To obtain a radio wave absorbent which is lessened in weight and enhanced in radio wave absorbing efficiency, by a method wherein a large number of long carbon fibers specified in volume resistivity are arranged in order in a lengthwise direction and bound together with resin into a carbon fiber bundle of continuous length, and the carbon fiber bundles are arranged in parallel at a certain interval to from a low-resistance film layer, a dielectric layer is provided to the rear of the low-resistance film layer, and a reflecting layer is provided to the rear of the dielectric layer for the formation of a radio wave absorbent.
A large number of long carbon fibers of volume resistivity 10-4 to 104Ω.cm are arranged in order in a lengthwise direction and bound together with resin into a carbon fiber bundle of continuous length, and the carbon fiber bundles are arranged in parallel at a certain interval to from a low-resistance film layer 2, and a dielectric layer 3 of concrete or cement mortar integrally formed is to the rear of the low-resistance film layer 2. Furthermore, reinforcing steel bars extending at right angles with the low-resistance film layer 2 and the dielectric layer 3 are provided as joined to serve as a reflecting layer for the formation of a reinforced assembly. By this setup, a radio wave absorbent light in weight and excellent in radio wave absorbing properties can be obtained.
NAKAMURA MORIYASU
HATAJIMA HITOSHI
WAKAMATSU KOICHI
YAMAUCHI KAZUHIRO
