TE characterization of resistive strip gratings on a dielectric slab using a single edge-mode expansion

The authors present an efficient analysis and characterization of narrow resistive strip arrays residing on a dielectric substrate. Simple closed-form formulas for mode reflection and transmission coefficients of the resistive grating on a substrate are presented. This is accomplished by employing a single physical basis or edge mode to represent the strip current. The periodic Green´s function is derived using the procedure employed by K. Sarabandi (1990), and the resulting series has a relatively fast convergence. A careful study is done to establish the accuracy bounds of the physical basis expansion and the resulting mode coefficients. From the derived closed-form formulas, equivalent sheet boundary conditions and equivalent circuit parameters are given for a complete characterization of the grating.<>