Complementary Metasurfaces for Guiding Electromagnetic Wave

Metasurfaces can be employed for designing waveguides that confine the electromagnetic energy while they are open structures. In this communication, we introduce a new type of such waveguides, formed by two penetrable metasurfaces having complementary isotropic surface impedances. We theoretically s...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2021-03, Vol.69 (3), p.1815-1820
Main Authors: Ma, X., Mirmoosa, M. S., Tretyakov, S. A.
Format: Article
Language:English
Subjects:
Complementary metasurfaces
Dispersion
dispersion curve
Electromagnetic radiation
Extreme values
Frequency ranges
Impedance
Leaky waves
Metasurfaces
open waveguides
Phase velocity
Planar waveguides
Resonant frequency
Surface impedance
Surface waves
Waveguides
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Summary:Metasurfaces can be employed for designing waveguides that confine the electromagnetic energy while they are open structures. In this communication, we introduce a new type of such waveguides, formed by two penetrable metasurfaces having complementary isotropic surface impedances. We theoretically study the guided modes supported by the proposed structure and discuss the corresponding dispersion properties. We show the results for different scenarios in which the surface impedances possess nonresonant or resonant characteristics, and the distance between the two metasurfaces changes from large values to the extreme limit of zero. We also derive and describe the general condition for existence of two modes with orthogonal polarizations having the same phase velocity. In the particular case in which the metasurfaces are complementary and the distance between them is not small, we indicate that such phenomenon occurs within a broad frequency range. This property can be promising for applications in leaky-wave antennas and field focusing.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2020.3018536