Communications: radio wave antennas – Antennas – With variable reactance for tuning antenna
Patent
1982-04-14
1985-10-22
Lieberman, Eli
Communications: radio wave antennas
Antennas
With variable reactance for tuning antenna
343788, H01Q 700
Patent
active
045491860
ABSTRACT:
A coil assembly that is essentially isotropic in a plane normal to the plane of the coil includes two flat coils stacked one next to the other. One coil is connected in series with a resistor in a closed loop and has a strip of high permeability material woven through it. The other coil is tuned by a parallel capacitor across its coil terminals, such terminals being connected to electronic circuity. The coil is separated from the printed circuit board that contains the electronic circuitry by a sheet of high permeability material. The assembly is self-contained and powered by a flat battery on which the circuit board is placed. Another embodiment is disclosed that contains only one coil, the terminals of which are connected to a suitable electronic circuit, not shown. Strips of high permeability material are disposed on both sides of the coil and an assembly is produced with a printed circuit board and a flat battery.
REFERENCES:
patent: 2755468 (1956-07-01), Mountjoy
patent: 3020547 (1962-02-01), Granquist
patent: 4025856 (1977-05-01), Sode
patent: 4151405 (1979-04-01), Peterson
patent: 4187509 (1980-02-01), Weiner
patent: 4413254 (1983-11-01), Pinneo et al.
Barrett, Jr. Raymond L.
Gross Thomas A. O.
Pfister Henry F.
Lieberman Eli
Sensormatic Electronics Corporation
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