Abstract
A new wideband wave absorber with translucent structure using carbon fibers is presented in this paper. The absorber is composed of bundled short carbon fibers which are arranged in front of a back metal and a spacer. Absorption characteristics of the one-layered absorber showed that matching frequencies can be controlled by the thickness of the spacer and the length of the carbon fibers. To further improve the characteristics, multi-layered absorbers are designed with the same procedure as one-layered absorber. The designed absorber showed 15dB absorption characteristics from 1.0 to 10.0GHz. Then a small anechoic chamber with the inside dimension of 200cm × 200cm × 200cm was fabricated using ninety-six proposed absorbers. The electrical power in the chamber was measured at 2.45GHz and the results showed that the variation of the power was less than 4dB inside a circle with radius of 60cm as work space for electromagnetic measurements.
