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Definition of artificially soft and hard surfaces for electromagnetic waves

Definition of artificially soft and hard surfaces for electromagnetic waves

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The widely used transversely corrugated surfaces and other alternative surfaces having the same anisotropic surface impedance deserve a common name. Here it is proposed to call them soft surfaces by analogy with the soft surfaces in acoustics. In the same way artificially hard surfaces are defined. Cylindrical hard waveguides of any cross-sectional shape can support TEM waves.

References

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