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A novel ultra wideband bandpass filter using microstrip double-ring resonators

✍ Scribed by Wei Liu; Zhewang Ma; Chun-Ping Chen; Guoxin Zheng; Tetsuo Anada

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
173 KB
Volume
49
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

An ultra wideband bandpass filter with sharp‐rejection is proposed by using a new structure of double ring resonators. The double ring resonator generates a couple of attenuation poles, and its operation mechanism is made clear through the even‐ and odd‐mode analysis of the circuit. The stopband of the filter can be significantly widened by cascading the double ring resonators. A two‐stage microstrip bandpass filter with a 3‐dB fractional bandwidth of 80% is designed, fabricated, and tested. The measured frequency response of the filter validates well the theoretical analysis and electromagnetic simulation. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 303–305, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22117

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