Patent ID: 6977564

Claim:
A bandpass filter comprising: a dielectric substrate; a resonator electrode provided on a portion of a plane at an intermediate height in the thickness direction of the dielectric substrate so as to oppose a top surface of the dielectric substrate and includes an aperture; first and second ground electrodes arranged over and under the resonator electrode, respectively, in the thickness direction of the dielectric substrate so as to oppose the resonator electrode with dielectric layers disposed therebetween and so as to sandwich the resonator electrode; input-output coupling electrodes coupled to the resonator electrode; input-output terminal electrodes provided on the outside surface of the dielectric substrate and being electrically connected to the input-output coupling electrodes; and a via-hole electrode that penetrates through the aperture in the thickness direction of the dielectric substrate so as not to be electrically connected to the resonator electrode and that is electrically connected to the first and second ground electrodes.