Communications: radio wave antennas – Antennas – Wave guide type
Patent
1977-11-17
1979-11-27
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
343781CA, H01Q 1914
Patent
active
041763580
ABSTRACT:
A reflector antenna is provided with two sets of perturbation reflectors, in the form of annular surface depressions, to reduce the effect of `external reflection` which is caused by energy re-entering a feed horn after reflection from the antenna. The two sets of perturbation reflectors are arranged to produce vector cancellation at two operating frequency bands.
REFERENCES:
patent: 2607010 (1952-08-01), Kock
patent: 4031538 (1977-06-01), Lundgren
Lieberman Eli
The Marconi Company Limited
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