Efficient moment method for ultra-wideband scattering from finite array of perfectly conducting and resistive strips on grounded dielectric slab

Ultra wideband (UWB) TE plane wave scattering from large but finite resistive strip grating on grounded dielectric substrate is analysed in the frequency domain. A closed analytical form of the spectral Green´s function is used to relate the currents and fields on strips and the resulting integral equation is solved using method of moments. To make this procedure practical under UWB conditions, closed form expressions are derived for mutual coupling terms for strips separated by 0.1 wavelengths or more. This coupled with the interpolation technique used for the impedance self terms dramatically reduces CPU time and makes the analysis tractable. Extensive tests have been done for TE and TM incident polarisation for strips loaded with grounded dielectric or without ground plane or in a free space. Obtained results are in a very good agreement with the data in the open literature. In this paper results for TE scattering width are presented for an array of ten perfectly conducting and resistive strips on a grounded dielectric slab.