二氧化钒的相变调控特性及可重构超表面天线应用研究

Research on Metal-insulating Transition of Vanadium Dioxide and Its Applications on Reconfigurable Metasurface Antenna

对二氧化钒(VO_(2))薄膜的相变调控特性及方法进行了理论分析和实验探索。采用电激励方式研究了不同电极对相变程度的影响,发现电极尺寸和形状与绝缘状态下电阻的变化密切相关,从而影响相变程度。此外,相变程度也受不同调控方式的影响,可以用焦耳热原理解释。进一步将VO_(2)薄膜与超表面结构相结合,设计实现了大范围频率可重构的超表面天线。相比传统开关,VO_(2)薄膜在毫米波频段具有隔离度高、损耗低的优势,可为进一步研制高性能可调器件和天线提供重要的技术指导。

The metal-insulating transition(MIT)of vanadium dioxide(VO_(2))film is theoretically and experimentally investigated.The influence of the electrodes on the degree of the MIT is studied firstly with the electrical excitation.It is found that the size and shape of the electrodes are closely related to the resistance in the insulating state,thereby affecting the MIT degree.Moreover,the MIT degree is also affected by different control approaches,which can be explained by the Joule heat mechanism.Finally,the VO_(2) film is combined with the metasurface structure to achieve a wide range of frequency reconfigurable antenna.Compared with traditional switches,VO_(2) film has the advantages of high isolation and low loss in the millimeter-wave band,which can provide important guidance for the development of high-performance tunable devices and antennas.