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Stopband‐improved dual‐mode bandpass filter using side‐slit patch resonator
Author(s) -
Li Rui,
Zhu Lei
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.22221
Subject(s) - stopband , resonator , passband , band pass filter , optics , split ring resonator , microwave , center frequency , bandwidth (computing) , band stop filter , physics , acoustics , filter (signal processing) , materials science , engineering , optoelectronics , electrical engineering , low pass filter , telecommunications
A rectangular patch resonator with four equal slits etched on sides is presented to make up a stopband‐improved dual‐mode filter. By stretching these four side slits towards the patch center, the first resonant frequency gets a gradual decrease while its second one keeps almost unchanged. This feature is attractive in widening upper stopband while miniaturizing overall size in filter design. To realize a relatively wide passband with DC‐blocking, the narrowed feed lines are deeply inserted into their respective slits, resulting in the enhanced capacitive coupling degree. Our studies imply that the spacing between the first two resonant frequencies of this resonator itself is increased by about 50% while the first spurious resonant frequency is fully rejected by introducing a pair of open‐circuited stubs in the feed lines. In final, a dual‐mode filter is optimally designed with a fractional bandwidth of 4.5% at 1.60 GHz and predicted results are confirmed by experiment. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 717–720, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22221