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Bandpass filter with wide stopband using broadside‐coupled microstrip T‐stub/DGS cell
Author(s) -
Luo Xun,
Ma JianGuo,
Li Erping
Publication year - 2011
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.26101
Subject(s) - stopband , stub (electronics) , microstrip , band pass filter , microwave , transition band , broadside , materials science , electronic engineering , optoelectronics , acoustics , filter (signal processing) , prototype filter , electrical engineering , engineering , physics , low pass filter , optics , telecommunications
A bandpass filter with wide stopband is proposed using the novel broadside‐coupled microstrip T‐stub/defected ground structure cells in this letter.The resonance of the proposed cell is finely adjusted. Besides, these cells with a proper coupled‐structure (i.e., interdigital coupled scheme) can achieve high selectivity only around the resonance, which leads to wide stopband operation. The measured filter operated at 2.2 GHz (i.e., center frequency f 0 ) exhibits a wide stopband up to 9.1 f 0 with a good rejection level greater than 30.5 dB. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26101