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A high selectivity and wide stopband UWB bandpass filter using asymmetric SIRs with split‐end
Author(s) -
Weng MinHang,
Chen WeiYu,
Lan SiangWen,
Chang ShoouJinn,
Su YiHsin
Publication year - 2014
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.28321
Subject(s) - stopband , passband , band pass filter , elliptic filter , resonator , spurious relationship , microwave , selectivity , electrical impedance , electronic engineering , filter (signal processing) , materials science , physics , prototype filter , optoelectronics , engineering , computer science , low pass filter , electrical engineering , telecommunications , chemistry , biochemistry , machine learning , catalysis
In this article, a design of high selectivity and wide stopband ultrawideband (UWB) filter based on the asymmetric step‐impedance resonator (SIR) with split‐end is proposed. By properly selecting the impedance ratio, R, and the length ratio, α, and arranging the length of split‐ends of the asymmetric SIR, the good UWB passband using only one asymmetric SIR is realized from 2.9 to 5.1 GHz. Moreover, by tuning the feedlines as I/O ports with the split‐ends of the asymmetric SIR, three transmission zeros are well investigated and introduced for improving the selectivity of passband and providing the spurious suppression. Measured results of the fabricated filter have a good agreement with the full‐wave simulated results. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1353–1356, 2014