宽带超高频局放检测壳装天线设计方法研究  

A design of the UHF antenna with metallic shell for PD detection

作　　者：郭宏福[1] 付咪[1] 许彩祥[1] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071

出　　处：《电波科学学报》2011年第6期1212-1217,共6页Chinese Journal of Radio Science

摘　　要：用于局部放电(PD)检测的宽带超高频(UHF)天线在实际应用中需要加金属壳来屏蔽外界电磁干扰,使得天线频带和驻波比特性发生改变,无法满足PD信号测量要求的宽带特性。本文提出采用吸收材料对局放宽带UHF检测天线驻波比进行改善,对加装金属壳后天线方向性与增益、驻波比等特性变化进行了仿真与分析,重点分析了吸收材料尺寸对天线性能的影响及改善程度,实际设计了一种带有金属腔的局部放电宽带UHF测量天线,实测了增加金属腔、吸收材料对天线各方面性能的影响变化。分析与测量结果表明:金属腔使天线方向性与增益增强、阻抗带宽和驻波比特性变差,在金属腔内增加介质吸收材料可以有效改善天线阻抗带宽和天线驻波比特性,满足PD测量中对UHF天线的带宽要求。为实际PD测量中UHF天线设计提供理论与实践依据。The broad-band UHF antenna used for Partial discharge（PD）detection needs to be fitted in the metallic shell in order to shield from the external radio interference,which makes the antenna characters change,leading to the fact that the antenna broadband character can not meet the requirements of the PD signal measurement.This paper presents a novel approach to improve the Voltage standing wave ratio（VSWR） by adding absorbing materials in the shell,and simulates the characters of the antenna by Ansoft HFSS.Moreover,the influence of different absorbing material dimensions on the antenna characters is analyzed.A PD detection broad-band UHF antenna with metallic shell is designed and experimentally tested.The analysis results show that the antenna directivity is changed and the antenna gain is enhanced,and the VSWR deteriorates with the metallic shell.By adding the absorbing material in the metallic shell to achieve better VSWR,the impedance bandwidth of the proposed antenna meets the requirements of the PD signal measurement broadband characters.This novel approach provides theoretical and practical guidance and reference for the design of actual PD UHF antenna

关 键 词：UHF 宽带天线 局放检测 金属腔 驻波比 

分 类 号：TN82[电子电信—信息与通信工程]