✦ LIBER ✦

Compact microstrip low-pass filter using complementary split ring resonators with ultra-wide stopband and high selectivity

✍ Scribed by Hui-Yong Zeng; Guang-Ming Wang; Chen-Xin Zhang; Li Zhu

Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 196 KB
Volume: 52
Category: Article
ISSN: 0895-2477
DOI: 10.1002/mop.24942

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✦ Synopsis

Abstract

The transmission characteristic of the microstrip with complementary split ring resonator (CSRR) is researched. Compared with the conventional structure, this filter can achieve a wider bandgap by shifting the gap of CSRR from the side of the microstrip to the underside. And then, a lower transmission zero can be realized by loading a pair of narrow slots in the gap of the ring. The equivalent circuit model of the structure is provided. By cascading CSRR cells with different transmission zeros, a ultra‐wide bandgap low‐pass filter (LPF), which has a cutoff frequency at 4.3 GHz is designed. The designed LPF has a high performance with an insertion loss lower than 0.3 dB in pass band, a high out‐band suppression more than 20 dB (4.55–25 GHz), and a very sharp transition band about 0.25 GHz (4.3–4.55 GHz). © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 430–433, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24942

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