Reduced operator emission exposure antennas for safer hand-held

Details Reduced operator emission exposure antennas for safer hand-held Reduced operator emission exposure antennas for safer hand-held

1995-03-08

1996-07-30

Le, Hoanganh

Communications: radio wave antennas

Antennas

With radio cabinet

343792, 343901, 455 89, 455 90, H01Q 124

Patent

active

055416098

ABSTRACT:
An antenna for a personal communication device designed for reducing RF emissions to a user's head and body comprises a single half-wave dipole antenna element mounted on the top of a telescoping rod such that the antenna element is raised above the user's head when the rod is extended. The rod is completely inactive and serves only to elevate the active antenna element above the user's head and away from the body. A built-in switch is provided which reduces the transmission RF power when the rod is retracted to further protect the user. In a second embodiment, a co-linear array of dipole antenna elements is used. The full array is active for reception. However, a proximity detector senses the proximity of a human body, and lowers the RF transmission power to those antenna elements in the array that are closest to the user's head.

REFERENCES:
patent: 4811421 (1989-03-01), Havel et al.
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patent: 4963879 (1990-10-01), Lin
patent: 5231407 (1993-07-01), McGirr et al.
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patent: 5338896 (1994-08-01), Danforth
patent: 5374937 (1994-12-01), Tsunekawa et al.
patent: 5440317 (1995-08-01), Jalloul et al.

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