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A miniaturized narrowband bandpass filter with wide stopband using open‐loop resonator
Author(s) -
Feng LiYing,
Zheng HongXing
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.26206
Subject(s) - narrowband , band pass filter , stopband , electronic engineering , resonator , bandwidth (computing) , spurious relationship , electronic filter topology , microwave , prototype filter , passband , filter (signal processing) , engineering , topology (electrical circuits) , computer science , electrical engineering , low pass filter , telecommunications , machine learning
To obtain a very good performance of filter in wireless system, a miniaturized microstrip narrowband bandpass filter (BPF) is investigated based on an open‐loop resonator analysis. The newly designed BPF has been given with two advantages: one is of a compact size and the other is of a large ratio of the first spurious resonant frequency to the fundamental frequency. Then empirical designing equations of this structure have been discussed. The 3‐dB fractional bandwidth and selectivity of the filter can be selected flexibly by using those equations. Finally, a fabricated filter is applied to validating the proposed method. Experimental results are in very good agreement with simulations. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26206