近年，急速に拡大する電波利用と共に電波環境は悪化のrn一途を辿り，これを改善するために電波吸収体の必要性はrn益々高まっている。従来，電波吸収体の反射減衰量は遠方rn界に対して評価するのが一般的であるが，測定周波数がrn低い場合や試料寸法が大きい場合には遠方界に対する評価rnが困難となる。%In this paper, the spatial distribution of the reflectivity of an one layered type wave absorber is analyzed by using FDTD method. The reflectivity from the near field to the far field is examined in the case of changing the distance from the surface of the absorber and the size of it. As a result, it is confirmed that the tendency of the reflectivity converges to a steady value in the far field though it shows intricate behavior in the near field. Moreover, the reflectivity is decreased and the difference between the near field and the far field is increased as the size of the absorber becomes smaller.
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