Means for tuning a loaded coil antenna

Details Means for tuning a loaded coil antenna Means for tuning a loaded coil antenna

1976-09-21

1978-03-21

Lieberman, Eli

Communications: radio wave antennas

Antennas

With lumped reactance for loading antenna

343745, 343861, H01Q 900

Patent

active

040806049

ABSTRACT:
A loading coil connects between an antenna and ground and has an intermediate feed point. A conductive member opposes at least several turns of the loading coil and is disposed in distributed capacitive relationship therewith. The conductive member and coil are separated by a dielectric member. The conductive member is preferably movable with respect to the coil to change the resonant frequency of the antenna and may be a conductive ring or disk axially shiftable with respect to the coil or a vane pivotable with respect to such coil. In one embodiment, the conductive member is fixed and the dielectric member, having a dielectric constant different from air, is shiftable to change the distributed capacitance of the conductive member and coil and hence the resonant frequency of the antenna apparatus.

REFERENCES:
patent: 3064257 (1962-11-01), Guest
patent: 3474453 (1969-10-01), Ireland
patent: 3798654 (1974-03-01), Martino et al.

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