回波损耗补偿在低频段天线测试中的应用与验证  

Application and Verification of Lower Frequency Antenna Measurement With Return Loss Compensation

作　　者：魏世京[1] 张麟兮[1] 郭静远[1] 

机构地区：[1]西北工业大学无人机特种技术重点实验室,陕西西安710065

出　　处：《测控技术》2012年第11期104-106,110,共4页Measurement & Control Technology

基　　金：航天科技创新基金资助项目(YY-F09024);西北工业大学研究生创业种子基金资助项目(Z2011108)

摘　　要：采用间接时域测量技术测试低频段天线时,测试带宽受到天线工作带宽的限制,导致距离分辨率差、无法精确加门,针对这一问题第一次提出利用回波损耗补偿进行带宽扩展的方法,即使扫频带宽大于天线的工作带宽,在后期的数据处理中,将天线的回波损耗补偿到其频域响应上,补偿后的值与天线在整个扫频带宽内无反射、入射能量全部辐射到自由空间时的频域响应相等,达到带宽拓展的目的。对所提出的方法进行了数学模型推导,并在HFSS和Matlab中进行了仿真验证,结果表明经过回波损耗的补偿修正,所得到的方向图与标准方向图相吻合。Using indirect time-domain measurement techniques to test lower frequency antenna, test bandwidth is limited by the antenna operating bandwidth, the restrictions resulted from the resolution is poor, the gating window can not be accurately imposed. To solve this problem, the method that uses compensation for return loss to expand bandwidth is presented for the flint time, even if the sweep bandwidth is greater than the operating bandwidth of the antenna, in the data processing of the latter part, the return loss of the antenna is compensated to its frequency domain response, the value after compensation equals to the frequency domain response of the antenna when it has no reflection in the entire sweep bandwidth, all the incident energy is radiated into free space, the purpose of expanding the bandwidth is achieved. The derivation of the mathematical model for the proposed method is given, and its simulation and verification are made by HFSS and Maflab. The results show that after the correction of compensation for the return loss, the resulting pattern is consistent with the standard pattern.

关 键 词：回波损耗 低频段天线 带宽扩展 方向图测试 

分 类 号：TN98[电子电信—信息与通信工程]