Patent ID: 6953899

Claim:
A wiring board, comprising: an insulative base material; conductor patterns formed thereon; a magnetic thin film formed on at least one of said conductor patterns and configured of a magnetic loss material, said magnetic loss material having a composition represented by M—X—Y, where M is at least one of Fe, Co and Ni, X is at least one element other than M or Y, and Y is at least one of F, N and O, in which a maximum value μ″ max of loss factor μ″ that is the imaginary component in complex permeability characteristic of said magnetic loss material exists within a frequency range of 100 MHz to 10 GHz and said magnetic loss is a narrow band magnetic loss material having a relative bandwidth bwr not greater than 200% where the relative bandwidth bwr is 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 being formed with an insulation layer interposed therebetween that covers the entirety of the surface of said wiring board on which said conductor patterns are formed.