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A triple‐mode bandpass filter using a modified circular patch resonator
Author(s) -
Serrano Ariana L. C.,
Correra Fatima Salete
Publication year - 2009
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.23950
Subject(s) - band pass filter , resonator , return loss , insertion loss , bandwidth (computing) , microwave , filter (signal processing) , helical resonator , materials science , acoustics , physics , electronic engineering , optics , engineering , optoelectronics , electrical engineering , telecommunications , antenna (radio)
This article presents a triple‐mode bandpass filter using a modified circular patch resonator. Etched slots in the resonator split the TM 1,1,0 Zdegenerate fundamental modes and also perturb the TM 2,1,0 Zmode, approximating their resonant frequencies to form a third‐order bandpass filter. A 2.42 GHz centered filter was designed and fabricated. Experimental results showed a fractional bandwidth of 29%, return loss better than 16 dB, insertion loss of 0.5 dB, and good second harmonic band rejection. The filter exhibited a size reduction of 51% compared with a filter using an unperturbed circular patch resonator at the same frequency. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 178–182, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23950