Planar Quasi-Elliptic Filters with Inline EM Coupled Open-Loop Resonators
作者： Qing-Xin Chu , Huan Wang
DOI: 10.1109/IMWS.2008.4782258
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摘要: This paper describes the planar quasi-elliptic filters with EM coupled open-loops having an inline resonator alignment. For two open-loops, sides maximum magnetic field are combined their open gaps electric field, creating mixed and coupling. By adjusting distance between this loops gap position of each loop, a desired coupling coefficient controllable transmission zero can be simultaneously obtained. The shapes open-loop either rectangle or triangle, but latter is preferred to former since triangular pairs tighter more controllable. A backed aperture etched on ground plane underneath lines adjacent further enhance both coupling, help realize wider bandwidth closer-to-passband zero. High order constructed by cascading several create multiple zeros.
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