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Novel quad‐band filter with high frequency ratio and controllable bandwidths using SLHSIRs and SLQSIRs
Author(s) -
Zhang Zhichong,
Chu QingXin,
Chen FuChang
Publication year - 2014
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.28717
Subject(s) - stub (electronics) , resonator , band pass filter , microwave , wavelength , electrical impedance , filter (signal processing) , electronic engineering , optics , materials science , acoustics , physics , engineering , optoelectronics , electrical engineering , telecommunications
This article presents a quad‐band bandpass filter (QB‐BPF) using a set of stub‐loaded half‐wavelength step impedance resonators operated at the second and third passbands (2.4/3.5 GHz) and a set of stub‐loaded quarter‐wavelength step impedance resonators operated at the first and fourth passbands (1.3/5.8 GHz), and the frequency ratio is 4.46 times. Furthermore, all the frequencies and bandwidths can be adjusted. Finally, the proposed filter is designed and fabricated. The measured results are in good agreement with the full‐wave simulation results. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2845–2848, 2014