Patent ID: 6072993
Filing Date: 2000-06-06
Classification: H01Q,H04B

Abstract:
A portable radio transceiver for selectively transmitting/receiving radio frequency (RF) signals in a first frequency band or a second frequency band via a first antenna or a second antenna, comprising:transmission means for carrying said RF signals to/from said first and second antennas;a plurality of switches for selecting either said first antenna or said second antenna for reception/transmission of said RF signals; anda tuning circuit for selectively adjusting impedance of said transmission means placed between quarter-wave length lines to insure maximum power transfer when said reception/transmission of said RF signals is carried out via said first antenna, said tuning circuit being disconnected from said transmission means by one of said switches if said reception/transmission of said RF signals is carried out via said second antenna such that a bias current is not required.