Patent ID: 8816796
Filing Date: 2014-08-26
Classification: H01P,H03H

Abstract:
1. A multilayer filter comprising: a laminate including a plurality of dielectric layers stacked on each other; an unbalanced terminal; a first balanced terminal; a second balanced terminal corresponding to the unbalanced terminal; and a filter circuit; an unbalanced-side inductor connected between the unbalanced terminal and a ground; and a balanced-side inductor electromagnetically coupled with the unbalanced-side inductor, the balanced-side inductor including a first end connected to the first balanced terminal and a second end connected to the second balanced terminal; wherein the balanced-side inductor includes a coil electrode provided in an inner layer of the laminate and having a substantially helical shape; the coil electrode constituting the balanced-side inductor is connected at a predetermined position along a winding direction thereof to the ground through an electrode provided to connect to the ground; the coil electrode constituting the balanced-side inductor includes an odd number of coil electrode portions including at least three coil electrode portions connected in series; and each of the at least three coil electrode portions is disposed on one of the plurality of dielectric layers that does not contain another of the at least three coil electrode portions.