In recent years, active metasurfaces have induced more interests, which provides great freedom of wave manipulation and gives rise to many novel phenomena. High impedance metasurfaces are a kind of artificial structures characterized by the in-phase reflection at the resonant frequency. It works as a magnetic mirror and can be applied in subwavelength cavity, low profile reflector antenna, etc. When introduce in tunable components, it possesses versatile functionalities and broader application. In this paper, we proposed an active high impedance metasurface which exhibits highly efficient absorption to the electromagnetic incidence. As an array of diodes are loaded between the gap of periodic gratings and applied with positive bias, the absorption frequency can be dynamically controlled by the level of bias voltage. At the resonant frequency, the reflection from the metasurface can be less than 1%, implying that most of the incidence is absorbed by the magnetic resonance of high impedance metasurface. When the bias voltage is tuned from 0 to +1.33 V (the forward voltage), the resonant peak rises from 8.5 to 9.1 GHz, providing a flexible control of electromagnetic wave absorption in X band.

近年来，活跃的超表面引起了越来越多的兴趣，这提供了极大的波动操纵自由度并产生了许多新颖的现象。高阻抗超表面是一种人造结构，其特征在于谐振频率下的同相反射。它用作磁镜，可应用于亚波长腔，低剖面反射器天线等。当引入可调组件时，它具有通用的功能并具有广泛的应用。在本文中，我们提出了一个主动的高阻抗超表面，对电磁入射具有高效吸收。当二极管阵列装在周期性光栅的间隙之间并施加正偏压时，吸收频率可以由偏压电平动态控制。在共振频率下 来自超表面的反射可以小于1％，这意味着大部分入射被高阻抗超表面的磁共振吸收。当偏置电压从0调整到+1.33 V（正向电压）时，谐振峰值从8.5 GHz上升到9.1 GHz，从而可以灵活控制X波段的电磁波吸收。