三天线法环天线校准系统建立及测量结果不确定度评定

doi:10.3969/j.issn.1000-1158.2021.10.16

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摘要在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)。

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	秦瑶
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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

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).

Key words： metrology loop antenna antenna factor threee-antenna method calibration uncertainy

收稿日期: 2020-04-20 发布日期: 2021-10-18

PACS:

TB973

基金资助: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)

通讯作者: 刘潇(1983-),女,辽宁大连人,中国计量科学研究院副研究员,从事天线和场强计量技术研究。Email:liuxiao@nim.ac.cn E-mail: liuxiao@nim.ac.cn

作者简介: 秦瑶(1981-),女,河南洛阳人,河南工业大学副教授,从事电磁测量技术、微波信号处理研究。Email:eqinyao@163.com

引用本文:

秦瑶,吴艳丽,刘潇. 三天线法环天线校准系统建立及测量结果不确定度评定[J]. 计量学报, 2021, 42(10): 1367-1371.
QIN Yao,WU Yan-li,LIU Xiao. The Loop Antenna Calibration System using the Three-Antenna Method and the Uncertainty Estimation for the Measurement Results. Acta Metrologica Sinica, 2021, 42(10): 1367-1371.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2021.10.16 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2021/V42/I10/1367

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