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Canonical ridge waveguide filters in LTCC or metallic resonators

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5 Author(s)
J. A. Ruiz-Cruz ; Dept. de Electromagnetismo y Teoria de Circuitos, Univ. Politecnica de Madrid, Spain ; M. A. E. Sabbagh ; K. A. Zaki ; J. M. Rebollar
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A new physical realization of an elliptic function filter response is proposed for achieving compact size, wide bandwidth, wide spurious free stopband and high-selectivity performance. The filter configuration can be implemented in conventional waveguide technology or embedded in a multilayer low-temperature co-fired ceramic structure for integration with other circuitry in a chip module. The filter is analyzed using rigorous mode matching. To validate the concept, prototypes of four- and six-cavity elliptic filters are designed following a systematic procedure. Approximate synthesis is used to obtain initial dimensions of the filter and the desired optimum response is obtained by means of a final full-wave optimization. The results are verified with other numerical methods and with the measurements of a fourth-order waveguide filter.

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IEEE Transactions on Microwave Theory and Techniques  (Volume:53 ,  Issue: 1 )