Communications: radio wave antennas – Antennas – With lumped reactance filter in active antenna
Patent
1981-11-16
1984-04-10
Lieberman, Eli
Communications: radio wave antennas
Antennas
With lumped reactance filter in active antenna
343750, H01Q 914, H01Q 918
Patent
active
044424361
ABSTRACT:
A six-band vertical antenna which is omnidirectional and includes completely automatic band switching for the amateur radio frequencies of eighty/seventy-five meters, forty meters, thirty 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 provides for direct coaxial cable transmission line feed. The eighty-meter and forty-meter inductor-capacitors are in parallel while the thirty-meter inductor-capacitor is in series with a portion of the forty-meter circuit providing inductive reactance for operation on eighty-seventy-five meters, forty meters, and thirty meters with a series inductor capacitor connected between an upper vertical radiating element and the forty-meter inductor 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 decoupled above an end of a fifteen-meter quarter-wave decoupling stub in a first embodiment.
REFERENCES:
patent: 2282292 (1942-05-01), Amy et al.
patent: 4259672 (1981-03-01), Newcomb
Jaeger Hugh D.
Lieberman Eli
Wimer Michael C.
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