Nonlinear Power-Dependent Impedance Surface
Nonlinear Power-Dependent Impedance Surface
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DOI：
10.1109/tap.2015.2399513
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发表时间：
2015-04-01
影响因子：
5.7
通讯作者：
Sievenpiper, Daniel
中科院分区：
文献类型：
--
作者：
Luo, Zhangjie;Chen, Xing;Sievenpiper, Daniel
阻抗表面是人工设计的支持表面波的周期性结构。本文提出了一种新的非线性阻抗面的概念，它的阻抗随表面波功率的增加而增加。建议的表面由一个网格的修改开槽蘑菇状细胞加载变容二极管和集总电路。该电路被设计成感测入射表面波功率并反馈信号以控制变容二极管的偏置，从而最终调谐表面阻抗。这种提出的功率依赖阻抗表面已经通过由4 × 10个单元组成的原型来证明。从实验中观察到，当功率从16到27 dBm变化时，表面呈现出j385到j710 Ω的表面阻抗范围。这一特性使得该表面在自陷表面波波导、功率依赖波束控制天线反射器和其他非线性应用中具有潜在的用途。
Impedance surfaces are artificially designed periodic structures that support surface waves. This paper presents a novel concept of a nonlinear impedance surface, whose impedance increases with the surface wave power. The proposed surface consists of a lattice of modified slotted mushroom-like cells loaded with varactor diodes and lumped circuits. The circuits are designed to sense the incoming surface wave power and feed back the signal to control the bias of the varactors, which eventually tunes the surface impedance. Such proposed power-dependent impedance surface has been demonstrated by a prototype consisting of 4 x 10 cells. It is observed from the experiments that as the power varies from 16 to 27 dBm, the surface exhibits a surface impedance range as much as j385 to j710 Omega. This characteristic enables the surface to be potentially useful in self-trapping surface-wave waveguide, power-dependent beam-steering antenna reflector, and other nonlinear applications.