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<p>Radio Frequency (RF) energy harvester is a key emerging technology in wireless communication systems that captures power from ambient RF sources to power low-power sensors. The limitation of low efficiency and angular stability of the current RF energy harvesting device can be overcome by utilizing the metasurface. In this article, a highly efficient metasurface-based RF energy harvester (MSEH) with high angular stability is presented. The proposed device consists of an absorber and a rectification circuit. The metasurface absorber is designed to achieve a maximum absorption of 99.97% and an RF-to-AC conversion efficiency of 98.86% at 6&#xa0;GHz with very high angular stability up to 60°. The absorbed AC power is transferred to the rectification circuit through a metallic cylindrical via inserted between the top and bottom layers. The incorporation of a feeding network and rectification circuit inside the harvesting device reduces the rectifier size and enables a high AC-to-DC conversion efficiency of 61%. The prototype of the design is fabricated, and experimentally measured rectification efficiency is in good agreement with the simulated result.</p>

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A High-Efficiency Metasurface-Based RF Energy Harvester with High Angular Stability for Low Power Devices

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Piyush Ranjan,
  • Bambam Kumar,
  • Rajan Agrahari

摘要

Radio Frequency (RF) energy harvester is a key emerging technology in wireless communication systems that captures power from ambient RF sources to power low-power sensors. The limitation of low efficiency and angular stability of the current RF energy harvesting device can be overcome by utilizing the metasurface. In this article, a highly efficient metasurface-based RF energy harvester (MSEH) with high angular stability is presented. The proposed device consists of an absorber and a rectification circuit. The metasurface absorber is designed to achieve a maximum absorption of 99.97% and an RF-to-AC conversion efficiency of 98.86% at 6 GHz with very high angular stability up to 60°. The absorbed AC power is transferred to the rectification circuit through a metallic cylindrical via inserted between the top and bottom layers. The incorporation of a feeding network and rectification circuit inside the harvesting device reduces the rectifier size and enables a high AC-to-DC conversion efficiency of 61%. The prototype of the design is fabricated, and experimentally measured rectification efficiency is in good agreement with the simulated result.