Full wave optimization is implemented to design a wide band transition from shielded stripline to ridge waveguide.A bandpass ridge waveguide filter, with input/output realized through tapped-in stripline is designed.Using rigorous mode matching technique the generalized scattering matrices of all the building blocks are obtained.Design procedure is described and examples are given to demonstrate the features of the tapped-in coupling structure.The tapped-in structure results in a considerable reduction of the filter's total length compared to the use of two transitions.

A bandpass ridge waveguide filter, with input/output realized through tapped-in stripline is designed. Using rigorous mode matching technique the generalized scattering matrices of all the building blocks can be obtained. Design procedure is described and examples are given to demonstrate the features of the proposed coupling structure. The proposed structure shows a considerable reduction of the filter's total length.

This paper uses a new optimization technique for determining the frequency response of waveguide diplexers. The proposed technique is considerably more advantageous than the conventional waveguide filter optimization techniques. The technique uses only six variables in the penalty function irrespective of the orders of the two channel filters. This drastically reduces the chances of convergence to a local minimum as well as the computer storage and processing requirements. Two examples are presented to support the validity of this new technique. This technique will be extremely valuable in designing waveguide multiplexers.

Millimeter wave H-plane diplexers are designed using modified H-plane waveguide T-junctions and modified inductive window bandpass filters. Modeling of the diplexers are performed using full wave mode matching method to obtain the generalized scattering matrices of the building blocks and by cascading procedure to provide the overall frequency response. A complete systematic optimization procedure leads to the desired diplexer design. A millimeter wave K/sub a/ upper band diplexer based on the simulated result was built and tested. Without any tuning, excellent experimental results are obtained, which verified the design approach.

A new configuration of conductor loaded resonator filters using two different sized conductor loaded resonators is presented. The spurious performance of the conductor loaded resonator filters are significantly improved. A rigorous mode matching method is used to compute the resonant frequency, unloaded Q and the field of the resonant mode of the conductor ( solid or ring) loaded resonators. The coupling coefficients between two resonators are computed using small aperture theory by Levy's approach. An 8-pole elliptic function filter is designed, constructed and tested. Experimental results verify the theory.