Calculation model of critical radiated interference E-field intensity in reverberation chamber
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摘要: 为解决均匀场与混响室内辐射敏感度测试结果相关性较差的问题，利用统计学理论对混响室内场强直角分量及天线接收功率的统计特性进行分析，理论推导出基于受试设备干扰概率的混响室条件下临界辐射干扰场强计算模型。为验证该模型的正确性，以ETS 3142E型天线为受试设备分别在混响室及均匀场中进行临界辐射干扰场强测试，实验结果表明，利用该计算模型得出的临界辐射干扰场强值与均匀场测试结果吻合良好，平均相对误差可控制在2 dB以内，可将该模型应用于实际辐射敏感度测试。Abstract: In order to solve the problem of the poor correlation of the radiation susceptibility test results between uniform field and reverberation chamber, this paper analyzes the statistical characteristics of the E-field rectangular component and the antenna's received power in reverberation chamber with statistical theory, and a calculation model of critical radiated interference E-field intensity base on the failure probability of equipment under test is derived. To verify the correctness of the calculation model, the ETS 3142E antenna is taken as equipment under test to perform the critical radiated interference E-field intensity test in uniform field and reverberation chamber. The experiment result shows that the critical radiated interference E-field intensity obtained by the calculation model is well consistent with the test result in uniform field, and the average relative error can be decreased to 2 dB, which indicates that this calculation model can be applied to' actual radiation susceptibility test.
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Key words:
- reverberation chamber /
- uniform field /
- radiation susceptibility /
- correlation
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图 2 混响室内统计规律验证
Figure 2. Statistical property validation of experiment data in reverberation chamber
图 4 临界辐射干扰场强的理论值与实测值比较
Figure 4. Comparison of theoritical and measured values of critical radiated interference E-field intensity
表 1 混响室试验数据
Table 1. Experiment data in reverberation chamber
frequency/MHz G/dBi σ/(V·m-1) Ws/dBm P=40% P=60% P=80% 300 6.3 8.04 -44.56 -47.06 -50.58 400 5.2 6.76 -42.20 -44.76 -48.12 500 6 9.93 -42.26 -44.95 -49.70 600 5.7 6.89 -42.39 -45.02 -48.03 700 5 9.34 -42.20 -45.60 -48.32 800 5 7.68 -41.70 -43.2 -46.80 
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表 2 开阔场试验数据
Table 2. Experiment data in open area
frequency/MHz Pout/dBm Es/(V·m-1) P=40% P=60% P=80% P=40% P=60% P=80% 300 -7.5 -10.2 -13.7 5.58 4.08 2.71 400 -3.9 -0.2 -3.6 5.28 4.05 2.77 500 -5.1 -7.4 -12.1 2.70 2.06 1.18 600 -1.2 -3.9 -6.8 6.35 4.65 3.3 700 -2 -0.6 -3.4 8.24 7.65 5.56 800 -1 -2.5 -6.1 4.65 3.90 2.58
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表 3 不同频率下相对误差及均值
Table 3. Relative errors at different frequency and mean value
frequency/MHz ε1/dBm ε2/(V·m-1) P=40% P=60% P=80% P=40% P=60% P=80% 300 -0.43 -0.25 -0.29 5.80 5.98 5.94 400 -0.62 -0.86 -1.15 4.78 4.54 4.25 500 2.72 2.47 3.54 8.74 8.49 9.56 600 -2.45 -2.28 -2.89 3.35 3.52 2.90 700 -1.51 -2.03 -2.71 3.72 3.20 2.52 800 1.77 0.76 0.75 7.00 5.99 5.98 mean value 1.48 1.32 1.71 5.77 5.48 5.53
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