Radio Absorbing Structure Based on Arrays of Resistive Squares

A periodic structure consisting of plane arrays of resistive squares located in a dielectric layer on a metal mirror is considered. On the basis of the solution of the problem of diffraction of a normally incident electromagnetic wave by this structure, the optimal structure parameters that provide for the minimal reflection coefficient in a given wavelength range are calculated. It is shown that, when the number of arrays is up to three, the approximate calculation of the reflection coefficient of a fine-meshed structure can be performed using the method, in which the arrays are matched with films that have the effective surface resistance calculated on the basis of the solution of the quasi-static problem. It is also shown that the optimized investigated structure has the reflection level that is lower than the reflection level of the optimized known structure based on resistive films.