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A New Approach to Canonical Dual-Mode Cavity Filter Design

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3 Author(s)
Bekheit, M. ; Dept. of Electr. & Comput. Eng., Queen''s Univ., Kingston, ON ; Amari, S. ; Seyfert, F.

This paper presents a new approach to the design of canonical dual-mode cavity filters within representation theory. Instead of the folded canonical coupling matrix, which results from using the resonances of the empty cavities as a basis, a representation based on the resonances of the cavities with all perturbations present is used. The resulting coupling matrix takes the form of a cul-de-sac configuration. For canonical dual-mode filters with a symmetric response, it allows direct design of the entire structure, except of the input cavity that requires optimization. A sixth-order filter with two symmetrically located transmission zeros is presented to document the validity of the approach. A sixth-order filter with two transmission zeros above the passband is also presented.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:57 ,  Issue: 5 )