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An Inline Coaxial Quasi-Elliptic Filter With Controllable Mixed Electric and Magnetic Coupling

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2 Author(s)
Huan Wang ; Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou ; Qing-Xin Chu

Based on the concept of using controllable mixed electric and magnetic coupling to design planar filters in our earlier work, we propose a novel inline coaxial filter, in which the electric and magnetic coupling can be separately controlled. Due to this controllable mixed coupling, the filter can operate with a quasi-elliptic characteristic. By modifying resonator structure and inserting additional coupling components, the filter size is substantially reduced and the coupling becomes more easily controllable, thus being able to produce a highly selective filter with a compact size. In addition, asymmetric response can be easily achieved. For the N-order filter, a maximum of N - 1 finite transmission zeros can be realized.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:57 ,  Issue: 3 )