Patent ID: 8164400
Filing Date: 2012-04-24
Classification: H01P

Abstract:
1. A distributed constant type filter comprising: a substrate including a plurality of laminated pre-preg layers, each pre-preg layer including a part made of a first dielectric material having a first relative dielectric constant and a different-material part made of a second dielectric material having a second relative dielectric constant different from the first relative dielectric constant; a filter pattern formed on a top surface of the substrate; and a ground pattern formed on a bottom surface of the substrate; wherein a part of the filter pattern is formed on the different-material part, wherein the filter pattern includes a ring part and an open stub part connected to the ring part, the open stub part is formed on the different-material part, the first dielectric material consists of an epoxy resin, and the second dielectric material consists of a single compound dielectric material, wherein the first dielectric material and the second dielectric material of each pre-preg layer form a separate coinjected integration, wherein a relative dielectric constant relationship between the first dielectric material and the second dielectric material is satisfied so as to allow the open stub part to have a width which provides greater ease in manufacture.