Cross-Entropy Method for Combinatorial Mixed-Parameter Optimization of Waveguide Polarizers for Ku-Band

In this work, a cross-entropy (CE) method-based combinatorial mixed parameter optimization approach is successfully implemented to design a wideband waveguide polarizer for Ku-band applications. Technically, the choice of permittivity and corresponding width of dielectrics required to load the walls of the waveguide polarizer to produce an optimum design remains a severe challenge. We classify this as an optimization problem and address it using the CE method. The dielectric loading on the walls of a square waveguide polarizer is optimized to achieve a broader bandwidth and an axial ratio (AR) below 0.2 dB. The CE algorithm coded in MATLAB in conjunction with the full-wave simulations in CST MWS is implemented to increase the AR bandwidth and reduce the overall length of the polarizer.