In this paper, the theoretical consideration is described on the thin and single layer radio-wave absorber. And the designing chart are drawn accoding to the theoretical formula. The necessary condition are generally as following, that is, the impedance of single layer absorber equal to free space impedance at the boundary surface and the energy is spent perfectly while propagating in the absorber. The experimental results are almost agree-able to the theoretical calculated too, and is compared to the experimental result.
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