30 MHz～1 GHz辐射发射试验场地确认测试实例剖析

A Case Study of an EMI Test Site Validation over 30 MHz～1 GHz

场地衰减偏差是评估半电波暗室(SAC)是否满足30 MHz^1 GHz射频电磁场辐射发射测试要求的关键指标。针对某SAC场地衰减偏差的多次测量结果,从扫频测量参数、天线塔和电缆组件、测量天线的巴伦阻抗特性、溯源场地特性差异等方面进行剖析,讨论导致测量结果差异的主要因素。

Deviation of site attenuation is a critical index that is used to evaluate whether a semi-anechoic chamber （ SAC ） meets the requirements for radiated emission tests of radio-frequency electromagnetic field in the frequency range of 30 MHz to 1 GHz. The muhiple test results of deviation on site attenuation of a SAC, which were obtained from various perspectives, such as sweep frequency parameters, antenna tower and cable assembly, balun impedance characteristics of antenna, are ananlyzed. And the major factors resulting in the differences are discussed.