Antenna system for a wrist carried paging receiver

Details Antenna system for a wrist carried paging receiver Antenna system for a wrist carried paging receiver

1988-01-07

1989-10-10

Sikes, William L.

Communications: radio wave antennas

Antennas

Body-attached or connected

343788, H01Q 708

Patent

active

048735272

ABSTRACT:
The antenna system of the present invention includes a single loop antenna connected in series with a ferrite core loop antenna. The single loop antenna is enclosed in a nonconductive housing, such as a band, which surrounds the wrist. The single loop antenna has a first end grounded and is connected in series with a first variable capacitive element for adjusting the resonant frequency of the single loop antenna. The ferrite core loop antenna is connected to a second variable capacitive element for adjusting the resonant frequency of the ferrite core loop antenna. One end of the ferrite core loop antenna is applied as an input to a communication receiver such as a paging receiver. The outstanding feature of the antenna system is that the axis of the single loop antenna is perpendicular to and noncoplanar with the ferrite core loop axis for enhancing the sensitivity and minimizing body effects caused by hand movements.

REFERENCES:
patent: 2255897 (1941-09-01), Rebori et al.
patent: 3683389 (1972-08-01), Hollis
patent: 4155091 (1979-05-01), Vorie

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