Dimensional synthesis of wide-band waveguide filters without global optimization

Abstract

This Ph.D. dissertation presents a dimensional synthesis method for the design of wide-band filters without resorting to global full-wave optimization. The wide-band filters include direct-coupled waveguide filters, in-line pseudo-elliptic waveguide filters and cross-coupled waveguide filters. The type of the wide-band filters cover not only half-wavelength-resoantor filters, but also quarter-wavelength-resonator filters. After literature survey is summarized, a new mapping method, edge frequency mapping method, is proposed for the synthesis of wide-band bandpass filters. Then we apply it to the design of direct-coupled waveguide filters and propose a dimensional synthesis method without global full-wave optimization, in which an improved full-wave model for the waveguide iris and an iteration design procedure are employed.