基于插值的球面近远场变换精度提升方法  

A method for improving the precision of spherical near⁃field to far⁃field transformation based on biharmonic spline interpolation

作　　者：王天豪 贾云飞[1] 刘星汛 WANG Tianhao;JIA Yunfei;LIU Xingxun(College of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Beijing Institute of Radio Metrology and Measurement,Beijing 100085,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094 [2]北京无线电测量研究所,北京100085

出　　处：《电子设计工程》2024年第10期39-43,共5页Electronic Design Engineering

摘　　要：天线的远场方向图是研究天线特性的重要依据,近场测量技术能够通过天线的近场测量数据计算出天线的外推远场方向图,具有不依赖天气、成本低、速度快等优点,是一种有效的研究方法。有时探头故障、取样点间取样间隔过大或取样点不够密集会给结果带来较大的偏差。该文以球面近远场变换算法为基准,针对球面近场测量中探头有时出现故障的问题,利用HFSS仿真得到取样间隔不同的天线近场数据,利用计算机进行算法构建,通过将正常数据代入算法的手段验证球面近远场变换算法的正确性,而后引入双调和样条插值法对仿真出的问题近场测量数据进行修正,最后将所得结果与未修正前进行对比。对比结果表明,两方向的方向图平均误差分别减小了0.774 dB和1.3103 dB。The far field pattern of the antenna is an important basis for studying the characteristics of the antenna.The near⁃field measurement technology can calculate the extrapolated far field pattern of the antenna from the near⁃field measurement data of the antenna.It has the advantages of weather inde⁃pendence,low cost,fast speed,etc.It is an effective research method.Sometimes the probe fails,the sampling interval between sampling points is too large or the sampling points are not dense enough,which will bring great deviation to the results.In this paper,based on the spherical near⁃field and far⁃field transformation algorithm,aiming at the problem that the probe sometimes fails in the spherical near⁃field measurement,HFSS simulation is used to obtain antenna near⁃field data with different sampling intervals.The algorithm is constructed by computer.The correctness of spherical near⁃field and far⁃field transformation algorithm is verified by substituting normal data into the algorithm.Biharmonic spline interpolation is introduced to correct the simulated near⁃field measurement data.The results are compared with those before correction.The comparison results show that the average errors of the two directional patterns are reduced by 0.774 dB and 1.3103 dB respectively.

关 键 词：天线近远场变换 球模式展开理论 天线球面近场仿真 双调和样条插值法 

分 类 号：TN82[电子电信—信息与通信工程]