Patent ID: 6956173

Claim:
A wiring board, comprising: a board of at least one layer comprising a conductor part, said conductor part comprising-signal line conductor patterns and having a ground part that is either a ground surface or has ground patterns deployed on one surface of said board, an entire surface of said ground part being covered with a magnetic thin film, wherein said magnetic thin film is configured of a magnetic loss material represented by M-X—Y, where M is at least one of Fe, Co, and Ni, Y is at least one of F, N, and O, and X is at least one element other than M or Y, said magnetic loss material has a maximum value μ″ max of loss factor μ″ that is imaginary component in complex permeability of said magnetic loss material existing within a frequency range of 100 MHz to 10 GHz; said magnetic loss material is a broad-band magnetic loss material having a relative bandwidth bwr not smaller than 150% where the relative bandwidth bwr obtained by extracting a frequency bandwidth between two frequencies at which the value of μ″ is 50% of the maximum μ″ max and normalizing the frequency bandwidth at the center frequency thereof; and said magnetic thin film deployed at least on part of said board or said conductor part.