Multiple Reflections Method for Diaphragms Polarizers Development

In this paper we apply the method of multiple reflections of electromagnetic waves from inhomogeneities in a waveguide for the development of a polarizer based on diaphragms. Considered technique can be alternatively utilized for fast estimation of the performance of microwave waveguide devices. Comparison with the results obtained by the wave matrix method is presented in the paper. Two mentioned methodswere used to obtain general expressions for complex reflection and transmission coefficients of a waveguide microwave device for polarization conversion. In order to test the theoretical approach weinvestigated a polarizer with two reactive diaphragms in a waveguide with a square cross section. The analytical expressions were obtained for all elements of the scattering matrix of the waveguide polarizer. Applying the obtained expressions, the main electrical parameters of the device were investigated in the operating frequency range of 9–10 GHz. The parameters under study included: phase difference between the waves with orthogonal polarizations, voltage standing wave ratio, reflection coefficient, transmission coefficient, ellipticity factor, cross-polarizationisolation. Theresults obtained by the method of multiple reflections are in good agreement with the results of the wave matrix method.