Linear-to-circular polarizer antenna

Patent metadata

Field	Value
Publication number	US-11283142-B2
Application number	US-201816202684-A
Country	US
Kind code	B2
Filing date	Nov 28, 2018
Priority date	Dec 5, 2017
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

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.

First claim

What is claimed is:

1. 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.

2. The linear-to-circular polarizer of claim 1 , where the cascaded sheets comprise anisotropic metallic patterns.

3. The linear-to-circular polarizer of claim 2 , where the anisotropic metallic patterns have meanderline and metallic patch geometries.

4. The linear-to-circular polarizer of claim 1 , where the impedance matching layers comprise 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 ϵ 1 , a second section having a second permittivity ϵ 2 greater than the first permittivity, and a third section having a third permittivity ϵ 3 greater than the second permittivity.

5. The linear-to-circular polarizer of claim 4 , where each assembly of impedance matching layers comprises a plurality of different substrates.

6. 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 ϵ 1 , a second section having a second permittivity ϵ 2 greater than the first permittivity, and a third section having a third permittivity ϵ 3 greater than the second permittivity.

Assignees

• Us Gov Air Force
• United States of America has represented by the Secretary of the Air Force

Inventors

• Tomasic Boris
• Pfeiffer Carl R
• Steffen Thomas P

Classifications

• H01P1/172 Primary

  using a dielectric element · CPC title

• H01Q15/246

  rotating the plane of polarisation of a linear polarised wave (guided wave H01P1/165) · CPC title

• H01Q5/335

  at the feed, e.g. for impedance matching · CPC title

• H01P1/173

  using a conductive element · CPC title

• H01Q21/064

  using horn or slot aerials (slotted waveguides arrays H01Q21/005) · CPC title