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A compact wideband bandpass filter using modified NB‐SRRs with wide upper bandstop
Author(s) -
Chaimool Sarawuth,
Akkaraekthalin Prayoot
Publication year - 2010
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.24968
Subject(s) - stopband , wideband , resonator , band stop filter , band pass filter , passband , split ring resonator , microwave , spurious relationship , acoustics , attenuation , materials science , physics , filter (signal processing) , electronic engineering , optics , engineering , optoelectronics , low pass filter , electrical engineering , computer science , telecommunications , machine learning
A new type of compact wideband bandpass filter using modified non‐bianisotropic split‐ring resonators is proposed to have wideband performance and suppress spurious responses. With the proposed resonators, size reduction of ∼15% and 20% when comparing single outer and inner constituent rings has been obtained. Embedded‐slot‐loaded resonators are placed at both input and output feed lines for extra stopband rejection modes to suppress spurious frequencies with attenuation losses over than 15 dB for a frequency range up to 3.1 f 0 without affecting the operation band. In addition, due to the zero‐degree feed structure, the appearance of two transmission zeros, thereby suppressing the second harmonic response has been obtained. This filter has not been only compact size but also a wider upper stopband caused by slot‐loaded resonator bandstop characteristics. Good agreement is obtained between simulations and measurements. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 551–553, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24968