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Frontiers of Optoelectronics

Front. Optoelectron.    2016, Vol. 9 Issue (4) : 565-570     DOI: 10.1007/s12200-016-0501-y
RESEARCH ARTICLE |
Broadband coplane metamaterial filter based on two nested split-ring-resonators
Benxin WANG1,Xiang ZHAI1(),Guizhen WANG2,Weiqing HUANG1,Lingling WANG1
1. School of Physics and Electronics, Hunan University, Changsha 410082, China
2. Modern Educational Technology Center, Hunan Traditional Chinese Medical College, Zhuzhou 412012, China
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Abstract

Split ring resonators (SRRs)-based broadband metamaterial filters have attracted considerable attention due to their great prospect of practical applications. These filters had been usually obtained by stacking multiple different-sized metallic patterns, making their fabrication quite troublesome. Herein, we presented a simple design of broadband filter composed of two nested SRRs. The resonance bandwidth of the metamaterial filter gradually increased with the decrease of the arm length of the inner SRR. The increase in the resonance bandwidth was attributed to the increase in the radiation of the entire structure. Moreover, the bandwidth of the metamaterial can be further broadened by decreasing the period of the structure. The proposed filter provides a meaningful way toward expanding the bandwidth operating range from narrowband to broadband in an effective way.

Keywords metamaterial      broadband filter      split-ring-resonators     
Corresponding Authors: Xiang ZHAI   
Just Accepted Date: 25 December 2015   Online First Date: 14 January 2016    Issue Date: 29 November 2016
 Cite this article:   
Benxin WANG,Xiang ZHAI,Guizhen WANG, et al. Broadband coplane metamaterial filter based on two nested split-ring-resonators[J]. Front. Optoelectron., 2016, 9(4): 565-570.
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http://journal.hep.com.cn/foe/EN/10.1007/s12200-016-0501-y
http://journal.hep.com.cn/foe/EN/Y2016/V9/I4/565
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Benxin WANG
Xiang ZHAI
Guizhen WANG
Weiqing HUANG
Lingling WANG
Fig.1  (a) is the schematic of designed structural, black dotted line in (a) represents a unit cell (b)
Fig.2  Normalized transmission spectra of original SRR and the proposed structure with different values of s2, respectively
Fig.3  Calculated electric (|E|) (up panel) and magnetic (|Hz|) (low panel) field distributions corresponding to different transmission dips at s2 = 4, 8, and 12 mm, respectively
Fig.4  Calculated electric (|E|) and magnetic (|Hz|) field distributions corresponding to different transmission dips at s2 = 20, 24, and 28 mm, respectively
Fig.5  Dependence of the spectral resonance of the nested structure with the change of s1 for s2 = 4 mm (a) and 28 mm (b), respectively; (c) influence of the size of period P on resonance bandwidth
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