Patent ID: 7688765

Claim:
A Time Division Duplex (TDD) switch in a wireless communication system, comprising: an isolator connected to an output port of a transmitter; a first transmission line connected between the isolator and an antenna feed line, for transmitting a transmission signal received from the isolator to the antenna feed line when in a transmission mode and for isolating a transmission path when in a reception mode; a first transmission line stub connected in a stub form between the isolator and the first transmission line for reflecting a transmission signal transmitted from the isolator in the transmission mode and for changing an impedance of the first transmission line in the reception mode; a second transmission line connected between an output port of the first transmission line and an input port of a receiver for isolating a reception path in the transmission mode and for providing a reception signal received from the antenna feed line to the receiver in the reception mode; and a second transmission line stub connected in a stub form between the second transmission line and the input port of the receiver, for controlling the second transmission line to isolate the reception path when in the transmission mode and for supplying the reception signal provided from the antenna feed line to the receiver when in the reception mode.