| 摘要 |
PROBLEM TO BE SOLVED: To provide a sheet material for a radio wave absorber which is used for the radio wave absorber attached to a wall surface and a ceiling surface of the anechoic chamber, has an excellent absorbing performance especially for an electric wave of a high frequency band ranging from several GHz to several 10 GHz, is excellent in handleability such as transportability and constructibility on site, and can sample the seat material at high yield, and a radio wave absorber.SOLUTION: A seat material of dodecagonal C is fabricated from a rectangular A as follows. The four vertices of the rectangular A are cut out in right triangle shape to generate an octagonal B. In the octagonal B, there are four pairs of straight lines each connecting corresponding one of the two apexes resulting from the cutting out in one corresponding right triangle shape and an arbitrary point O within the octagonal B. In each pair, the two straight lines have the same length. In the octagonal B, there are also two pairs of opposing sides originating from the respective sides of the starting shape, rectangular A, and the opposing sides in each pair have the same length. At each of those four sides of the octagonal B resulting from the cutting out in the corresponding right triangle shape, an isosceles triangle portion with its bottom side equal to that side is cut out from the octagonal B, or added to the octagonal B so that the dodecagonal C is generated. |
