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电磁混响室的系统造价低,测试时间短,对真实电磁环境的模拟更有效,在电磁兼容测试中,混响室在测试的准确性、可重复性以及测试不确定度等方面具有独特的优势。混响室在使用之前需要进行校准测试,以评估其性能,并获得几个重要的校准参数,其中接收天线校准系数和插入损耗是进行辐射发射测试前必需获得的参数。为了检验混响室测试的可重复性,利用清华大学建造的混响室,对混响室校准时的接收天线校准系数和插入损耗进行了实验研究。详细研究了发射天线位置、指向对其的影响。研究表明,发射天线位置、指向对校准的可重复性影响很小。实验结果证明了所用混响室能够产生时间和空间均很均匀的电磁场分布,能够满足测试要求。
The system of electromagnetic reverberation chamber is low in cost, short in test time and more effective in simulating the real electromagnetic environment. In the electromagnetic compatibility test, the reverberation chamber has unique characteristics in terms of accuracy, repeatability and test uncertainty Advantage. The reverberation chamber needs to be calibrated before use to evaluate its performance and obtain several important calibration parameters, of which the receive antenna calibration factor and insertion loss are necessary parameters for the radiation emission test. In order to test the repeatability of the reverberation chamber test, the calibration coefficient and insertion loss of the receiving antenna when the reverberation chamber is calibrated are experimentally studied by using the reverberation chamber built by Tsinghua University. A detailed study of the transmit antenna position, pointing to its impact. Research shows that the position and orientation of the transmitting antenna have little effect on the repeatability of the calibration. Experimental results show that the reverberation chamber used to produce a uniform electromagnetic field distribution in time and space can meet the test requirements.