Communications: radio wave antennas – Antennas – With variable reactance for tuning antenna
Patent
1992-06-05
1994-03-22
Hajec, Donald
Communications: radio wave antennas
Antennas
With variable reactance for tuning antenna
343750, 343895, 343708, H01Q 906, H01Q 128
Patent
active
052968677
ABSTRACT:
A switching device for adjusting the impedance of a self-inductance (3) forming part for example of the radiator of a VHF/UHF antenna for aircraft switchable by short-circuiting a part of the self-inductance. A PIN diode (12) is raised to a blocking or a transmitting voltage in response to control signals which are transmitted thereto by an optical link (8). Preferably the optical signals are transmitted to a hybrid opto-electronic circuit, which renders the PIN diode operative in conjunction with insulated conductors (11, 13) plated on the self-inductance and raised to the desired voltage.
REFERENCES:
patent: 3852759 (1974-12-01), Felsenheld et al.
patent: 4502025 (1985-02-01), Carl, Jr. et al.
patent: 4656483 (1987-04-01), Jaquet
patent: 4939525 (1990-07-01), Brunner
1987 International Symposium Digest Antennas and Propagation vol. I. Jun. 1987, Blacksburg, Va. pp. 422-425; Joesph et al.: `Applications of Microwave Fiber Optic Links`.
Radio and Electronic Engineer vol. 54, No. 1, Jan. 1984, London GB, pp. 1-9; Davies: `Opto-electronics-a new dimension in electronics`.
Dassault-Aviation
Hajec Donald
Le Hoang-anh
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