Patent ID: 7778208

Claim:
A wireless communication system for time division duplex comprising: a bidirectional frequency conversion unit bidirectionally converting a receiver (Rx) signal and a transmitter (Tx) signal, and including a first connection terminal connected to an Rx input terminal and a Tx output terminal, and a second connection terminal; a common intermediate frequency (IF) circuit unit processing an Rx signal input through the second connection terminal of the bidirectional frequency conversion unit or a Tx signal input through a Tx input terminal; an Rx switching circuit unit switched ON in an Rx operation, and including a first Rx switch connected between the Rx input terminal and the first connection terminal of the bidirectional frequency conversion unit, a second Rx switch connected between the second connection terminal of the bidirectional frequency conversion unit and an input terminal of the common IF circuit unit, and a third Rx switch connected between an output terminal of the common IF circuit unit and an Rx output terminal; and a Tx switching circuit unit switched ON in a Tx operation, and including a first Tx switch connected between the Tx input terminal and the input terminal of the common IF circuit unit, a second Tx switch connected to a bypass path connecting the input terminal of the common IF circuit unit with the output terminal of the common IF circuit unit, and a third Tx switch connected between the first connection terminal of the bidirectional frequency conversion unit and the Tx output terminal, where in the Rx switching circuit unit and the Tx switching circuit unit operate in a time-division manner.