Antenna for portable radio devices

Details Antenna for portable radio devices Antenna for portable radio devices

1994-10-13

1997-09-16

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

With radio cabinet

343895, 343752, H01Q 124, H01Q 136

Patent

active

056685599

ABSTRACT:
The present invention concerns an antenna for portable radio devices including a helical antenna coupled at the base to a transmitter/receiver. The pitch of a conductive material helix constituting the helical antenna varies according to the height of the helix. It decreases from the base of the helical antenna towards its top.

REFERENCES:
patent: 2982964 (1961-05-01), Bresk et al.
patent: 3283332 (1966-11-01), Nussbum
patent: 3573840 (1971-04-01), Gouillou et al.
patent: 3852759 (1974-12-01), Felsenheld et al.
patent: 4121218 (1978-10-01), Irwin et al.
patent: 4169267 (1979-09-01), Wong et al.
patent: 4543581 (1985-09-01), Nemet
patent: 4868576 (1989-09-01), Johnson, Jr.
patent: 4890114 (1989-12-01), Egashira
patent: 5317325 (1994-05-01), Bottomley
patent: 5329287 (1994-07-01), Strickland
patent: 5335366 (1994-08-01), Daniels

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