Linear-to-circular polarizers using cascaded sheet impedances and cascaded waveplates
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United States of America Patent
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Sep 22, 2020
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Jun 6, 2019
app pub date -
Nov 13, 2018
filing date -
Dec 5, 2017
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Abstract
An ultra-wideband linear-to-circular polarizer is disclosed. In accordance with embodiments of the invention, the polarizer includes a plurality of cascaded waveplates having biaxial permittivity or cascaded anisotropic sheet impedances. Each waveplate/sheet has a principal axis rotated at different angles relative to an adjacent waveplate/sheet about a z-axis of a 3-dimensional x, y, z coordinate system. Each waveplate is composed of a unit cell of an artificial anisotropic dielectric. Each sheet impedance is composed of an anisotropic metallic pattern. The polarizer further includes impedance matching layers disposed adjacent the cascaded waveplates/sheets.
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