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A compact and low‐loss sub‐millimeter‐wave ultra‐wideband bandpass filter
Author(s) -
Cai Peng,
Ma Zhewang,
Guan Xuehui,
Zheng Guoxin,
Anada Tetsuo,
Hagiwara Gen
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.22149
Subject(s) - passband , elliptic filter , band pass filter , stopband , resonator , insertion loss , electronic engineering , butterworth filter , return loss , band stop filter , filter (signal processing) , physics , acoustics , microwave , high pass filter , optics , electrical engineering , engineering , telecommunications , low pass filter , antenna (radio)
This paper presents a new compact, low‐loss sub‐millimeter‐wave ultra‐wideband (UWB) bandpass filter (BPF) designed for vehicular radar systems. A dual‐mode ring resonator loaded with two 3λ 0 /4 open stubs is used in the filter to realize a passband width of about 30%. In order to widen the stopbands of the filter significantly, a multiple‐mode parallel‐coupled line structure is introduced at the output of the ring resonator. Due to the transmission zeros in the lower and upper stopbands of the filter produced by the dual‐mode ring resonator and the multiple‐mode parallel‐coupled line structure, the filter exhibits good performance including sharp attenuations near the passband, and an extremely wide stopband, together with low insertion and return losses in the passband. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 481–484, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22149