基于石墨烯的太赫兹方向图可重构天线

发布时间：2018-03-29 06:28

本文选题：材料　切入点：石墨烯天线　出处：《激光与光电子学进展》2017年03期

【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8.312dB。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 shortcomings of transistors or electronic switches in terahertz band, graphene was applied to terahertz reconfigurable antenna. The relationship between surface conductivity and frequency, chemical potential and temperature was analyzed according to the surface conductivity model of graphene. The relationship between surface impedance and chemical potential proves the advantage of graphene in reconfigurable antenna. A graphene pattern reconfigurable antenna with bias voltage is designed. The antenna structure includes metal dipoles (active dipoles) and metal and graphene dipoles as reflectors / guides. The impedance state of graphene patches in passive vibrators is adjusted by changing the chemical potential (plus bias voltage). By changing the current distribution, the passive oscillator can be converted between the reflector and the deflector. Through the simulation optimization of the HFSS software, the antenna can radiate in the direction of 0 掳, 卤32 掳, 卤37 掳, 卤40 掳, and the operating frequency is within 1.07 卤0.06)THz. The relative bandwidth is greater than 7.84 and the maximum radiation efficiency is 89.96.7. The maximum radiation gain is 8.312 dB. The antenna has the advantages of small size, light weight, simple and stable control mode. It has certain application value in the field of terahertz beam reconfigurable antenna.
【作者单位】：上海大学特种光纤及光接入网络重点实验室;上海大学通信与信息工程学院;
【分类号】：TN820

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