Duplexer, communication module component, and communication device

摘要

A duplexer has an antenna terminal, a first terminal, and second terminals and provided with a first filter arranged between the antenna terminal and first terminal and including a parallel resonator for forming a ladder type filter circuit, a second filter arranged between the antenna terminal and the second terminal and having a passband higher than a passband of the first filter, and an electromagnetic coupling element arranged between the parallel resonator of the first filter and a ground part and electromagnetically coupled with the antenna terminal.

主权项

1. A duplexer, comprising:
a ladder type first filter located between an antenna terminal and a first terminal, and having a parallel resonator between a line for connecting the antenna terminal and the first terminal and a ground part; a second filter located between the antenna terminal and a second terminal, and having a passband higher than a passband of the first filter; a first electromagnetic coupling element located on an opposite side of the line with respect to the parallel resonator and between the parallel resonator of the first filter and the ground part, and electromagnetically coupled with a portion of a wiring pattern connecting the antenna terminal and the first filter; and a second electromagnetic coupling element electrically connected to the parallel resonator of the first filter and electromagnetically coupled with the antenna terminal.