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CAD of T-septum waveguide evanescent-mode filters

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2 Author(s)
Labay, V.A. ; Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada ; Bornemann, J.

A mode-matching-based design for an evanescent-mode waveguide filters with T-septum shaped metal inserts is presented. Owing to the wideband characteristics of the T-septum waveguide, the proposed design constitutes a significant improvement over common evanescent-mode filters with respect to both size reduction and stopband behavior. The theoretical approach is verified for the example of a three-resonator 8.8-GHz filter prototype of less than 3/4-in length. The second passband is beyond 27 GHz. Since the design procedure takes higher-order mode interactions into account, good agreement between theory and experiment is obtained over the entire measurement range between 8.2 and 40 GHz

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:41 ,  Issue: 4 )