Difference drive diversity antenna structure and method

Details Difference drive diversity antenna structure and method Difference drive diversity antenna structure and method

1997-05-09

1999-11-02

Le, Hoanganh

Communications: radio wave antennas

Antennas

With radio cabinet

343725, 343729, 343727, H01Q 124, H01Q 2128

Patent

active

059779160

ABSTRACT:
A difference drive diversity antenna structure (200) and method for a portable wireless communication device (230) aligns a first linear antenna (240) parallel to a major axis (245) of the communication device and drives dual radiators (252, 254) of a second antenna (250) at equal magnitudes but with a 180 degree phase difference. A difference drive diversity antenna structure implemented in a portable wireless communication device maintains significant decorrelation between the first antenna (240) and the second antenna (250) over the common frequency ranges of the dual radiators (252, 254). Also, antenna currents on the body of the communication device are minimized and the effects of a hand or body near the communication device are reduced.

REFERENCES:
patent: 4575725 (1986-03-01), Tresselt
patent: 4613868 (1986-09-01), Weiss
patent: 5038151 (1991-08-01), Kaminski
patent: 5138328 (1992-08-01), Zibrik et al.
patent: 5274388 (1993-12-01), Ishizaki et al.
patent: 5463406 (1995-10-01), Vannatta et al.
patent: 5606733 (1997-02-01), Kanayama et al.
patent: 5760745 (1998-06-01), Endo et al.

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