Communications: radio wave antennas – Antennas – Wave guide type
Patent
1975-07-21
1977-07-05
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
343782, H01Q 1912
Patent
active
040343782
ABSTRACT:
A Cassegrainian antenna having a feed horn, a subreflector and a main reflector exhibits subreflector reflections back toward the feed horn. Some of this energy is reflected by the feed horn, and some by the main reflector adjacent to the feed horn, back toward the subreflector. This doubly reflected energy constitutes an echo which is reduced in the prior art by using a flat reflector plate mounted near the subreflector to cancel energy radiated by the subreflector back toward the region of the feed horn. Herein is disclosed the addition of a frequency sensitive reflecting wire grid between the flat plate and the feed horn. A combined reflection from the grid, plate, and subreflector provides echo cancellation in two frequency ranges. The plate may be recessed in a hole in the subreflector. A guard ring surrounding the plate prevents leakage through the subreflector hole.
REFERENCES:
patent: 3133284 (1964-05-01), Privett et al.
patent: 3231893 (1966-01-01), Hogg
patent: 3235870 (1966-02-01), Hannan
Ware et al., Electrical Communication, vol. 40, No. 2, 1965, pp. 200-203.
Richter, Nachrichtentechnische Fachberichte, vol. 45, pp. 111-115, 1972.
Bell Telephone Laboratories Incorporated
Hollander James F.
Lieberman Eli
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