Patent ID: 7889121

Claim:
A transmit/receive module having a transmit line and a receive line, comprising: a transmit input terminal for inputting a transmit input signal; a receive output terminal for outputting a receive output signal; a transmit output/receive input terminal for outputting a transmit signal and receiving a receive signal; a first branch device connected to the transmit input terminal; a transmit/receive separator connected to the first branch device; a second branch device connected to the transmit/receive separator; a third branch device connected to the first branch device and the second branch device; and a fourth branch device connected to the third branch device, the receive output terminal and the transmit/receive separator; wherein the first branch device, the second branch device, the third branch device, the fourth branch device and the transmit/receive separator are configured so that when the transmit line is monitored, a signal inputted to the transmit input terminal is outputted to the receive output terminal through the first branch device, the transmit/receive separator, the second branch device, the third branch device and the fourth branch device in order, and when the receive line is monitored, the signal inputted to the transmit input terminal is outputted to the receive output terminal through the first branch device, the third branch device, the second branch device, the transmit/receive separator, and the fourth branch device in order.