文章基本信息

标题：Stopband-Extended and Size-Miniaturized Low-Pass Filter with Three Transmission Zeros
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作者：Li, Lin ; Bao, Jia ; Du, Jing-Jing 等
期刊名称：ETRI Journal
印刷版ISSN：1225-6463
电子版ISSN：2233-7326
出版年度：2014
卷号：36
期号：2
页码：286-292
DOI：10.4218/etrij.14.0113.0430
语种：English
出版社：Electronics and Telecommunications Research Institute
摘要：This paper presents a compact structure composed of an upper high-impedance transmission line, a middle extended parallel coupled line, and a pair of inter-coupled symmetrical stepped impedance stubs. Detailed investigation into this structure based on an equivalent circuit analysis reveals that this proposed structure exhibits a quasi-elliptic low-pass filtering response with three transmission zeros. Moreover, the positions of the three transmission zeros can be tuned and reallocated flexibly by choosing the proper circuit parameters. Finally, the design concept is validated through the design, fabrication, and measurement of two exemplary low-pass filters (LPFs) with one single unit and two cascaded asymmetric units. The measured results agree well with the simulated results. In addition, in the range of to , the fabricated quasi-elliptic LPFs experimentally demonstrate a very wide upper-stopband of 20 dB using a compact size of only , where is the guided wavelength of a transmission line at the central frequency.
关键词：Low-pass filter (LPF);transmission zero;wide stopband;compact size