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Stopband-improved dual-mode bandpass filter using side-slit patch resonator

✍ Scribed by Rui Li; Lei Zhu

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

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✦ Synopsis

Abstract

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

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