A novel technique for improving the performance of Salisbury screen

The most common and simple structure to reduce the level of the reflected power from a metallic surface is the single layer structure known as Salisbury screen which is a sheet of porous material impregnated with graphite and spaced a quarter-wavelength off a metallic backing plate. The main disadvantage of this mechanism is the narrow frequency bandwidth. Many techniques have been reported to improve the working frequency bandwidth but with some degradation in the other technical properties of the overall structure. In this paper a novel technique has been introduced based on a spatial kind of material called the circuit analog screen. Theoretical analysis shows that the bandwidth of the reflected power will be improved if the graphite sheet of the Salisbury screen has been loaded by circuit analog screen with spatial geometry with spatial parameters.