Optimal Design of Wideband Bandpass SIW Filters for 5G Millimeter-Wave Applications

Two wideband bandpass filters for the two 5G millimeter-wave bands of 24.75-27.5 GHz and 37-42.5 GHz are presented. The filter is based on substrate integrated waveguide (SIW) and the parallel inductance is realized by metal through-hole. Because of the theoretical size of first hole is too small, a bias distance of the hole is given to make the diameter meet the criterion. Then, machine learning-assisted optimization (MLAO) is used to optimize the two filter models. Finally, simulation results show that the optimized filters can meet the requirements of 5G Millimeter-Wave Applications.