Patent ID: 7544427

Claim:
A woody electric-wave-absorbing building material comprising: two or more woody plates composed of natural wood or a processed woody material; a magnetic layer composed of an adhesive containing a ferrite powder interposed between two of the woody plates, wherein the magnetic layer contains a nonmagnetic austenite stainless steel powder in an amount in the range of 30 to 50 volume percent relative to a Mn—Zn ferrite powder, the total volume content of the ferrite powder and the nonmagnetic austenite 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 1.0 to 4.0 mm, and the electric-wave-absorbing building material has an electric wave absorption characteristic in which the center frequency of the electric waves absorbed lies in the range of1 to 8 GHz and the amount of electric wave absorption is 20 dB or more in a 2.45 GHz frequency band.