Optimisation of Asymmetrical Bandpass Filters

A numerical method for the optimization of asymmetrical bandpass filters with Chebyshev response is considered. By exploiting the fact that a network based on Chebyshev prototypes has a prescribed number of turning points in the insertion loss and an identical number of independent parameters which can be assigned as variables to adjust their levels the method gives fast convergence. The design of asymmetrical ridged waveguide bandpass filters is considered as example. Measurements on a fabricated filter confirm the accuracy of he design procedure.