Theory, design, and experimental verification of a reflectionless bianisotropic Huygens' metasurface for wide-angle refraction.

By M. Chen, E. Abdo-Sánchez, A. Epstein, George V. Eleftheriades. 2018

148 citations recorded by the source corpus.

Huygens' metasurfaces are electrically thin devices which allow arbitrary field transformations. Beam refraction is among the first demonstrations of realized metasurfaces. As previously shown for extreme-angle refraction, control over only the electric impedance and magnetic admittance of the Huygens' metasurface proved insufficient to produce the desired reflectionless field transformation. To maintain zero reflections for wide refraction angles, magnetoelectric coupling between the electric and magnetic response of the metasurface, leading to bianisotropy, can be introduced. In this paper, we report the theory, design, and experimental characterization of a reflectionless bianisotropic metasurface for extreme-angle refraction of a normally incident plane wave towards 71.8$^\circ$ at 20 GHz. The theory and design of three-layer asymmetric bianisotropic unit cells are discussed. The realized printed circuit board structure was tested via full-wave simulations as well as experimental characterization. To experimentally verify the prototype, two setups were used. A quasi-optical experiment was conducted to assess the specular reflections of the metasurface, while a far-field antenna measurement characterized its refraction nature. The measurements verify that the fabricated metasurface has negligible reflections and the majority of the scattered power is refracted to the desired Floquet mode. This provides an experimental demonstration of a reflectionless wide-angle refracting metasurface using a bianisotropic Huygens' metasurface at microwave frequencies.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/0dae7ce9500da51a4ac2c8870e958aab3e49949e

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In Aerospace Engineering

In Electronic, Optical and Magnetic Materials

Citations in the corpus

Roadmap on metasurfaces (2019, methodology): “The metasurface lens placed in close proximity to the waveguide leaves the H-plane unchanged but collimates the E-plane considerably leading to an average gain enhancement of 10 dB around 35 GHz (see figure 5(b)) [39].”
Broadband Double-Layered Huygens’ Metasurface Lens Antenna for 5G Millimeter-Wave Systems (2020, background): “Therefore, Huygens’ metasurface can control the transmitted wavefront with high efficiency such as beam splitting [43], wide-angle refraction [44], broadband wave manipulation [42], [45], [46], and parametric wave control [47].”