Communications: radio wave antennas – Antennas – With polarization filter or converter
Patent
1987-10-02
1990-02-20
Hille, Roff
Communications: radio wave antennas
Antennas
With polarization filter or converter
343762, 343766, 343776, 343786, 333135, H01Q 1302
Patent
active
049030370
ABSTRACT:
A dual frequency feed assembly for antenna systems employing a pair of rotatably mounted probes each in respective coaxial cavities. The smaller cavity is supported by the rotating means for the larger probe and the smaller probe rotates with the larger probe driven by a common motor. The higher frequency signal is taken from the side wall of the lower frequency cavity. In an alternate embodiment, the smaller cavity is supported by a spider which rotates the smaller probe by means of external gearing and a separate motor. Other embodiments show coaxial lines which enter from the front face of the assembly and allow rotation of the smaller probe.
REFERENCES:
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patent: 4554552 (1985-11-01), Alford et al.
patent: 4554553 (1985-11-01), Grim
patent: 4679009 (1987-07-01), Cloutier
patent: 4740795 (1988-04-01), Seavey
Koch et al., "Coaxial Radiator as Feed for Low Noise Paraboloid Antennas", Nachrichtentech, Z., vol. 22, 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 Transactions on Antennas & Propagation, vol. AP-34, No. 8, Aug. 1986 "Input Mismatch of TE.sub.11 Feeds Mode Coaxial Waveguide", Trevor S. Bird, Graeme 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.
Blachley Gerry B.
Mitchell Rodney A.
Antenna Downlink, inc.
Hille Roff
Wagner John E.
Wimer Michael C.
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