Experimental Study on the Influence of Input Power on Characteristic Parameters of Electromagnetic Reverberation Chambers
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摘要: 电磁混响室的校准通常是在较低输入功率下面向场均匀性和归一化场强等特征参数进行,但在电磁兼容抗扰度测试等实际应用中,实际工作在较高输入功率条件下,目前相关国际和国内标准中对此差异是予以忽略的,没有给出具体理论或实验证明。设计并开展了具体的实验研究,确认了输入功率对电磁混响室特征参数的影响程度。其中,低输入功率下的校准采用基于三维光电场探头的快速校准技术方案,高输入功率下的参数测量与汽车零部件抗扰度测试的实际工作状态保持一致。实验结果表明,不同输入功率对场均匀性这一特征参数的影响基本在±0.5 dB以内,对归一化场强的影响在2 dB以内。进一步的,基于对实验结果的分析,给出了相应的电磁混响室校准和测试过程中对场均匀性和归一化场强标定的建议。Abstract: Electromagnetic reverberation chambers are typically calibrated for characteristic parameters such as field uniformity and normalized field strength under low input power conditions. However, in practical applications like electromagnetic compatibility immunity testing, these chambers operate under high input power conditions. Currently, relevant international and domestic standards ignore this difference, providing no specific theoretical or experimental evidence. This paper presents a designed experimental study to investigate the influence of input power on the characteristic parameters of electromagnetic reverberation chambers. A rapid calibration technique using 3D photoelectric field probes was employed for low input power calibration, while high input power parameter measurements were conducted under conditions consistent with actual automotive component immunity tests. Results show that the impact of different input power levels on field uniformity is generally within ±0.5 dB, and the effect on normalized field strength is within 2 dB. Based on these findings, recommendations are provided for calibrating field uniformity and normalized field strength during electromagnetic reverberation chamber calibration and testing processes.
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表 1 低输入功率条件下的测试主要设备及附件
Table 1. Main testing equipment and accessories for low input power conditions
设备名称 型号 主要参数 矢量网络分析仪 ZVA24 频段:200 MHz~18 GHz 发射天线 HL223 频段:200 MHz~1.3 GHz 光电转换控制器 OEFS-C5-A10 频段:0.1 MHz~10 GHz 三维光电场探头 SH-10EX 频段:0.1 MHz~10 GHz 表 2 高输入功率主要设备及附件
Table 2. Main equipment and accessories for high input power conditions
设备名称 型号 主要参数 信号源 E8257C 频段:250 KHz~40 GHz 频谱仪 FSW 频段:200 MHz~13.6 GHz 发射天线 HL223 频段:200 MHz~1.3 GHz 光电转换控制器 OEFS-C5-A10 频段:0.1 MHz~10 GHz 三维光电场探头 SH-10EX 频段:0.1 MHz~10 GHz 功率计 E4412A 频段:10 MHz~18 GHz 定向耦合器 C8998-10 频段:100 MHz~3 GHz 功率放大器 NPWPA-00810200 频段:80 MHz~1 GHz -
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