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Compact dual‐mode dual‐band bandpass filter using slotted stepped‐impedance resonator
Author(s) -
Song Lan,
Guan Xuehui,
Zhang Xiaoyan
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.28265
Subject(s) - resonator , band pass filter , passband , helical resonator , dual mode , multi band device , electrical impedance , microwave , bandwidth (computing) , acoustics , dielectric resonator antenna , filter (signal processing) , center frequency , materials science , electronic engineering , optoelectronics , physics , electrical engineering , engineering , telecommunications , antenna (radio)
A compact dual‐mode dual‐band bandpass filter (BPF) is proposed in this article. A T‐shaped slot is etched on the center of the low‐impedance part of a stepped‐impedance resonator, which mainly impact on the pairs of high‐order modes of the resonator. By tuning the length and width of the slot, both pairs of dual‐modes the resonator can be controlled, implying that the bandwidth of the filter can be controlled. The feed line is folded to fulfill the external coupling of the dual‐passband. A dual‐band BPF for 2.4 and 3.5 GHz application is designed, fabricated, and measured. Agreements between measured results and the simulated results verify the proposed structure. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1057–1060, 2014