Transparent and double-sided wave absorber with specified reflection and transmission coefficients

A double-sided wave absorber with specified reflection and transmission coefficients at both sides is proposed. This wave absorber consists of two transparent dielectric layers with three transparent resistance films. Therefore, this wave absorber is transparent and electromagnetic waves are absorbed in both sides. Then it is suitable for the indoor use as electromagnetic wave separator. The design formula is derived and its effectiveness is confirmed by the numerical examples.