Dual function antenna structure and a portable radio having same

Details Dual function antenna structure and a portable radio having same Dual function antenna structure and a portable radio having same

1995-08-21

1997-02-04

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

Spiral or helical type

343702, H01Q 124, H01Q 136

Patent

active

056003412

ABSTRACT:
A dual function antenna structure transceives in first and second modes. A first feed (120) feeds a primary antenna element (110) for operation in the first mode. A second feed (140) couples via a coupling element (130) to a portion of the first feed (120) or the primary antenna element (110) to realize a secondary antenna element. In a portable radio, dual function operation is thus possible by a compact structure by the first and second feeds (120, 140).

REFERENCES:
patent: 2184729 (1939-12-01), Bailey
patent: 4352109 (1982-09-01), Reynolds et al.
patent: 4410893 (1983-10-01), Griffee
patent: 4433336 (1984-02-01), Carr
patent: 4509056 (1985-04-01), Ploussios
patent: 5274388 (1993-12-01), Ishizaki et al.
S. Egashira et al., "A Design of AM/FM Mobile Telephone Triband Antenna", IEEE Transactions on Antennas and Propagation, vol. 42, No. 4, Apr. 1994, pp. 538-545.

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