A Double-Layer Metal-Only Huygens’ Metasurface Transmitarray

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Abstract
A dual-layer metal-only Huygens' unit is presented, which consists of double anti-symmetric multi-slot structures without relying on expensive dielectric substrates to achieve a complete 360° phase and high transmission amplitude (-2 dB). Also, the design strategy incorporates extra magnetic resonance, enriches the Huygens resonance, and allows more degrees of freedom to exploit the second-harmonic for center frequency multiplication. In order to verify the design scheme, an 18×18 transmitarray prototype is created by laser engraving, which consists of two thin metal sheets with a length of 360 mm. The measurement results show a maximum gain of 25 dB, an aperture efficiency of 51.9%, and a 3-dB bandwidth of 10.1%. As a proof of concept, another frequency multiplication design is verified through full-wave simulations to achieve a maximum gain of 26.2 dB at 11.9 GHz under the illumination of a standard pyramid horn with a center frequency of 5.8 GHz.
Funding Information
  • National Natural Science Foundation of China (U22B2095)
  • Chengdu-Chongqing Dual City Economic Circle Construction Technology Innovation Project (KJCXZD2020001)
  • Chongqing Technology Innovation and Application Development Project (cstc2019jscx-dxwtBX0001)

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