Communications: radio wave antennas – Antennas – With lumped reactance for loading antenna
Patent
1997-02-18
1999-09-21
Wong, Don
Communications: radio wave antennas
Antennas
With lumped reactance for loading antenna
343745, 343715, 343895, 343900, H01Q 900, H01Q 132
Patent
active
059559969
ABSTRACT:
A tunable capacitive coupling to a monopole antenna is provided which integrates the tuning mechanism into the supporting structure for the antenna. The base of the antenna is insulated from and supported by a cylindrical clamping assembly such as a metal compression ferrule in cooperation with an adjustment collar. This clamping mechanism enables the ferrule to be tightened like a drill bit in a chuck at any position along the base of the antenna. The coupling capacitance formed between the antenna radiator and the compression ferrule is proportional to the insertion depth of the antenna into the compression ferrule, thereby enabling the antenna to be tuned. The coupling method of the present invention enables repeatable tuning of the antenna either upward or downward in frequency within the band of frequencies accommodated by the particular antenna. The invention works especially well with so-called fiberglass antennas but is adaptable to metal elements having a lumped inductance and suitable insulation around the end of the antenna supported in the clamping assembly.
REFERENCES:
patent: 2875443 (1959-02-01), Kandoian
patent: 4080604 (1978-03-01), Wosniewski
patent: 4104639 (1978-08-01), Muchiarone
patent: 4152705 (1979-05-01), Kowds
patent: 4379298 (1983-04-01), Vincent et al.
patent: 4460896 (1984-07-01), Shmitka
patent: 4620194 (1986-10-01), Bel Moratalla
patent: 4958164 (1990-09-01), Lewis, Jr.
patent: 5274393 (1993-12-01), Scott
Ho Tan
Linnell William A.
McGowan John F.
Tandy Corporation
Wong Don
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