Patent ID: 7671706

Claim:
A multilayer bandpass filter having a multilayer structure comprising: a plurality of dielectric layers; and a plurality of electrode layers each having at least one of a capacitor electrode and an inductor electrode; wherein at least three LC parallel resonators are defined by the capacitor electrodes and the inductor electrodes such that adjacent LC parallel resonators are coupled with each other; the multilayer bandpass filter includes a single input electrode and a single output electrode, the input electrode being electrically connected to one of the at least three LC parallel resonators that is located at an input side, and the output electrode being electrically connected to another of the at least three LC parallel resonators that is located at an output side; the inductor electrode of each of the at least three LC parallel resonators are arranged to form a loop such that the loop extends starting from a node between one end of the inductor electrode and the capacitor electrode of each of the at least three LC parallel resonators, and such that when seen in a direction in which the inductor electrodes are arranged, a loop plane of the loop of the inductor electrode of each LC parallel resonator at least partially overlaps a loop plane of the loop of the inductor electrode of an adjacent LC parallel resonator thereby coupling these LC parallel resonators; and a direction of the loops of the inductor electrodes of the at least two of LC parallel resonators is opposite to each other when seen in a direction in which the inductor electrodes are arranged.