激光与光电子学进展, 2017, 54 (3): 031602, 网络出版: 2017-03-08  

基于石墨烯的太赫兹方向图可重构天线 下载: 930次

Graphene-Based Antenna with Reconfigurable Radiation Pattern in Terahertz
耿莉 1,2谢亚楠 1,2原媛 1,2
作者单位
1 上海大学特种光纤及光接入网络重点实验室, 上海 200444
2 上海大学通信与信息工程学院, 上海 200444
摘要
为克服晶体管或者电子开关在太赫兹频段上的不足,将石墨烯应用于太赫兹可重构天线中。根据石墨烯表面电导率模型,分析了其面电导率随频率、化学势和温度的变化关系,以及表面阻抗与化学势的关系,证明了石墨烯应用于可重构天线的优势。设计了一款外加偏置电压的石墨烯方向图可重构天线,天线结构包括金属偶极子(有源振子)以及作为反射器/引向器的金属和石墨烯振子。利用改变化学势(外加偏置电压)的方式调节无源振子中石墨烯贴片的阻抗状态,改变电流分布,使得无源振子在反射器与引向器之间转换。通过HFSS软件的仿真优化,天线实现了在0°,±32°,±37°,±40°方向的辐射,工作频率在(1.07±0.06) THz范围内,相对带宽大于7.84%,辐射效率最高达89.96%。7个辐射方向中,最大辐射增益达8.312 dB。该天线具有体积小、重量轻、调控方式简便且稳定的优点,在太赫兹波束可重构天线领域有一定的应用价值。
Abstract
In order to overcome the deficiency of transistors or electronic switches in terahertz band, graphene is used in a terahertz reconfigurable antenna. Based on the model of graphene surface conductivity, the relationships of its surface conductivity to frequency, chemical potential and temperature, and the relationship between surface impedance and chemical potential are analyzed. Analysis of these relathionships proves the advantages of utilizing graphene in reconfigurable antennas. A graphene-based antenna with reconfigurable radiation pattern via applying external biased voltage is designed. The structure consists of a metal dipole (active element) and two metal with graphene dipoles as a reflector and a director. By altering chemical potential (external biased voltage), the states of graphene impedance configured in passive elements are adjusted and their current distribution is changed, which converts the passive ones between a reflector and a director. At last, through simulation and optimization of HFSS, the antenna realizes radiation with directions of 0°,±32°,±37°,±40°, operation frequency in (1.07±0.06) THz, relative impedance bandwidth over 7.84% and the maximum radiation efficiency of 89.96%. The maximum radiation gain has reached up to 8.312 dB at these seven radiation directions. This design has advantages as small size, light weight, simple and stable control, and offers a certain application value to beam-reconfigurable antenna in terahertz.

耿莉, 谢亚楠, 原媛. 基于石墨烯的太赫兹方向图可重构天线[J]. 激光与光电子学进展, 2017, 54(3): 031602. Geng Li, Xie Ya′nan, Yuan Yuan. Graphene-Based Antenna with Reconfigurable Radiation Pattern in Terahertz[J]. Laser & Optoelectronics Progress, 2017, 54(3): 031602.

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