基于Wi-Fi频段的宽带电磁能量收集超表面

Wideband Electromagnetic Energy Harvesting Metasurface Based on Wi-Fi Frequency Band

摘要:

提出了一种用于 Wi-Fi频段电磁能量收集的宽带电磁整流超表面。超表面单元尺寸为 34 mm×34 mm× 5 mm。所选用的肖特基二极管不仅能将射频电磁能量整流成直流能量，而且利用其在高频电路下的非线性、高阻抗特性可实现空间波阻抗与超表面之间的直接阻抗匹配，省略了复杂的匹配电路，增加了其工作带宽。之后再通过背面的滤波电路将直流电磁能量输出到负载实现能量收集的功能。中心对称的结构保证其可收集空间中任意极化方向入射的电磁波，表现出极化角度不敏感的特性，使其可适应更复杂的环境，拓宽了应用场景。

Abstract:

A wideband electromagnetic rectification metasurface for collecting electromagnetic energy in the WiFi frequency band is proposed in this paper. The size of the metasurface unit is 34 mm × 34 mm × 5 mm. The selected Schottky diode not only rectifies RF electromagnetic energy into DC energy but also utilizes its nonlinear and high-impedance characteristics in high-frequency circuits to achieve direct impedance matching between the spatial wave impedance and the metasurface， thereby increasing its operating bandwidth. Subsequently， the DC electromagnetic energy is delivered to the load through the filtering circuit on the back， enabling energy collection. The centrally symmetrical structure ensures that it can collect electromagnetic waves incident from any polarization direction in space， and its polarization insensitivity broadens its range of application.