Device and method for antenna matching in portable wireless...

Details Device and method for antenna matching in portable wireless... Device and method for antenna matching in portable wireless...

2007-07-03

2007-07-03

Nguyen, Hoang V. (Department: 2821)

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

C343S702000, C455S575300

Reexamination Certificate

active

11249064

ABSTRACT:
Disclosed is an antenna matching device of a folder type portable wireless terminal with a built-in antenna. In the antenna matching device, a π-type matching circuit is connected between an built-in antenna and a duplexer, one end of a passive element is shunted between the π-type matching circuit and the duplexer, and an active element opens or connects the other end of the passive element to ground according to the opening or closing of a folder of the terminal. The antenna matching device lowers antenna impedance difference between the opened and closed states of the folder, such that the terminal can constantly maintain its radiation performance, such as VSWR and resonant frequency, regardless of the opened or closed position of the folder.

REFERENCES:
patent: 6765540 (2004-07-01), Toncich
patent: 6862432 (2005-03-01), Kim
patent: 6985760 (2006-01-01), Hosonuma
patent: 10-2001-0011282 (2001-02-01), None

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