Duplexer, duplexer device, quadplexer and quadplexer device

摘要

A duplexer topology with improved electrical properties that is compatible with carrier aggregation modes is provided. The duplexer includes a transmit filter between an input port and a common port and a receive filter between the common port and an output port. An impedance matching circuit is connected between the reception filter, the transmission filter and the common port. A matched impedance for transmit and receive signals of a first transmit frequency band is provided at the common port, and an idle impedance is presented for transmit and receive signals of a second transmit frequency band.