Retractable top load antenna

Details Retractable top load antenna Retractable top load antenna

1997-07-14

1999-12-28

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With radio cabinet

343752, H01Q 124

Patent

active

06008765&

ABSTRACT:
An antenna assembly comprises an elongate antenna element (11) mounted in a support (5) and movable between a retracted position and an extended position. A helical antenna element (12) in electrical contact with the helical element is carried at one end of the elongate element. The coupling between the feed point and the antenna in the retracted and extended positions allow the same matching circuitry to be used in both conditions. The invention provides a compact and convenient dual antenna arrangement ideally suited for use in a portable cellular radio telephone.

REFERENCES:
patent: 4121218 (1978-10-01), Irwin et al.
patent: 4868576 (1989-09-01), Johnson, Jr.
patent: 4998078 (1991-03-01), Hulkko
patent: 5138329 (1992-08-01), Saarnimo et al.
patent: 5374937 (1994-12-01), Tsunekawa et al.
patent: 5467096 (1995-11-01), Takamoro et al.

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