在350kHz~30MHz频段内,为了准确得到环天线所处位置的场强,环天线的天线系数需要校准。三天线法是一种校准天线系数的绝对方法,需要3个环天线,两两组对测量,且不需要任何参考标准。介绍了三天线法校准环天线的原理,基于矢量网络分析仪建立校准系统,并评定校准系统的测量结果不确定度。基于K(i,j)的计算公式复杂,很难计算出其引入的不确定度,因此采用数字电磁学代码(NEC)建模评定K(i,j)的不确定度。评定结果表明,在350kHz~30MHz频段内4个典型频点的扩展不确定度小于0.81dB(k=2)。
Abstract
In the 350kHz~30MHz frequency band, in order to accurately obtain the field strength where the loop antenna is located, the antenna factor of the loop antenna needs to be calibrated. The three-antenna method is an absolute method for calibrating the antenna factor.Antenna calibration using the three-antenna method requires three antennas to form three antenna pairs and does not require any reference standard.TAM is discussed in detail, a calibration system based on a vector network analyzer is set up, and the standard uncertainty of the calibration system is evaluated.It is not possible to derive the uncertainty introduced by the calculation formula based on K(i,j). Therefore, the numerical electromagnetics code (NEC) simulations are used to evaluate the uncertainty of K(i,j). The evaluation results show that the extended uncertainty of the four typical frequency points in the 350kHz~30MHz frequency band is less than 0.81dB (k=2).
关键词
计量学 /
环天线 /
天线系数 /
三天线法 /
校准 /
标准不确定度
Key words
metrology /
loop antenna /
antenna factor /
threee-antenna method /
calibration /
uncertainy
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基金
国家自然科学基金(86567370);国家自然科学基金青年基金(56312680);国家重点研发计划 (2018YFF0212102);中国科学研究院能力提升项目(ANL1906);河南省教育厅高等学校重点科研项目(20A510004);粮食信息处理与控制教育部重点实验室开放课题(KFJJ-2018-102)
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