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Novel E-plane filters and diplexers with elliptic response for millimeter-wave applications

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3 Author(s)
Ofli, Erdem ; Lab. for Electromagn. Fields & Microwave Electron., Swiss Fed. Inst. of Technol., Zurich, Switzerland ; Vahldieck, R. ; Amari, S.

A new class of E-plane filters based on cross-coupled resonators or over-moded cavities is introduced. The filters exhibit pseudoelliptic transfer functions with steep attenuation slopes. The metal inserts and separating wall between waveguide sections can be fabricated using electro-deposition techniques with the accuracy required for millimeter-wave applications. The filters are mass-producible, are much shorter than traditional E-plane filters, and have less insertion loss. Based on this new type of E-plane filter, highly compact diplexer structures are designed. A comparison between prototype filters and design prediction shows excellent agreement.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:53 ,  Issue: 3 )