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UWB bandpass filter with wide stopband using open stubs
Author(s) -
Yang RuYuan,
Hung ChengYuan,
Su YanKuin,
Weng MinHang
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.22212
Subject(s) - stopband , passband , elliptic filter , center frequency , band pass filter , bandwidth (computing) , microwave , materials science , transition band , fractional bandwidth , electronic engineering , band stop filter , wideband , prototype filter , optoelectronics , acoustics , engineering , physics , telecommunications , low pass filter
In this paper, a compact pseudo‐interdigital ultra‐wideband filter using several open stubs to improve the stopband is designed and implemented on FR4 substrate. This filter at center frequency f 0 of 4 GHz has presented almost very good measured characteristics, including the bandwidth of 3–5.1 GHz (3‐dB fractional bandwidth of 52%), low insertion loss of −0.6 ± 0.4 dB, sharp rejection due to two transmission zeros in the passband edge created by inter‐stage coupling, and wide stopband rejection greater than 15 dB from 5.3–9 GHz. Experimental results of the fabricated filter show a good agreement with the predict results. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 573–575, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22212