DESIGN OF DUAL-BAND BANDPASS FILTER WITH CLOSELY SPACED PASSBANDS AND MULTIPLE TRANSMISSION ZEROS | Zendy

Yang Xiong | Zendy; Li Tian Wang | Zendy; Wei Zhang | Zendy; Fan Zhang | Zendy; Doudou Pang | Zendy; Ming He | Zendy; Xinjie Zhao | Zendy; Lu Ji | Zendy

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DESIGN OF DUAL-BAND BANDPASS FILTER WITH CLOSELY SPACED PASSBANDS AND MULTIPLE TRANSMISSION ZEROS

Author(s) -

Yang Xiong,

Li Tian Wang,

Wei Zhang,

Fan Zhang,

Doudou Pang,

Ming He,

Xinjie Zhao,

Lu Ji

Publication year - 2017

Publication title -

progress in electromagnetics research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.245

H-Index - 33

ISSN - 1937-6480

DOI - 10.2528/pierl17062801

Subject(s) - band pass filter , dual (grammatical number) , multi band device , transmission (telecommunications) , filter (signal processing) , passband , electronic engineering , physics , topology (electrical circuits) , computer science , telecommunications , engineering , electrical engineering , antenna (radio) , art , literature

Two compact dual-band bandpass filters (BPFs) with closely spaced passbands are presented in this paper. Each of the filters consists of a stub loaded resonator, to which shorted lines are coupled. The ratio of the center frequencies of two passbands can be easily adjusted from 1.2 to 1.1 by changing the gap of the coupled line. In addition, seven transmission zeros (TZs) can be yielded to obtain high passband selectivity and enhance the out of band performances. As an example, two filters are designed, fabricated and measured. Both filters exhibit the merits of high passband selectivity, very low center frequency ratio, and wide stopband suppression.

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