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A novel ultra wideband bandpass filter using microstrip double‐ring resonators
Author(s) -
Liu Wei,
Ma Zhewang,
Chen ChunPing,
Zheng Guoxin,
Anada Tetsuo
Publication year - 2007
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.22117
Subject(s) - band pass filter , stopband , resonator , wideband , microstrip , electronic engineering , microwave , electronic filter topology , bandwidth (computing) , band stop filter , split ring resonator , filter (signal processing) , prototype filter , engineering , physics , low pass filter , electrical engineering , telecommunications
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