基于石墨烯的波束可重构太赫兹天线

设计了一种工作在太赫兹(THz)频率下的微带八木(QYU)天线.该天线由金属微带传输线、金属反射器、金属半圆形辐射贴片和三组单分子层-石墨烯-贴片导向器组成.由于石墨烯的电导率可电调谐特性,可以通过调整施加在石墨烯导向器上的偏置电压来动态调控天线的辐射方向.通过对天线的基本性能和可调特性系统地模拟和优化,数值结果表明,通过改变加在石墨烯导向器的偏压,天线的主辐射波瓣角φ(方位角)可以在30°-150°的范围内进行扫描,并且具有非常快的调制速度和非常低的回波损耗.该天线非常适合于相控阵雷达等THz波束可重构应用。

Terahertz beam reconfigurable micro-strip Quasi-Yagi-Uda antenna based on monolayer graphene

We propose a beam reconfigurable micro-strip quasi-Yagi-Uda(QYU)antenna operating at terahertz(THz)frequencies.The antenna,on a metal-backed SiO2 substrate,consists of a metallic micro-strip transmis⁃sion line,a metallic reflector,a metallic half-round micro patch,and three groups of monolayer-graphene-patch directors.Because the conductivities of the graphene patches can be electrically tuned,the radiation direction of the QYU antenna can be dynamically controlled by adjusting the bias voltages applied to the graphene patches.The basic properties and the tunable behaviors of the antenna are systemically simulated and optimized.It has very fast modulation speed and very low return loss.In particular,the numerical results show that the main radia⁃tion lobe angleφ(azimuth angle)of the QYU antenna can be swept from 30°to 150°inθ=60°(zenith angle)plane with different configurations of bias voltages applied to the graphene-patch directors.The proposed antenna is very suitable for THz beam reconfigurable applications,such as phased array radar systems.