| 摘要 |
PROBLEM TO BE SOLVED: To obtain a radio wave absorption material that can absorb a wide range of radio wave. SOLUTION: In a radio wave absorption material 30, an absorption layer 32 is laminated on a reflection layer 12. In inclination structure of the radio wave absorption material 30, the absorption layer 32 is formed by applying paint where magnetic particles 16 and 18, a reflection particle 34, a binder 20, and a solvent are blended. Until the paint is hardened, the magnetic particles 16 and 18 and the reflection particle 34 are allowed to settle according to the difference of each specific gravity, the concentration of the magnetic particle 16 is relatively high near the reflection layer 12, and that of the magnetic particle 18 is high at an upper-layer side as compared with the reflection layer 12. The magnetic particles 16 and 18 absorb an effective frequency band, thus efficiently absorbing a radio wave in a wide frequency range. The radio wave being allowed to enter is reflected by the reflection particle 34 at a reflection angleθ2 being large thanα1, and is subjected to reflection for a plurality of times, thus lengthening the traveling distance of the radio wave in the absorption layer, and hence increasing absorption efficiency.
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