Aircraft shorted loop antenna with impedance matching and amplif

Details Aircraft shorted loop antenna with impedance matching and amplif Aircraft shorted loop antenna with impedance matching and amplif

1983-01-28

1985-04-09

Lieberman, E.

Communications: radio wave antennas

Antennas

With aircraft

343845, 343861, 455193, H01Q 128

Patent

active

045105006

ABSTRACT:
An active antenna system for an airborne high frequency single sideband receiver comprised of a shorted loop type antenna having an inductive characteristic over the frequency range of 2.0 to 10.0 MHz and which is tuned to resonance at a selected operating frequency by shunting the antenna at its feedpoint by selectively switched sets of voltage variable capacitors. Also coupled to the feedpoint is a field effect transistor which is adapted to provide radio frequency amplification. Impedance matching between the output of the field effect transistor and the input of a radio frequency receiver is further provided by a transistor configured as an emitter follower.

REFERENCES:
patent: 2913722 (1959-11-01), Brueckmann
patent: 3818480 (1974-06-01), West
patent: 4186350 (1980-01-01), Takayama
patent: 4339827 (1982-07-01), Torres et al.
patent: 4343001 (1982-08-01), Anderson et al.
patent: 4403347 (1983-09-01), Iso et al.
IEEE Transactions on Antennas and Propagation, vol. AP-23, No. 4, Jul., 1, pp. 462-469, "Small Antennas", H. Wheeler.
Instruction Book of Bayshore Systems Corporation, entitled, "UPS-192A Active Antenna System", Feb., 1978, pp. 3-4.
Manufacturer's spec. sheet entitled, "Active Receiving Antennas A 1205 Active DF Antennas AK 1205"-Telefunken.
Electronics World, Mar., 1968, pp. 49-52, "Tiny Antennas Push State-of-Art", Paul E. Mayes.

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