[object] Various electric wave absorbers for the GHz band have been
developed. However, parameters for obtaining the optimal electric wave
absorption characteristic are only the shape and the content of a
dielectric material or a conductive material, and the degree of freedom
of the parameters has been small. Furthermore, in a recent wireless LAN,
electric wave absorbers that can be used for absorbing potentially
dangerous electric waves in a plurality of bands, for example, in two
frequency bands of 2.45 GHz band and 5.2 GHz band, have also been
desired.
[Solving Means] In a woody electric wave absorber including a laminated
magnetic woody material prepared by bonding facing plates composed of
natural wood or a processed woody material with a magnetic layer composed
of an adhesive containing a ferrite powder therebetween under pressure,
the magnetic layer contains a nonmagnetic stainless steel powder in an
amount in the range of 20 to 80 volume percent relative to the ferrite
powder, the total volume content of the ferrite powder and the
nonmagnetic stainless steel powder in the magnetic layer is in the range
of 10% to 40%, the thickness of the magnetic layer is in the range of 0.5
to 5.0 mm, and the woody electric wave absorber has an electric wave
absorption characteristic in which the center frequency of the electric
waves absorbed lies in the range of 1 to 8 GHz and the amount of electric
wave absorption is 10 dB or more in a 2.45 GHz frequency band or a 5.2
GHz frequency band.