Patent ID: 8493894

Claim:
A radio frequency (RF) front-end circuit, comprising: a multiband antenna; an antenna switch including an antenna pin, a plurality of receiving pins, a plurality of transmitting pins, and a plurality of control pins; a duplexer; a communication mode selection switch connected to the multiband antenna, the antenna switch, and the duplexer, the communication mode selection switch including a control end; and a processor connected to the control pins of the antenna switch and the control end of the communication mode selection switch respectively, wherein the processor controls the communication mode selection switch to selectively connect the antenna switch or the duplexer to the multiband antenna through the control end; when the multiband antenna is connected to the antenna switch, the processor controls the antenna switch to transmit wireless signals in a plurality of frequency bands used in a first wireless communication system through the control pins, wireless signals in one of the plurality of frequency bands received by one of the receiving pins, wireless signals in two of the plurality of frequency bands sent from the multiband antenna by one of the transmitting pins; and when the multiband antenna is connected to the duplexer, the duplexer transmits wireless signals used in a second wireless communication system received by or sent from the multiband antenna.