Antenna for a radio communication apparatus

Details Antenna for a radio communication apparatus Antenna for a radio communication apparatus

1994-02-24

1995-08-01

Hajec, Donald

Communications: radio wave antennas

Antennas

With radio cabinet

343895, H01Q 124

Patent

active

054383390

ABSTRACT:
A miniature and high performance antenna applicable to a radio communication apparatus and made up of a straight antenna rod and an antenna coil or coil element. A first whip antenna has a first portion retractable into the casing of the apparatus and a second portion constantly positioned externally of the casing. A second whip antenna has a coil element in the form of a loading coil having a predetermined number of turns. The second whip antenna is coaxially provided on the upper end of the first whip antenna and slidable relative to and in the axial direction of the first whip antenna. The second portion of the first whip antenna is movable between a position where one end of the coil element is disengaged from one end of the second portion and a position where the former is engaged with the latter. The antenna exhibits a desirable electric characteristic when pulled out of the casing of the apparatus and, in addition, promotes the efficient use of the limited space available in the casing.

REFERENCES:
patent: 4121218 (1978-10-01), Irwin et al.
patent: 4868576 (1989-09-01), Johnson, Jr.
patent: 5168278 (1992-12-01), Morita
patent: 5177492 (1993-01-01), Tomura et al.
patent: 5204687 (1993-04-01), Elliott et al.
patent: 5317325 (1994-05-01), Bottomley
By J. Wiggenhorn, "Hel/Tel Antenna", Motorola Technical Developments, Jun. 1993, vol. 19, p. 118.

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