Abstract
We propose a new technique for wavefront manipulation using a high-impedance metasurface made of a reflectarray containing gradient mushroom-shaped elements, which provide a full-range phase shift for accomplishing the manipulation. The reflection phase of the high-impedance metasurface shows a linear discontinuity dependence on the sizes of the unit elements. Near-diffraction-limited focusing and a high efficiency of 80% were achieved by modulating the reflection phase using the gradient high-impedance metasurface. The experimental results and the theoretical simulation were in good agreement. The proposed gradient high-impedance metasurface can be employed for highly effective wavefront engineering.
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