volume | PIER Journals

2011-04-14

Compact Dual-Band Bandpass Filter Using Improved Split Ring Resonators Based on Stepped Impedance Resonator

Liang Zhou,

Dr. Liang Zhou

Department of Electronic Engineering

Nanjing University of Aeronautics and Astronautics

China

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Shaobin Liu,

Dr. Shaobin Liu

Department of Electronic Engineering

Nanjing University of Aeronautics and Astronautics

China

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Hai Feng Zhang,

Prof. Hai Feng Zhang

College of Electronic and Information Engineering

Nanjing University of Aeronautics and Astronautics

China

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Xiang-Kun Kong,

Dr. Xiang-Kun Kong

College of Electronic and Information Engineering

Nanjing University of Aeronautics and Astronautics

China

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Ya-Nan Guo

Dr. Ya-Nan Guo

Department of Electronic Engineering

Nanjing University of Aeronautics and Astronautics

China

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Progress In Electromagnetics Research Letters, Vol. 23, 57-63, 2011

doi:10.2528/PIERL11030402

Abstract

In this letter, a compact planer dual-band bandpass filter(BPF) using novel split-ring resonators (SRRs) is proposed. Compared with conventional SRRs, the stepped impedance split ring resonator (SIR-SRR) has better performance on miniaturization. To verify good characteristics of the novel structure, a new resonator-embedded cross-coupled filter, constructed by a pair of new resonators, is designed. This new filter has good characteristics of compact size and high selectivity. The improved SRR unit cell has a size of 0.108λ_g×0.108λ_g (where λ_g is the guided wavelength) at central frequency (2.25 GHz) of upper passband. Simulated results show that two central frequencies of the filter locate at 1.90 and 2.25 GHz with 3-dB fractional bandwidths of 1.0% and 7.7%, respectively. The lower passband band is generated by inner resonator with a via hole to gound plane, while the upper passband is created by outer resonator. Moreover, a good out-band performance is shown in this letter. Its stop-bands are extended 0-1.85 GHz at lower band and 2.4-5.8 GHz at upper band with a rejection level of about 20-dB. The measured and simulated results are well complied with each other.

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Liang Zhou, Shaobin Liu, Hai Feng Zhang, Xiang-Kun Kong, and Ya-Nan Guo, "Compact Dual-Band Bandpass Filter Using Improved Split Ring Resonators Based on Stepped Impedance Resonator," Progress In Electromagnetics Research Letters, Vol. 23, 57-63, 2011.
doi:10.2528/PIERL11030402

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