Communications: radio wave antennas – Antennas – With variable reactance for tuning antenna
Patent
1984-09-26
1987-04-07
Lieberman, Eli
Communications: radio wave antennas
Antennas
With variable reactance for tuning antenna
343750, 343895, 343708, H01Q 906, H01Q 128
Patent
active
046564837
ABSTRACT:
This invention concerns an antenna switchable between the VHF and UHF frequency bands. This antenna incorporates a capacitive element, disposed at a specified distance from a reflecting surface mounted on the body of the vehicle. For VHF, tuning is obtained by a fixed self-inductance in parallel and a variable self-inductance in series with the capacitive element. The latter comprises various sections which can be short-circuited by switches. For UHF, the variable self-inductance is totally short-circuited and the fixed self-inductance is disconnected by a switch; then, plates form, with the reflecting surface and the capacitative element, a "manchette" antenna. This switchable antenna can in particular be mounted on an airplane.
REFERENCES:
patent: 3852759 (1974-12-01), Felsenheld et al.
patent: 4343001 (1982-08-01), Anderson et al.
patent: 4564843 (1986-01-01), Cooper
Cooper, "Airborne Low-VHF Antennas", Advisory Group for Aerospace Research & Development, 26th meeting held at the Oberfinanzdirektion, Munich, Germany, 26-19 Nov. 1973.
Avions Marcel Dassault-Breguet Aviation
Lieberman Eli
Wimer Michael C.
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