NOISE FILTER, PRINTED CIRCUIT BOARD, AND CABLE

摘要

PROBLEM TO BE SOLVED: To provide a noise filter capable of relaxing limitation of a mounting position and obtaining enough noise reduction effect upon mounting the filter in a high frequency band. SOLUTION: A filter module 100 includes therein a plurality of filter circuits 111, 112 and a transmission line 130 for connecting the filter circuits 111, 112. The filter circuits 111, 112 are disposed to each other at the length of 1/4 of the wavelength of an electromagnetic wave calculated from frequencies of noise taken as a removal object by the noise filter at a distance along the transmission line 130. COPYRIGHT: (C)2009,JPO&INPIT