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A hybrid mode-matching 0 I method-ofmoment (MOM) technique is presented for the efficient CAD and optimization of circular combline fflters involving more general elements like corrugated circular post and reentrant resonators. Using the free-space Green's function, the proposed technique combines the high flexibility of the MOM with the efficiency of the MM method. A locally refined adaptive tiangular surface mesh and the application of R a e Wilton-Glisson (RWG) basis functions achieve the reliable modeling of arbitrarily shaped structures. The building blocks are combined by the generalized scattering matrix (GSM) allowing typical MM elements like irises to be efficiently included. The attractive feature of the proposed method is its short computation time (order of a few seconds per frequency point) achieving the full-wave optimization of such fdters within reasonable times. The high versatility of the hybrid method is demonstrated at examples of practical interest; its efficiency and accuracy is verified by available measurements.

A combined electric field integral (EFIE) Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) surface integral equation technique is presented, in which exclusively Rao-Wilton-Glisson (RWG) functions are used for basis functions. This yields the accurate analysis of coaxfed dielectric resonator filters. The advantage of the proposed method against existing approaches is its higher efficiency and flexibility. The versatility and accuracy of the method are verified by comparison with measured results.

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