Patent ID: 6862441

Claim:
A method of filtering transceiver signals in a mobile terminal, the mobile terminal operable in at least one transmit frequency band and one receive frequency band separated from the transmit frequency band, wherein the mobile terminal has a signal source for providing transmit signal in the transmit frequency band, said method comprising the steps of: providing a signal path between the signal source and an antenna; and providing a band-reject filter in the signal path so as to attenuate signal in the receive frequency band, wherein the band-reject filter comprises: at least one series resonator operatively connected between the signal source and the antenna, the series resonator having a first end and an opposing second end, with the first end connected to the signal source; at least one shunt resonator connecting between the second end of the series resonator and a grounding point, the shunt resonator and the series resonator forming an L-section; and at least one inductor connected in parallel with the L-section.