Linear-to-circular polarizer antenna
AssigneeUnited States of America has represented by the Secretary of the Air Force
InventorsBoris Tomasic, Carl R. Pfeiffer, Thomas P. Steffen
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Abstract
A linear-to-circular polarizer antenna is disclosed. In accordance with embodiments of the invention, the polarizer antenna includes an antenna operable to transmit and receive polarized signals and a linear-to-circular polarizer coupled to the antenna. The polarizer includes a plurality of cascaded elements, waveplates or anisotropic sheets, having biaxial permittivity. Each cascaded element has a principal axis rotated at different angles relative to an adjacent element about a z-axis of a 3-dimensional x, y, z coordinate system, and each element is composed of an artificial anisotropic dielectric. The polarizer further includes impedance matching layers disposed adjacent the cascaded elements.
Claims6
A polarizer antenna, comprising:
- an antenna operable to at least one of transmit and receive polarized signals;
- a linear-to-circular polarizer coupled to the antenna, the polarizer including:
- a plurality of cascaded anisotropic sheets having biaxial permittivity, each sheet having a principal axis rotated at different angles relative to an adjacent sheet about a z-axis of a 3-dimensional x, y, z coordinate system;
- and
- impedance matching layers disposed adjacent the cascaded sheets.
A polarizer antenna, comprising:
- an antenna operable to at least one of transmit and receive polarized signals;
- a linear-to-circular polarizer coupled to the antenna, the polarizer including:
- a plurality of cascaded anisotropic sheets having biaxial permittivity, each sheet having a principal axis rotated at different angles relative to an adjacent sheet about a z-axis of a 3-dimensional x, y, z coordinate system, the cascaded sheets comprising anisotropic metallic patterns having meanderline and metallic patch geometries;
- and
- impedance matching layers disposed adjacent the cascaded sheets, the impedance matching layers comprising a first assembly of impedance matching layers and a second assembly of impedance matching layers, each of the first and second assemblies of impedance matching layers comprising a first section having a first permittivity ϵ1, a second section having a second permittivity ϵ2 greater than the first permittivity, and a third section having a third permittivity ϵ3 greater than the second permittivity.
Dependencies are inferred from the claim text.