Design on Open-Loop Bandpass Filter with Multiple Harmonics Suppression | Zendy

Liu He | Zendy; Xingjian Zhong | Zendy; Dexin Qu | Zendy; Zhendong Fan | Zendy; Kai Shi | Zendy

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Design on Open-Loop Bandpass Filter with Multiple Harmonics Suppression

Author(s) -

Liu He,

Xingjian Zhong,

Dexin Qu,

Zhendong Fan,

Kai Shi

Publication year - 2018

Publication title -

international journal of wireless and microwave technologies

Language(s) - English

Resource type - Journals

eISSN - 2076-9539

pISSN - 2076-1449

DOI - 10.5815/ijwmt.2018.05.04

Subject(s) - stopband , harmonics , band pass filter , control theory (sociology) , coupling (piping) , filter (signal processing) , topology (electrical circuits) , computer science , loop (graph theory) , electronic engineering , physics , engineering , mathematics , voltage , electrical engineering , control (management) , combinatorics , artificial intelligence , mechanical engineering , computer vision

In this paper, a simple method based on coupling control theory to suppress multiple harmonics in open-loop bandpass filters is proposed. Coupled feeding is utilizing in this paper, and by choosing proper coupling length and position of the input/output port, multiple harmonics could be suppressed. The input impedance of microstrip line with its end open-circuited is firstly showed and the theory on harmonics suppression is then analyzed to choose a proper coupling position. A second-order open-loop bandpass filter is designed and manufactured, measured and manufactured results both have a stopband to 5f0 with rejection more than 20dB. On the base of the filter proposed, the stopband can be broaden to 10f0 by adding two stubs. It well validates the proposed solution.

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