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Title: Equivalent-Circuit Model with Retarded Electromagnetic Coupling for Meta-Atoms of Wired Metallic Spheres
Authors: OHISHI, Katsuya
HISAKADO, Takashi  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-5078-2296 (unconfirmed)
MATSUSHIMA, Tohlu
WADA, Osami  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-8869-4785 (unconfirmed)
Author's alias: 久門, 尚史
和田, 修己
Keywords: metamaterial
meta-atom
equivalent-circuit model
retardation
radiation
electromagnetic coupling
Issue Date: Dec-2018
Publisher: Institute of Electronics, Information and Communications Engineers (IEICE)
Journal title: IEICE Transactions on Electronics
Volume: E101.C
Issue: 12
Start page: 923
End page: 930
Abstract: This paper describes the equivalent-circuit model of a metamaterial composed of conducting spheres and wires. This model involves electromagnetic coupling between the conductors, with retardation. The lumped-parameter equivalent circuit, which imports retardation to the electromagnetic coupling, is developed in this paper from Maxwell's equation. Using the equivalent-circuit model, we clarify the relationship between the retardation and radiation loss; we theoretically demonstrate that the electromagnetic retardation in the near-field represents the radiation loss of the meta-atom in the far-field. Furthermore, this paper focuses on the retarded electromagnetic coupling between two meta-atoms; we estimate the changes in the resonant frequencies and the losses due to the distance between the two coupled meta-atoms. It is established that the dependence characteristics are significantly affected by electromagnetic retardation.
Rights: © 2018 The Institute of Electronics, Information and Communication Engineers
URI: http://hdl.handle.net/2433/252318
DOI(Published Version): 10.1587/transele.E101.C.923
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