Patent ID: 6987950

Claim:
An apparatus, comprising: an antenna; a receiver; a duplexer having an antenna port coupled to the antenna and a receiver port coupled to the receiver; a bypass path between the antenna and the receiver; and a switching circuit configured to switch the antenna between the duplexer and the receiver, the switching circuit being further configured to couple the receiver to the duplexer when the antenna is switched to the duplexer, and to disconnect the receiver from the duplexer when the antenna is switched to the receiver, the switching circuit comprising, a bypass switch between the bypass path and ground, an antenna switch between the antenna port and the ground, a receiver switch between the receiver port and the ground, a first transmission line between the antenna and the antenna port, a second transmission line between the receiver and the receiver port, a third transmission line in the bypass path having a first end coupled to the antenna and a second end, and a fourth transmission line in the bypass path having a first end coupled to the receiver and a second end coupled to the second end of the third transmission line, wherein the bypass switch is connected between the second ends of the third and fourth transmission lines and the ground.