An effective-medium model for high-impedance surfaces |
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Authors: | JM Hao L Zhou CT Chan |
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Institution: | (1) Surface Physics Laboratory (State Key Laboratory) and Physics Department, Fudan University, Shanghai, 200433, P.R. China;(2) Physics Department, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P.R. China |
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Abstract: | We show that high-impedance surfaces with complex microstructures can be well described by a double-layer effective-medium
model consisting of an anisotropic meta-material layer (with a dispersive permeability μ) put on top of a metal sheet. We
predict that a complete surface wave (SW) gap exists in such a system when the condition 0<μ<1 is fulfilled, and we verify
this prediction by finite-difference-time-domain (FDTD) simulations on realistic structures. We argue that opening a SW gap
in the in-phase reflection regime requires an additional mechanism for such kinds of systems, and demonstrate this argument
via FDTD simulations on two commonly adopted structures.
PACS 41.20.Jb; 78.20.Bh |
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Keywords: | |
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