Current-Control Methods in Graphene Transmission Lines for Tunable Antennas on Printed Circuit Boards

石墨烯是一种单原子厚度的二维（2D）材料，由碳制成。它于2004年首次被分离出来，从那时起，许多其他二维材料已经在实验室中成功分离出来，但石墨烯仍然是研究最广泛的。该材料具有优异的机械、电学、热学和光学性能。所有这些特性都是在单一材料中发现的，以及通过化学功能化影响这些特性的可能性，激发了人们对石墨烯的极大兴趣。石墨烯薄膜可以用定制设计的电导率来制造，这些电导率可以低于、等于或高于金属。然而，与半导体一样，石墨烯薄膜的导电性可以随着电流路径上的外部施加电压而改变。由于石墨烯表现出一些类似于金属的电子特性，而另一些则更类似于半导体，因此这种材料为发现新的电子元件提供了独特的机会。在这个项目中，皇后大学和Grafoid公司（Kingston,Ontario）将使用石墨烯研究用于超低功耗无线链路的可调谐高频天线的先进概念。

Graphene is a one-atom thick two-dimensional (2D) material material made of carbon. It was first isolated in 2004 and, since thattime, many other 2D materials have been successfully isolated in the laboratory but graphene continues to be the most widelystudied. The material has exceptional properties such as excellent mechanical, electrical, thermal, and optical properties. The factthat all these properties are found within a single material, along with the possibility to influence these properties through chemicalfunctionalization has stimulated great interest in graphene. Graphene films can be fabricated with custom-designed conductivitiesthat are lower, equal to, or higher than that of a metal. Yet, as with semiconductors, a graphene films conductivity can bechanged with an externally applied voltage along the path of the current flow. Because graphene exhibits some electronicproperties that are similar to metals while others that are more similar to semiconductors, this material presents uniqueopportunities for the discovery of new electronic components. In this project, Queens University and Grafoid Inc. (Kingston,Ontario) will use graphene to investigate advanced concepts for tunable high-frequency antennas for ultra low-power wirelesslinks.