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Novel wide‐stopband bandpass filter with good frequency selectivity based on composite right/left handed transmission line
Author(s) -
Pan Tao,
Song Kaijun,
Fan Yong
Publication year - 2012
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.27104
Subject(s) - stopband , band pass filter , passband , resonator , transmission line , coupling (piping) , electronic engineering , filter (signal processing) , elliptic filter , materials science , acoustics , physics , topology (electrical circuits) , engineering , band stop filter , optoelectronics , electrical engineering , low pass filter , metallurgy
A novel wide‐stopband bandpass filter (BPF) with quasi‐elliptic response based on composite right/left handed transmission line (CRLH‐TL) is presented in this letter. Two compact CRLH‐TL resonators are utilized in the proposed wide‐stopband BPF. A magnetic cross coupling between the input and output ports is also used, which can generate three additional transmission zeros near the passband. Then, the frequency selectivity of the bandpass filter is greatly improved. The equivalent circuit method is used to analyze the mechanism of the magnetic coupling. A wide‐stopband BPF operating at 2.42 GHz is designed, simulated, and fabricated to demonstrate the performance of the proposed filter structure. The measured results show good agreement with the simulated ones. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2494–2497, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27104