Abstract
The reflection coefficient of a microwave surface wave incident at the termination of a metasurface is explored. Two different surface types are examined. One is a square array of square metallic patches on a dielectric-coated metallic ground plane, the other a Sievenpiper ‘mushroom’ array. In the latter the surface wave fields are more confined within the structure. Comparison of the measured surface-wave reflection spectra is made with that obtained from analytic theory and numerical modelling. The reflection coefficient is shown to be dependent on both the momentum mismatch between the surface wave and the freely propagating modes as well as the different field distributions of the two modes.
Highlights
The reflection coefficient of a microwave surface wave incident at the termination of a metasurface is explored
An impedance approximation was applied to the guiding interface in order to provide the necessary boundary condition for supporting a surface wave, whereas in the experiment itself a dielectric-coated metallic ground plane was used as the surface wave guiding interface[1]
There has been little published work in the open literature, and while the studies above utilise an impedance boundary condition, a full-field analysis of the propagation of surface waves on structured metasurfaces appears to be lacking. The purpose of this present study is to experimentally explore the reflection of microwave surface waves at the termination of two different metasurface structures, and to compare the results with those obtained by finite element method (FEM) modelling as well as analytic theory
Summary
The reflection coefficient of a microwave surface wave incident at the termination of a metasurface is explored. There has been little published work in the open literature, and while the studies above utilise an impedance boundary condition, a full-field analysis of the propagation of surface waves on structured metasurfaces appears to be lacking The purpose of this present study is to experimentally explore the reflection of microwave surface waves at the termination of two different metasurface structures, and to compare the results with those obtained by finite element method (FEM) modelling as well as analytic theory. One of the first studies of surface waves on metasurfaces was undertaken by Sievenpiper who, in his doctoral thesis, explored the dispersion of transverse-magnetic (TM)polarised surface waves supported by so called ‘mushroom’ or ‘thumbtack’ arrays, as well as a simpler structure without the via connecting the ground plane to the p atch[15,16] In this present study these types of metasurface are used to study the reflection of surface waves at a free space termination. This has been achieved by electrically connecting the ground plane of the metasurface to an L-shaped section of aluminium; the electrical connection was created by using a silver loaded epoxy, and terminating the aluminium with a microwave absorber (Eccosorb VHP-4)
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