Patent ID: 7043285

Claim:
A wireless terminal having a dual band antenna arrangement comprising an antenna ( 10 ) having a first feed ( 12 ) for signals in a first, lower frequency band, a second feed ( 14 ) for signals in a second, higher frequency band and a ground pin ( 16 ), first coupling means ( 26 A) for coupling transmit and receive paths of a first transceiver to the first feed, second coupling means ( 26 B) for coupling transmit and receive paths of a second transceiver to the second feed, each of the first and second coupling means comprising a quarter wavelength transmission line ( 50 A, 50 B) having a first end coupled to the respective transmit signal path and a second end coupled by bandpass filtering means ( 52 A, 52 B) to the respective receive signal path, a first switching device (D 1 , D 3 ) coupling a transmit signal path to the first end of the respective quarter wavelength transmission line, a second switching device (D 2 , D 4 ) coupling the second end of the respective quarter wavelength transmission line to ground, and means ( 36 ) for switching-on the first and second switching devices of one of the first and second coupling means when in a transmit mode and for switching-off the first and second switching devices when in a receive mode, the first and second switching devices of the other of the first and second coupling means being non-conductive.