Method and apparatus for improving the performance of a...

Details Method and apparatus for improving the performance of a... Method and apparatus for improving the performance of a...

2007-09-04

2007-09-04

Phan, Tho (Department: 2821)

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

C343S850000, C333S032000

Reexamination Certificate

active

11025459

ABSTRACT:
A method and apparatus for improving the efficiency of a multi-band antenna in a wireless terminal over a wide range of frequencies is described herein. To compensate for the undesirable coupling that occurs in a low frequency band between a parasitic antenna and a primary antenna in certain designs, a matching network is connected to at least one ground port of the multi-band antenna. The matching network controls the multi-band antenna performance based on the current transmission frequency band. In some embodiments, the matching network is configured to operate as an open circuit when multi-band antenna operates in the low frequency band, and to operate as a short circuit when multi-band antenna operates in the high frequency band.

REFERENCES:
patent: 5087922 (1992-02-01), Tang et al.
patent: 6518922 (2003-02-01), Hoffmeister
patent: 6873293 (2005-03-01), Proctor et al.
patent: 6930640 (2005-08-01), Chung et al.
patent: 2003/0174092 (2003-09-01), Sullivan
patent: 2004/0132487 (2004-07-01), Kearns
patent: 0993070 (2000-04-01), None
patent: WO 03/094289 (2003-11-01), None
patent: WO 03/096474 (2003-11-01), None
PCT International Search Report, International Application No. PCT/US2005/023093, mailed Oct. 18, 2005.

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