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Microwave dual‐band bandstop filter with improved spurious resonance behavior
Author(s) -
Vegesna Subash,
Saed Mohammad
Publication year - 2013
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20697
Subject(s) - stopband , band stop filter , passband , spurious relationship , microwave , resonator , multi band device , resonance (particle physics) , bandwidth (computing) , prototype filter , frequency response , band pass filter , electronic engineering , physics , acoustics , materials science , optoelectronics , low pass filter , computer science , optics , electrical engineering , telecommunications , engineering , atomic physics , machine learning , antenna (radio)
A design technique to improve the spurious resonance behavior of dual‐band bandstop filters is presented. A compact dual‐band bandstop filter with two stop bands that can be controlled independently with improved passband frequency response is designed. The operational bandwidth of the proposed compact dual‐band bandstop filter is increased by pushing the first spurious resonance from being about twice the resonance frequency to more than three times the resonance frequency. Stepped impedance open loop resonators with substantially increased outer‐edge width are used to improve the spurious resonance response. Both simulation and measured results are presented and good agreement is obtained between the results. The fabricated filter exhibits dual operating frequencies at 1460 MHz and 2640 MHz with 5.5% and 5% stopband fractional bandwidths, respectively. © 2012 Wiley Periodicals, Inc. Int J RF and Microwave CAE 23: 627–633, 2013.