Patent ID: 6526263
Filing Date: 2003-02-25
Classification: H01Q,H03H,H04B

Abstract:
An antenna impedance adjuster comprising:(a) an antenna through which radio signals are received and transmitted; (b) a radio signal receiver which receives radio signals having been received through said antenna; (c) a radio signal transmitter which transmits radio signals through said antenna; (d) an adjuster which matches an impedance between said antenna and said radio signal receiver in radio signal receiving band and an impedance between said antenna and said radio signal transmitter in radio signal transmitting band, wherein said adjuster is designed to have a variable circuit structure; (e) a first switch which electrically connects said adjuster to one of said radio signal receiver and said radio signal transmitter; and (f) a controller which controls an operation of said first switch when a radio signal is received or transmitted, whereby a circuit structure of said adjuster is varied when a radio signal is received or transmitted; and wherein said adjuster includes: (d1) a first adjuster which matches an impedance between said antenna and said radio signal receiver in radio signal receiving band; (d2) a second adjuster which matches an impedance between said antenna and said radio signal transmitter in radio signal transmitting band, when electrically connected to said first adjuster; and (d3) a second switch which disconnects said second adjuster from said first adjuster when a radio signal is to be received, and electrically connects said second adjuster to said first adjuster when a radio signal is to be transmitted.