Self-Dual Wideband Absorbers

Self-dual balanced structures, comprising finite electric and magnetic regions, are invariant to 90 degrees rotation if electric and magnetic regions are interchanged with the rotation. Such structures will produce no backscattering when subject to plane wave illumination along the axis of rotation...

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Bibliographic Details
Published in2018 International Conference on Electromagnetics in Advanced Applications (ICEAA) pp. 433 - 434
Main Authors Estakhri, Nasim Mohammadi, Engheta, Nader, Kastner, Raphael
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2018
Subjects
Absorbers
Absorption
Backscatter
balanced media
Conductors
Media
Periodic structures
self-dual structures
Surface waves
Wideband
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DOI10.1109/ICEAA.2018.8520470

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Summary:Self-dual balanced structures, comprising finite electric and magnetic regions, are invariant to 90 degrees rotation if electric and magnetic regions are interchanged with the rotation. Such structures will produce no backscattering when subject to plane wave illumination along the axis of rotation provided that the Weston balanced condition ∊ r = μ r is obeyed. When higher order spatial harmonics are suppressed, e.g. in a periodic structure whose unit cell is smaller than the wavelength, the entire incident power is forced to be transmitted through the structure. With proper design, this phenomenon can be exploited to produce absorbers over a wide range of frequencies, provided that the constitutive parameters adhere to the Weston condition throughout this range.
DOI:10.1109/ICEAA.2018.8520470