Patent ID: 8923167

Claim:
A communication device, comprising: first filter circuitry connected between a first transceiver and at least one antenna, the first filter circuitry comprising a first duplexer that transmits a first transmit signal in a first transmit frequency band from the first transceiver to the at least one antenna and that transmits a selected one of a first receive signal in a first receive frequency band and a second receive signal in a second receive frequency band; second filter circuitry connected between a second transceiver and the at least one antenna, the second filter circuitry comprising a second duplexer that transmits a second transmit signal in a second transmit frequency band from the second transceiver to the at least one antenna and that transmits another one of the first receive signal in the first receive frequency band and the second receive signal in the second receive frequency band; a diplexer comprising: a first notch filter connected between the first duplexer and the at least one antenna which: transmits signals in the selected one of the first receive frequency band and the second receive frequency band, transmits the first transmit signal in the first transmit band, and attenuates the second transmit signal in the second transmit frequency band, and a second notch filter connected between the second duplexer and the at least one antenna which: transmits signals in the other one of the first receive frequency band and the second receive frequency band, transmits the second transmit signal in the second transmit band, and attenuates the first transmit signal in the first transmit frequency band; and a combining network, connected between an output of the first notch filter, an output of the second notch filter, and the at least one antenna, wherein the combining network adjusts impedances in the first receive frequency band and the first transmit frequency band to couple the first receive signal and the first transmit signal between the first transceiver and the at least one antenna, and adjusts impedances in the second receive frequency band and the second transmit frequency band to couple the second receive signal and the second transmit signal between the second transceiver and the at least one antenna.