Patent ID: 8482365

Claim:
A multilayer bandpass filter comprising: an elementary body including a laminate including a plurality of dielectric layers and a plurality of electrode layers each including at least one of a capacitor electrode and an inductor electrode, wherein a plurality of LC parallel resonators are each constituted by the corresponding capacitor electrode and the corresponding inductor electrode, and adjacent pairs of the plurality of LC parallel resonators being coupled to each other; a first input/output terminal lead-out electrode to which is coupled a first LC parallel resonator among the plurality of LC parallel resonators arranged at one end of the laminate and which defines an input portion of the multilayer bandpass filter; and a second input/output terminal lead-out electrode to which is coupled a second LC parallel resonator among the plurality of LC parallel resonators arranged at the other end of the laminate and which defines an output portion of the multilayer bandpass filter; wherein the inductor electrodes of the plurality of LC parallel resonators are constituted by line electrodes which are disposed on a surface of and/or within the laminate side by side in a direction perpendicular or substantially perpendicular to a layering direction of the laminate, and by via electrodes which are connected to corresponding ends of the line electrodes and which are extended in the layering direction of the laminate; the inductor electrodes are respectively arranged such that surfaces of loops starting from junctions between the via electrodes and the capacitor electrodes and including the line electrodes are arrayed side by side in the direction perpendicular or substantially perpendicular to the layering direction of the laminate, the loop surfaces overlapping with each other at least partly when the loop surfaces defined by the inductor electrodes of the plurality of LC parallel resonators coupled to each other are viewed in the direction in which the line electrodes are arrayed side by side; the line electrode of the first LC parallel resonator is directly electrically and physically connected to the first input/output terminal lead-out electrode and the line electrode of the second LC parallel resonator is directly electrically and physically connected to the second input/output terminal lead-out electrode; and a line length of the line electrode of the first LC parallel resonator directly electrically and physically connected to the first input/output terminal lead-out electrode is different from a line length of the line electrode of the second LC parallel resonator directly electrically and physically connected to the second input/output terminal lead-out electrode such that impedance conversion is performed between the input portion and the output portion.