THIN FILM TYPE COMMON MODE FILTER

摘要

PROBLEM TO BE SOLVED: To provide a thin film type common mode filter capable of increasing a self-resonant frequency, and sharply reducing a parasitic capacitance while maintaining filtering performance as a common mode filter.SOLUTION: A thin film type common mode filter includes: a base substrate 10 constituted of insulating materials; a first insulating layer 20 formed on the base substrate; an internal electrode 30 formed in one layer on the first insulating layer in which two coil electrodes are formed so as to be in parallel along a coil winding direction in one layer with a simultaneously coil pattern; a second insulating layer 40 formed on the internal electrode so as to be higher than an interval between coils; an external electrode terminal 50 constituted of a vertical section connected on the side face of the internal electrode and a horizontal section horizontally extended from the upper end of the vertical section to form a parallel surface isolated from the internal electrode by a predetermined distance; and a ferrite resin layer 60 formed such that the first insulating layer, the second insulating layer and a part of the side wall of the horizontal section of the external electrode terminal are stored.