混波室时频域综合法天线效率测试技术  

Measurement Method for Antenna Efficiency Based on Time & Frequency Domain Measurement in Reverberation Chamber

作　　者：周忠元[1] 周香[1] 沈博文 ZHOU Zhongyuan;ZHOU Xiang;SHEN Bowen(School of Mechanical Engineering, Southeast University, Nanjing 211189, China;Nanjing Ship Radar Research Institute, Nanjing 211153, China)

机构地区：[1]东南大学机械工程学院,南京211189 [2]南京船舶雷达研究所,南京211153

出　　处：《高电压技术》2017年第12期3994-3999,共6页High Voltage Engineering

基　　金：技术基础科研项目(YXDND20141BZ02)~~

摘　　要：为了实现天线效率的准确测试,分析改进了现有混波室时频域综合法天线效率测试技术。通过使用带有时域分析功能的矢量网络分析仪、利用时域带限脉冲激励混波室测试获得混波室的时域插入损耗。考虑到发射天线与接收天线工作状态的不同,分别采用混波室中以及自由空间中的端口反射系数测试结果修正天线端口的阻抗失配。理论分析了时域测试中由于脉冲带宽不为零导致的天线效率测试误差,结果表明在时域脉冲带宽为300 MHz时,此误差项<0.11 d B,可以忽略。对超宽带单极子天线的仿真与试验结果显示:在3~8.5 GHz频段内天线效率的仿真与实测值差异较小,最大为0.295 d B,表明改进的方法能够较准确地对受试天线的效率进行测试。In order to test the antenna efficiency accurately, measurement method for antenna efficiency based on the time ＆ frequency domain measurement in a reverberation chamber （RC） is improved in this paper. By using the vector network analyzer （VNA） with a time domain option, the time constant and insertion loss of a RC can be measured and calculated. When measuring the time constant of a RC, the bandpass impulse should be used to make sure that the measurement results can be compared with continuous wave （CW） results taken at a specific frequency. When doing the antenna impedance mismatch correction in frequency domain, the S11 of transmitting antenna should be measured in a RC and the S22 of receiving antenna should be measured in free space. The antenna efficiency testing error caused by the nonzero pulse bandwidth is evaluated, which shows that 300 MHz pulse bandwidth will lead to an error of 0.11 dB. The simulation and measurement results show that when the testing frequency range is from 3 GHz to 8.5 GHz, the maximum difference between the testing and simulating results is 0.295 dB. It shows that antenna efficiency can be measured accurately with the method proposed in this paper.

关 键 词：天线效率 时域测试 插入损耗 混波室 阻抗失配修正 

分 类 号：TN820[电子电信—信息与通信工程]