矿井巷道无线传输超表面反射测试分析  

Analysis of metasurface reflection tests for wireless transmission in mine roadways

作　　者：李昀 罗伟[3] 尹波[3] 李小亮 LI Yun;LUO Wei;YIN Bo;LI Xiaoliang(State Key Laboratory of Coal Mine Disaster Prevention and Control,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400039,China;College of Optoelectronic Engineering,Chongqing University,Chongqing 400065,China)

机构地区：[1]煤矿灾害防控全国重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400039 [3]重庆邮电大学光电工程学院,重庆400065

出　　处：《工矿自动化》2025年第2期41-47,56,共8页Journal Of Mine Automation

基　　金：国家重点研发计划项目(2022YFB4703603);煤矿灾害防控全国重点实验室2022年开放基金项目(2022SKLKF12)。

摘　　要：高频无线电磁波在弯曲巷道、巷道拐角处传输损耗大,造成信号盲区。针对该问题,提出采用超表面反射技术进行无线信号覆盖补盲。改进超表面阵列单元传统的十字结构,通过嵌入多级嵌套的矩形振子和改变内部十字尺寸,获得了330°相移范围和良好的线性相移曲线,并基于改进的十字结构设计制作了超表面反射装置。选择5.8 GHz超高频频段,针对清水溪巷道起坡段弯曲巷道和主辅段岔口,仿真并现场测试了超表面反射装置的信号增强效果。结果表明,在入射距离与接收距离固定、发射天线结构不同的情况下,无论是在起坡段弯曲巷道还是主辅段岔口位置,安装超表面反射装置后无线信号的信噪比、参考信号接收功率均得到不同程度的增强,采用线极化喇叭状定向天线时信号增强效果最优,实测参考信号接收功率增益最大值为13 dB。分析指出矿井巷道中应用超表面无源反射技术存在入射波角度难对准、波束难集中、入射距离短等问题,结合测试结果推断矿井巷道岔口处适合固定安装超表面反射装置用于点对点传输补盲。High-frequency wireless electromagnetic waves suffer significant transmission loss in curved roadways and at roadway corners,resulting in signal blind spots.To address this issue,a metasurface reflection technique was proposed to enhance wireless signal coverage and mitigate signal blind spots.The traditional crossshaped structure of the metasurface array unit was improved,and a 330°phase shift range and a well-defined linear phase shift curve were achieved by embedding multi-level nested rectangular resonators and adjusting the internal cross dimensions.Based on this,a metasurface reflection device was designed and fabricated.Using the 5.8 GHz ultra-high frequency band,simulations and field tests were conducted to evaluate the signal enhancement performance of the metasurface reflection device in the inclined curved section and the intersection of main and auxiliary sections in the Qingshuixi roadway.The results showed that,with fixed transmission and reception distances and different transmission antenna structures,the installation of the metasurface reflection device enhanced both the signal-to-noise ratio and the reference signal receiving power to varying degrees in both the inclined curved section of roadways and the intersection of main and auxiliary sections.The enhancement was most significant when using a linearly polarized horn directional antenna,with a maximum gain of 13 dB in received reference signal power.The analysis highlighted challenges in applying passive metasurface reflection technology in mine roadways,including difficulties in aligning the incident wave angle,focusing the beam,and achieving sufficient wave incidence distance.Based on the test results,fixed installation of metasurface reflection devices at roadway intersections is recommended for point-to-point transmission blind spot mitigation.

关 键 词：矿井无线传输 巷道信号覆盖补盲 无线信号增强 超表面反射 超表面阵列设计 

分 类 号：TD655[矿业工程—矿山机电]