In this thesis, the transmission power of conducting screen perforated periodically with rectangular apertures of finite thickness is calculated in the case of H polarized plane wave incidence.
Finete thickness apertures are very similar to short length waveguides, so the sacttering problem by the conducting screen is able to be translated the scattering by the waveguides which have two discontinuity junctions. therefore it is possible to use the Generalized Scattering Matrix Technique (GSMT) for this problem, which is well known technique for waveguide discontinuites.
Aperture electric field and equivalent current of canonical geometry are expanded by waveguide modes, then using the spectral moment method (MM), mode coefficients of equivalent current are calculated. And then, the scattering matrix and total scattering matrix are obtained from the mode coefficients. Lastly, total equivalent current and total transmission field of the problem which is represented by the total scattering matrix are calculated.
