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A hairpin line wideband bandpass filter design with embedded open stubs
Author(s) -
Hung ChengYuan,
Weng MinHang,
Su YanKuin,
Yang RuYuan
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.22302
Subject(s) - stopband , passband , band pass filter , center frequency , wideband , bandwidth (computing) , microwave , elliptic filter , insertion loss , electronic engineering , band stop filter , engineering , electrical engineering , materials science , telecommunications , low pass filter
In this paper, a compact three‐poles hairpin line wideband bandpass filter with several embedded open stubs to improve the stopband is designed and implemented on print circuit board substrate. This filter at center frequency f 0 of 4.25 GHz has presented almost very good measured characteristics, including the bandwidth of 3.1–5.4 GHz (3‐dB fractional bandwidth of 54%), low insertion loss of −0.7 ± 0.4 dB, sharp rejection due to two transmission zeros in the passband edge created by interstage coupling, and wide stopband rejection greater than 15 dB from 5.6 to 11 GHz. Experimental results of the fabricated filter show a good agreement with the predict results. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 934–936, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22302