Multi-band vertical antenna

Details Multi-band vertical antenna Multi-band vertical antenna

1978-11-03

1980-09-09

Lieberman, Eli

Communications: radio wave antennas

Antennas

With lumped reactance filter in active antenna

343723, 343745, H01Q 500, H01Q 932

Patent

active

042220530

ABSTRACT:
A vertical antenna which is omnidirectional and includes completely automatic band switching for the amateur radio frequencies of one hundred and sixty meters, eighty-seventyfive meters, forty meters, twenty meters, fifteen meters, and ten meters. The vertical antenna has a low angle of radiation and a low standing wave ratio on all frequencies which permits direct coaxial cable transmission line feed. The eighty meter and forty meter resonator capacitor sections provide inductive reactance for operation on eighty-seventyfive meters and forty meters while permitting simultaneous resonance on each of the three higher frequencies of twenty, fifteen, and ten meters. The entire radiator length of the vertical antenna is active on all frequencies except for fifteen meters where the upper portion of the antenna is trapped out by a fifteen meter decoupling trap. A one hundred and sixty meter tuning unit for the vertical antenna employs a combination of fixed and variable inductance in a high-C parallel-tuned circuit to generate inductive reactance to resonate the vertical antenna on one hundred and sixty meters.

REFERENCES:
patent: 2898590 (1959-08-01), Pichitino
patent: 3089140 (1963-05-01), Monola
patent: 3176298 (1965-03-01), Nettles
patent: 4145693 (1979-03-01), Fenwick

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