| 摘要 |
PROBLEM TO BE SOLVED: To prevent cost from becoming expensive with the complication of a manufacture process and to realize structural correspondence with respect to moisture absorption and flame resistance by jointing a ferrite tile with an upper absorber having a flat form or a wedge form or a pyramid form and permitting the upper absorber to distribute ferrite powders in general-purose resin having a specified relative dielectric constant so as to obtain them. SOLUTION: A composite radio wave absorber 1 is formed of a ferrite tile 2 and a pyramid-type upper absorber 3 above the tile. The upper absorber has a blending where ferrite powders are distributed in a matrix formed of non-polar resin. It is desirable that resin whose frequency is not less than 1MHz and whose relative dielectric constant is not more than 4.9 as resin that can be used. In the blending ratio of the ferrite powders and resin, the upper limit of the blending volume ratio of the ferrite powders is set to be 65 vol.%. The lower limit of the blending volume ratio of the ferrite powders is set to be ferrite powder quantity satisfying the requested absorbing quantity on a harmonic side for 1 GHz maintenance, namely, 10 vol.%. |
