Filter, communication module, and communication apparatus

摘要

A filter includes a substrate; a signal line formed on the substrate and including an input terminal (1) and an output terminal (4) at either end of the signal line; and a first pair of resonant lines (2b, 2c) connected between the signal line and a ground portion, wherein the first pair of resonant lines (2b, 2c) are connected to the signal line at the same point (3).