【摘要】 评测中国计量科学研究院(NIM)新建反射试验场测试装置的准确性,需要足够准确的基准值。通过分析对比矩量法模型与实测模型,设计制作了一种小馈源偶极子天线,根据矩量法准确性与收发天线间距无关这一特性的近场法,分析了近场法在实测中的误差缩减效应,然后据此验证了基准值的准确性(在30 MHz~1 GHz频段24个典型频率点的场地插入损耗偏差小于0.22 dB,相当于天线系数误差小于0.11 dB)。在30 MHz~1 GHz频段10 m距离条件下对NIM新建测试装置的评测结果为:在24个典型频点,水平极化时偏差小于0.26 dB,垂直极化时偏差小于0.34 dB;在频率间隔1 MHz的扫频范围内,垂直极化时偏差小于0.6 dB。更多还原

【Abstract】 The Improvement methods are proposed to calculate and verify the very precise site insertion loss(error less than 0.22 dB) between a pair of dipole antennas at the 24 resonant frequencies from 30 MHz to 1 GHz,to adequately validate NIM’s newly established ground reflection range of high performance.Careful comparison is made between the MoM model of calculable dipole antennas and practical measurement setup,which provides profound insight into the errors of calculable dipole antennas and measurement,and is used to improve the accuracy of the broadband calculable dipole antennas.The accuracy of the calculable dipole antennas is verified,based on the " effect of error mitigating" of near-field method.Finally,the performance of NIM’s newly established precise ground reflection range are validated per CISPR 16-1-5 with the optimized calculable dipole antennas,and the deviation between measurement and simulation is less than 0.26 dB for horizontal polarization,and 0.34 dB for vertical polarization at 10 m range.更多还原