Tunable fiberglass whip antenna

Details Tunable fiberglass whip antenna Tunable fiberglass whip antenna

1978-10-13

1980-07-22

Lieberman, Eli

Communications: radio wave antennas

Antennas

With lumped reactance for loading antenna

343895, H01Q 136

Patent

active

042142474

ABSTRACT:
A tunable fiberglass whip antenna comprises an elongated fiberglass core having a conductive wire coiled around the core and serving as the antenna. The uppermost extremity of the wire is tightly coiled around an axial bore within the fiberglass. A metal insert, fixed within the fiberglass bore is in threaded engagement with a set screw accessible from the top of the antenna. By adjusting the longitudinal position of the set screw relative to the tightly wound wire at the end of the antenna, the inductive coupling between the coil and screw is varied to thereby change the effective length of the antenna.

REFERENCES:
patent: 2938210 (1960-05-01), Harris
patent: 3474453 (1969-10-01), Ireland
patent: 4097867 (1978-06-01), Eroncig

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