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Compact designs of a band-pass filter with novel open-loop resonators

✍ Scribed by Xin-Hua Jiang; Guo-Hui Li

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
208 KB
Volume
49
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

In this article, several square open‐loop resonators with transmission lines are proposed to design the optimized bandpass filters. A compact microstrip filter using an open‐loop resonator was designed, fabricated and measured. At the center frequency f~0~ = 1.80 GHz, a 3‐dB bandwidth of 5% can be varied from 1.76 to 1.85 GHz. The filter shows a maximum insertion loss in passband of 0.1 dB. A transmission zero is realized at about 3.1 GHz, and the attenuation at this frequency exceeds 70 dB. When compared with the conventional filters using coupled square open‐loop resonators, the proposed filter has a size reduction of 30%. Good agreement between measurements and simulations are obtained. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2755–2757, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22837

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