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A compact low‐pass filter with ultrabroad stopband characteristics
Author(s) -
Lan SiangWen,
Weng MinHang,
Chang ShoouJinn,
Hung ChengYuan
Publication year - 2015
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.29446
Subject(s) - stopband , stub (electronics) , transition band , microwave , materials science , cutoff frequency , resonator , elliptic filter , passband , optoelectronics , low pass filter , electronic engineering , optics , acoustics , physics , band pass filter , filter (signal processing) , prototype filter , electrical engineering , engineering , telecommunications
A compact low‐pass filter (LPF) with ultrabroad stopband characteristic is presented in this article. This filter mainly consists of a rectangular stub resonator and cumulative open‐circuited stubs, providing multiple transmission zeros to form a wide stopband region. Further, two open stub loads are simply adopted to improve the band selectivity. This fabricated LPF exhibits a 3 dB cutoff frequency (f c ) at 1.74 GHz with an average low insertion loss of 0.25 dB and a broad stopband region from 2.6 to 22.8 GHz (10.8ƒ c ) under a high rejection level of 20 dB. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2800–2803, 2015