SWITCH CIRCUIT AND COMPOSITE HIGH FREQUENCY ELEMENTS

摘要

A switch circuit, which selectively connects an antenna side circuit to the receiver circuit or transmitter circuit of one of two communication systems, comprises first and second switch parts including two switching elements. The first switch part has a first inductance element located between a port for connection to the antenna side circuit and a port for connection to the second switch part. The second switch part has a second inductance element located between a port for connection to the first switch part and a port for connection to the receiver circuit of the first communication system. The characteristic impedance of the transmission line forming the first inductance element is lower than that of the transmission line forming the second inductance element.