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Canonical ridge waveguide filters in LTCC or metallic resonators

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5 Author(s)
Ruiz-Cruz, J.A. ; Dept. de Electromagnetismo y Teoria de Circuitos, Univ. Politecnica de Madrid, Spain ; Sabbagh, M.A.E. ; Zaki, K.A. ; Rebollar, J.M.
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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.

Published in:

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

Date of Publication:

Jan. 2005

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