BANDPASS FILTER, AND WIRELESS COMMUNICATION MODULE AND WIRELESS COMMUNICATION DEVICE USING THE BANDPASS FILTER

摘要

Provided are a bandpass filter that can be used for broadband and provides a large degree of freedom in designing the passband, and a wireless communication module and a wireless communication device using the bandpass filter. The bandpass filter comprises: first to third resonance electrodes (31a, 13b, 13c) constituting first to third resonators, which are disposed sequentially side-by-side in the manner of an electromagnetic field coupling and each of which has one end grounded; a first input/output coupling electrode (40a) facing the first resonance electrode (31a) so as to provide electromagnetic field coupling; a second input/output coupling electrode (40b) facing the second resonance electrode (31b) so as to provide electromagnetic field coupling; and a resonator coupling electrode (43) for electromagnetic coupling of the first resonance electrode (31a) and the third resonance electrode (31c). The resonant frequencies of the first and second resonators are equal to each other and are different from the resonant frequency of the third resonator, and the bandpass filter forms a passband using the first to third resonators. The bandpass filter can be used for broadband and provides a large degree of freedom in designing the passband.