Design on open-loop bandpass filter with multiple harmonics suppression

Design on open-loop bandpass filter with multiple harmonics suppression

Автор: Liu He, Xing-Jian Zhong, De-Xin Qu, Zhen-Dong Fan, Kai Shi

Журнал: International Journal of Wireless and Microwave Technologies @ijwmt

Статья в выпуске: 5 Vol.8, 2018 года.

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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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Harmonic suppression, bandpass filter, coupling structure, open-loop resonator

Короткий адрес: https://sciup.org/15016944

IDR: 15016944   |   DOI: 10.5815/ijwmt.2018.05.04

Список литературы Design on open-loop bandpass filter with multiple harmonics suppression

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