Journal
JOURNAL OF CENTRAL SOUTH UNIVERSITY
Volume 27, Issue 4, Pages 1235-1246Publisher
JOURNAL OF CENTRAL SOUTH UNIV
DOI: 10.1007/s11771-020-4363-5
Keywords
metamaterial; square-split-ring; negative permittivity; induced magnetic dipole
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Funding
- National Key Research and Development Program of China [2017YFA0204600]
- National Natural Science Foundation of China [51802352]
- Natural Science Foundation of Hunan Province of China [2019JJ50768]
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Left-hand materials have drawn increasing attention from many disciplines and found widespread application, especially in microwave engineering. A sandwiched metamaterial consisting of multi-nested square-split-ring resonators on the top side and a set of wires on the back side is proposed. Scattering parameters are retrieved by high-frequency structure simulator (HFSS) software based on the finite element method. Effects of square-split-ring number on the left-hand characteristics containing negative values of permittivity, permeability, and refractive index have been intensively investigated. Simulated results show that obvious resonant left-hand characteristics could be observed within 8-18 GHz, and the resonant frequency counts are inclined to be in direct proportion to the square-split-ring number over 8-18 GHz. Besides, the proposed sandwiched metamaterial with three square-split-ring resonators and three wires presents the widest frequency band of left-hand characteristics in a range of 8-18 GHz. Further, electromagnetic field distributions demonstrated that the induced magnetic dipole dominates the resonant absorption. The multi-peak resonance characteristics of square-split-ring resonant structure are considered to be a promising candidate for selective-frequency absorption or modulation toward microwave frequency band.
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