Tensorial Impedance Surfaces for Manipulating Microwaves

Metasurfaces average boundary conditions are often described with a "surface impedance". Tensorial impedance metasurfaces are surfaces where, due to anisotropy, the impedance becomes a 2nd rank tensor. This results in a boundary condition that has greater control over the surface fields than scalar impedance boundaries. Most prominently, this greater control allows for polarisation conversion. Homogeneous tensorial impedance surfaces under plane wave illumination are initially discussed, with the reflection coefficients for a generic tensorial impedance boundary derived. This work includes the derivation of an equation that calculates the range of impedance spatial distributions that satisfy a desired reflection problem. The degree of freedom in the impedance is explored under the conditions of the impedance matrix being reciprocal, passive and orthonormal. Verification is done with reflection problems that demand non-specular reflection and polarisation conversion. A metasurface design is proposed that exhibits an effective impedance that is non-orthogonal to demonstrate that the condition is not strictly required. In the final content chapter, a method is shown for imitating the impedance distributions calculated with our new method. These designs exhibit simultaneous anomalous reflection and polarisation conversion, with in some cases demonstrating control over multiple reflected waves.<p></p>

Author dc:creator

• Jonathon Smith (21058820)

• Metamaterials
• Metasurfaces
• Microwaves
• Impedance
• Electromagnetics
• Holography
• AMC
• antenna

Statement dc:rights

• All rights reserved

Identifier

10779/exe.32334456.v1

OAI identifier oai:identifier

oai:figshare.com:article/32334456