Communications: radio wave antennas – Antennas – Wave guide type
Patent
1995-06-09
1997-04-01
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Wave guide type
333135, H01Q 1300
Patent
active
056171080
ABSTRACT:
An antenna pointing detection system for use with circularly polarized electromagnetic radiation has a horn, a waveguide and at least one mode switching arm. The horn receives radiation in a primary mode from the radiation source. The waveguide receives radiation from the horn and supports only radiation in a primary mode, e.g. the TE.sub.11 mode and the next higher order TE mode, e.g. the TE.sub.21 mode at one or more rectangular mode switching arms extending from the circular waveguide for stimulating radiation of the-next order TE.sub.21 mode in the waveguide. The arm has a series of switchable pin diodes for changing the effective length of the mode switching arm to cause a phase alteration in the TE.sub.21 mode thereby causing a deflection of the effective pointing direction of the horn. The magnitude of the received signal is detected and compared with different deflections of the horn to operate conventional antenna pointing hardware.
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B.K. Watson, N.D. Dang, I. Davis, D. Edwards, A.W. Rudge and E.C. Johnstone, "A New Electronic Tracking System for Fine Pointing of Large Reflectors" 1986 IEEE, pp. 420-424.
D.J. Brain, N.D. Dang, I.M. Davis and D.A. Granville-George, "KA-Band Tracking Antenna for Inter-Orbit Communications" 1989 IEEE, pp. 1606-1609.
Boldissar, Jr. Frank
Campbell Gary S.
Silinsky Robert E.
Tahim Raghbir S.
Denson-Low Wanda K.
Gudmestad Terje
Hajec Donald T.
Hughes Electronics
Phan Tho
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