Abstract
We present the design and the development of a research method for new microwave waveguide filtering structures with low dimensions and tranmission zeros. An electromagnetic analysis technique is exposed. It permits to characterize all structures composed of rectilinear pieces of rectangular waveguide whose opened areas at the extremities partially overlap. Non shared areas are supposed perfectly conductive and every piece of waveguide is filled with homogeneous isotropic dielectric material. Basic elements are size discontinuities and dielectric discontinuities. We determine the generalized scattering matrix using multimode analysis. Using a lot of modes leads also to reduce dimensions. Coupling of two modes leads to the realization of a zero transmission and improves the selectivity of the filters. Optimization is made using genetic algorithm. In addition to theory, the measured response of a filter is presented and valids the proposed filter concept.
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