Patent ID: 7005940

Claim:
A multiband switching device, comprising: a multiband transformation stage having a common first signal port and a common second signal port; and a signal path coupled between the first signal port and the second signal port, the signal path being switchable via switching elements between a first state with a first quarter wavelength transformer characteristic for a first transmit mode, a second state with a second quarter-wavelength transformer characteristic for a second transmit mode and a third state with a transmission characteristic for a receive mode, wherein the multiband switching device further comprises a low-power stage comprising a signal input port coupled to the common second signal port of the multiband transformation stage; a first signal output port for being coupled to a receiver operating in a first frequency range; a second signal output port for being coupled to a receiver operating in a second frequency range, the second frequency range differing from the first frequency range; a third signal output port for being coupled to a receiver operating in a third frequency range, the third frequency range differing from the first and second frequency ranges; an auxiliary port that is terminated with a pre-determined impedance; and a signal input to receive a control signal that specifies which of the low-power stage ports is to be coupled to the common second signal port of the multiband transformation stage, wherein, depending on the received frequency range, one of the first, second, and third signal ports is coupled when the multiband transformation stage is in the third state, and wherein the auxillary port is coupled when the multiband transformation stage is in the first and second states.