Retractable antenna

Details Retractable antenna Retractable antenna

1995-11-03

1997-11-11

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

With radio cabinet

343895, 343850, H01Q 124

Patent

active

056869274

ABSTRACT:
A retractable antenna for use with a communications device such as a cellular telephone is described and which may be moved from a fully extended position to a fully retracted position with respect to the telephone housing. The telephone circuitry utilizes a matching circuit to match a high impedance when the antenna is in the extended position. When the antenna is in the retracted position, it changes from a series resonance circuit to a parallel resonance circuit so that it may match the low impedance.

REFERENCES:
patent: 4205319 (1980-05-01), Gasparaitis et al.
patent: 4760401 (1988-07-01), Imazeki
patent: 4849767 (1989-07-01), Naitou
patent: 4867698 (1989-09-01), Griffiths
patent: 5079558 (1992-01-01), Koike
patent: 5177492 (1993-01-01), Tomura et al.
patent: 5204687 (1993-04-01), Elliott et al.
patent: 5300940 (1994-04-01), Simmons
patent: 5353036 (1994-10-01), Baldry
patent: 5374937 (1994-12-01), Tsunekawa et al.
Lightweight Trap Antennas--Some Thoughts Jun. 1983.

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