742

ABSTRACT:
A dual frequency feed assembly for an antenna system having two coaxial cavities, with a smaller, high-frequency cavity mounted coaxially within a larger, low-frequency cavity. A separately rotatable probe is mounted within each cavity. The smaller cavity is mounted within the larger cavity by any of several structures, such as a ring-shaped spider, a ring-shaped spacer in the form of a planar washer, or a harp extending rearwardly in the larger cavity.

REFERENCES:
patent: 4504836 (1985-03-01), Seavy
patent: 4544900 (1985-10-01), Howard
patent: 4554532 (1985-11-01), Alford et al.
patent: 4554553 (1985-11-01), Grim
patent: 4679009 (1987-07-01), Cloutier
patent: 4740795 (1988-04-01), Seavey
patent: 4903037 (1990-02-01), Mitchell et al.
Koch et al., "Coaxial Radiator as Feed for Low Noise Paraboloid Antennas", Nachrichtentech, Z., vol. 22, pp 166-173, 1969.
Jeuken et al., "A Dual Frequency, Dual Polarized Feed for Radioastronomical Applications", Nachrichtentech, Z., vol. 25, pp. 374-376, 1972.
Livington, "Multifrequency Coaxial Cavity Apex Feeds", Microwave Journal, vol. 22, pp. 51-54, Oct., 1979.
IEEE Transaction on Antennas & Propagation, vol. AP-34, No. 8, Aug., 1986 "Input Mismatch of TE.sub.11 Feeds Mode Coaxial Waveguide", Trevor S. Bird, Grameme L. James & Stephen J. Skinner, pp. 1030-1033.
IEEE Transactions on Microwave Theory & Techniques, vol. MTT-35, No. 4 Apr., 1987, "Admittance of Irises in Coaxial & Circular Waveguides for TE.sub.11 -Mode Excitation", Graeme L. James, pp. 430-434.

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