Patent ID: 9093736
Filing Date: 2015-07-28
Classification: H01F,H01P,H03H,H04B

Abstract:
1. A common mode filter, comprising: a first insulator sheet; a first circuit layer formed on the first insulator sheet and having a first-layered first coil and a first-layered second coil alternately and separately arranged; a second insulator sheet laminated on the first circuit layer and having a pair of penetration hole rows constituted of a plurality of penetration holes connected to the first-layered first coil and the first-layered second coil; and a second circuit layer formed on the second insulator sheet and having a second-layered first coil and a second-layered second coil alternately and separately arranged, the second-layered first coil being connected to the first-layered first coil and the second-layered second coil being connected to the first-layered second coil through the plurality of penetration holes, wherein the second insulator sheet is formed of a photosensitive material, and an impedance of the common mode filter is controlled by a thickness of the first insulator sheet, and wherein the first insulator sheet is formed of any one of polyimide, epoxy resin, benzo cyclobutene (BCB), and other polymers.