Premium
Dual‐band bandpass filter with tunable upper passband
Author(s) -
Feng LiYing,
Zheng HongXing,
Sun ChengGuang,
Cheng Dan
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.25866
Subject(s) - passband , band pass filter , resonator , butterworth filter , microwave , bandwidth (computing) , m derived filter , prototype filter , electronic filter topology , physics , filter (signal processing) , multi band device , electronic engineering , topology (electrical circuits) , band stop filter , optoelectronics , optics , engineering , telecommunications , electrical engineering , low pass filter , antenna (radio)
A microstrip dual‐band bandpass filter is developed in this article. Using a pair of square open‐loops coupled with a symmetric ladder‐shaped resonator, frequencies of this filter are operated at 1.57 and 2.45 GHz. The lower resonance frequency is decided by the length of the square resonators, and the higher one is done by the ladder‐shaped resonator. Therefore, both frequency and bandwidth of the upper passband can be controlled flexibly, whereas those of the lower band are fixed. Finally, a filter is fabricated based on the design topology. Measured results have shown very good performance of the filter. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:888–890, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25866