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A compact dual‐band bandstop filter using a circular, folded, symmetric, meandered‐line, stepped‐impedance resonator
Author(s) -
Dhakal Rajendra,
Kim NamYoung
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.28579
Subject(s) - resonator , microwave , attenuation , electrical impedance , transmission line , band stop filter , physics , bandwidth (computing) , multi band device , passband , filter (signal processing) , insertion loss , optics , electrical engineering , band pass filter , telecommunications , engineering , low pass filter , antenna (radio)
This letter describes the implementation of a dual‐band bandstop filter based on a circular, folded, symmetric‐type, two‐section, meandered‐line, stepped‐impedance resonator (SIR), resonating at f 1 = 3.17 GHz and f 2 = 8.50 GHz. The length of each section of meandered‐line is equal to 0.30 and is 0.60 times the guided wavelength (λ g ), which can be properly tuned to control the first and second resonant frequencies. The attenuation level of the signal at 5.83 GHz can be increased by the proper placement of transmission zero, which ultimately helps to generate a controllable ultrawide stop band bandwidth. This filter reached an attenuation level of 32.75 and 26.21 dB with insertion losses of 0.43 and 0.39 dB at the respective stop bands. The size of the filter was drastically reduced using a simplified architecture as a circular, folded, meandered‐line, SIR. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2298–2301, 2014