Abstract
This study proposes a three-layer focusing gradient metasurface for wavefront processing. The structure works in the frequency range of 15 to 25 GHz, and has a central frequency of 19.6 GHz. The metasurface unit is organized in a square and has high-impedance elements that reflect the full range of phase shifts. When the microwave beam is incident on this metasurface, the high-impedance elements modulate the beam according to the gradient arrangement, to realize the focusing effect of the lens, and the efficiency reaches 82%. The simulation results are consistent with the theoretical results.
Highlights
The acquisition of new materials with new optical properties has become an important research field [1]
Xu B (2020) Reflective Focusing Based on Few-Layer Gradient Metasurface Element Array
We propose and validate a new type of focusing lens based on a three-layer square gradient metasurface reflector array, which can approximate and the reflection phase in the range of 2π by controlling the metasurface unit
Summary
The acquisition of new materials with new optical properties has become an important research field [1]. Xu B (2020) Reflective Focusing Based on Few-Layer Gradient Metasurface Element Array. People acquire new materials by chemical synthesis [2], and they manipulate the optical properties by artificially designing dielectric constants and magnetic permeability [3, 4].
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