Filter device, and antenna module and communication device including the same

Abstract

A filter device (130) is formed between an input end (T1) and an output end (T2), and is configured to attenuate a radio frequency signal in a specific frequency band. The filter device (130) includes a dielectric substrate (140) having a multilayer structure, ground electrodes (GND1 and GND2) formed in the dielectric substrate (140), a first coupling line (132) electrically connected to the input end (T1), a second coupling line (134) electrically connected to the output end (T2), and a stub (133) connected to the first coupling line (132) and the second coupling line (134). The first coupling line (132) and the second coupling line (134) are formed in layers different from layers of the ground electrodes (GND1 and GND2). The first coupling line (132) and the second coupling line (134) are disposed in different layers so as to face each other.

Dependencies are inferred from the claim text.