Patent ID: 8155037
Filing Date: 2012-04-10
Classification: H04B

Abstract:
1. A transmitter and receiver apparatus operable to transmit signals from a common antenna during a transmitting period and to receive signals through the common antenna during a receiving period in a time divisional manner, the transmitter and receiver apparatus comprising: a first directional coupler having a first, a second, a third, and a fourth port, the first port for receiving a signal, the second port for outputting a first signal, the third port for outputting a second signal, the first and the second signals being of phase difference by 90 degrees to each other, and the fourth port being terminated in a predetermined impedance; a first switch including a first input terminal coupled to the second port for receiving the first signal, a first output terminal, and a second output terminal, for switching between a first state during a passage mode in which the first input terminal is coupled to the first output terminal and a second state during a block mode in which the first input terminal is coupled to the second output terminal; and a second switch including a second input terminal coupled to the third port for receiving the second signal, a third output terminal, and a fourth output terminal, for switching between a third state during the passage mode in which the second input terminal is coupled to the third output terminal and a fourth state during the block mode in which the second input terminal is coupled to the fourth output terminal.