太赫兹信号在几种塑料材料遮挡下的透射衰减  

Transmission attenuation of terahertz signal blocked by several plastic materials

作　　者：王心怡 卞诚真 李韦萍 张尧 余建军[1] WANG Xinyi;BIAN Chengzhen;LI Weiping;ZHANG Yao;YU Jianjun(School of Information Science and Technology,Fudan University,Shanghai 200433,China)

机构地区：[1]复旦大学信息科学与工程学院,上海200433

出　　处：《太赫兹科学与电子信息学报》2024年第5期516-522,共7页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(61835002,61935005,62305067,62375219,62331004)。

摘　　要：随着物联网时代的到来,人们对于更高带宽和更快速率的需求日益增加。太赫兹频段的引入为这一问题提供了一种新的解决方案。太赫兹信号具有穿透力强、对非金属材料具有较好的穿透性以及较高的分辨率等特点,在通信和成像领域具有巨大的潜力。本文基于光子辅助原理,搭建了利用光子外差拍频的方式产生386.2 GHz和438.4 GHz两个频率的太赫兹信号的太赫兹传输系统,并测量了太赫兹信号在聚4-甲基戊烯(TPX)、聚乙烯(PE)、聚丙烯(PP)和聚甲基丙烯酸甲酯(PMMA)这4种常见的塑料材质遮挡下的穿透损耗,得到了在室内环境下这些材料的衰减特性,且将实验结果与比尔吸收定律拟合。从实验结果发现5 mm厚的PP板和PE板对于太赫兹信号的衰减在1 dB以下,很薄的PP板和PE板对386.2 GHz和438.4 GHz两个频率的太赫兹信号的遮挡作用很微弱;实验所选频段的太赫兹信号几乎无法穿透15 mm厚的PMMA板。太赫兹信号在塑料材质中的透射衰减特性的探索与研究对毫米波通信系统中合适的天线材料的选择具有参考价值,在实际应用中起着重要的指导作用。With the advent of the Internet of Things era,people's demand for higher bandwidth and faster speed is increasing.The introduction of the terahertz frequency band provides a new solution to this problem.Terahertz signals bear the characteristics of strong penetrating power,good penetrability to non-metallic materials,and high resolution,and show great potential in the fields of communication and imaging.Based on the principle of photon assistance,a terahertz transmission system that uses photon heterodyne beat frequency to generate terahertz signals at two frequencies of 386.2 GHz and 438.4 GHz is built.And the penetration of terahertz signals is measured under the obstruction of four common plastic materials:poly4-methylpentene(TPX),polyethylene(PE),polypropylene(PP) and polymethyl methacrylate(PMMA).The attenuation characteristics of these materials in indoor environments are obtained,and the experimental results are fitted with Beer's absorption law.From the experimental results,it is found that the attenuation of terahertz signals by 5 mm thick PP board and PE board is below 1 dB,and the blocking effect of thin PP board and PE board on terahertz signals at 386.2 GHz and 438.4GHz is very weak;terahertz signals in the frequency band selected for the experiment can hardly penetrate the 15 mm thick PMMA plate.The exploration and research on the transmission attenuation characteristics of terahertz signals in plastic materials has reference value for the selection of suitable antenna materials in millimeter-wave communication systems,and plays an important guiding role in practical applications.

关 键 词：太赫兹信号 光子外差拍频 穿透损耗 衰减特性 

分 类 号：TN92[电子电信—通信与信息系统]