Duplexer, and laminate-type high-frequency device and communication equipment using the same

摘要

The duplexer has transmitting filter and receiving filters provided in a laminate with different pass band frequencies. A matching circuit has a coupling line (9), with one end that is short circuited and another end connected to an external terminal, provided between the filters. Strip line resonators (3b, 4a) of respective filters are coupled to the coupling line by electromagnetic field coupling. An independent claim is also included for a laminate-type high-frequency device.