微波耦合场测量圆环探头的接收特性

 为了准确测量腔体等封闭狭小空间内微弱耦合电磁场，对一般小型圆环同轴探头的连接端面进行斜面剖分优化处理。采用时域有限差分方法，模拟了在电磁脉冲平面波激励下，圆环斜面探头所感应电压的时域变化过程。通过数值模拟计算，对比分析了３种不同角度斜面圆环探头的电磁接收频率响应特性，得出带有15°斜面圆环探头的高频接收性能相应提高2~5 dB。开展直径40 mm圆环15°斜面探头的电磁接收测量实验，并与相应计算结果进行对比分析，其二者整体变化趋势基本吻合，从而验证了数值计算分析探头电磁接收特性结果的准确性。

Receiving characteristics of loop probe for microwave coupling field measurements

The connecting face of small loop probe is optimized with slope cutting, so that the probe can exactly measure weak coupling electromagnetic field in the cavities. Under the irradiation of electromagnetic pulse, the change of voltage in loop probe is simulated by FDTD. The receiving characteristics of three loop probes with different slopes are calculated. The high frequency receiving capability of loop probe with 15° slope is improved by 2~5 dB. The receiving experiments of 40 mm diameter loop probe with 15° slope are conducted. Measurement result is compared with calculation result, whose change trends coincide well in the main, which proves credibility of numerical analysis．