Patent ID: 8064847

Claim:
A transmit/receive switching circuit comprising: a first transformer to split a transmission signal into a first split transmission signal and a second split transmission signal, the first split transmission signal being out of phase with the second split transmission signal; a second transformer to split a received signal into a first split received signal and a second split received signal and to combine the first split transmission signal and the second split transmission signal, wherein the first split received signal is out of phase with the second split received signal and wherein the combined transmission signal is supplied to an antenna port and the received signal is received from the antenna port; a third transformer to combine the first split received signal and the second split received signal and to supply the combined received signal to a receive port of the transmit/receive switch; and first and second switches both coupled to the first transformer and to the second transformer, wherein the first switch switches between coupling the first split transmission signal to the second transformer and coupling the first split received signal to the third transformer and wherein the second switch switches between coupling the second split transmission signal to the second transformer and coupling the second split received signal to the third transformer.