Antenna structure used in portable radio device

Details Antenna structure used in portable radio device Antenna structure used in portable radio device

1991-08-07

1993-07-13

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With radio cabinet

343720, 343856, H01Q 124

Patent

active

052278042

ABSTRACT:
An antenna structure comprises a loop antenna electrically connected to a high-frequency circuit of a portable radio device. The antenna structure also comprises a supplemental antenna including a coil spring which is used for fixing a dry battery powering the portable radio device, and a negative cylindrical conductor of the dry battery which conductor is electrically connected with the coil spring. The coil spring is placed to be inductively coupled to the loop antenna. The longitudinal axis of the dry battery is substantially perpendicular to a plane including the loop antenna. Thus, deterioration in signal reception sensitivity due to the directivity of the loop antenna can be compensated by the supplemental antenna.

REFERENCES:
patent: 3736591 (1973-05-01), Rennels et al.
patent: 4590614 (1986-05-01), Erat
patent: 4591863 (1986-05-01), Patsiokas
patent: 4814776 (1989-03-01), Gaci et al.
patent: 4862181 (1989-08-01), Ponce de Leon et al.
patent: 4864636 (1989-09-01), Brunius
patent: 4873527 (1989-10-01), Tan

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