Method of analyzing shielding effectiveness of complex thin slots based on CP-FDTD
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摘要: 围绕强电磁脉冲的细缝“后门”耦合问题，介绍了基于CP-FDTD的细缝屏蔽效能分析高效数值模拟方法。在证明CP-FDTD准确性的基础上，从入射电磁场极化方向、入射角度和计算效率三个方面进行了详细分析，验证了CP-FDTD在处理工程复杂细缝电磁脉冲耦合时的适用性。通过将CP-FDTD算法集成于自主研发软件JEMS-FDTD，形成可以高效分析工程复杂细缝屏蔽效能的数值模拟方法，并应用于工程部件细缝结构的屏蔽效能分析。Abstract: In this paper, based on the "back-door" coupling problem of the electromagnetic pulse, the high-efficiency numerical simulation method based on CP-FDTD is proposed. On the basis of proving the accuracy of CP-FDTD, the detailed analysis of the incident electromagnetic field polarization direction, incident angle and calculation efficiency is carried out, and the applicability of CP-FDTD in the processing of complex slot electromagnetic pulse coupling is verified. By integrating the CP-FDTD algorithm into the self-developed software JEMS-FDTD, a numerical simulation method can be formed to efficiently analyze the shielding effectiveness of engineering complex slots, and it is applied to the shielding effectiveness analysis of engineering component structures.
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Key words:
- CP-FDTD /
- complex slots /
- shielding effectiveness /
- JEMS-FDTD /
- numerical simulation
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图 3 入射电磁场的极化角度示意图
Figure 3. Diagram of polarized angle of incident electromagnetic field
表 1 MAV和ρ随极化角α的变化
Table 1. Variation of MAV and ρ along with α
α/(°) MAV/dB ρ P1 P2 P3 P1 P2 P3 90 0.915 4 1.165 0 1.616 0 0.989 3 0.986 0 0.976 2 60 0.640 3 0.934 2 1.300 0 0.995 5 0.991 4 0.984 0 30 0.664 8 0.851 4 1.102 0 0.995 6 0.993 9 0.985 5 0 1.364 0 1.220 0 1.694 0 0.994 9 0.997 9 0.989 1 
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表 2 观察点P1处MAV和ρ随入射角度的变化
Table 2. Variation of MAV and ρ along with incident angle at P1
θ/(°) MAV/dB ρ φ=90 φ=60 φ=30 φ=90 φ=60 φ=30 90 0.915 4 1.038 0 1.567 0 0.989 3 0.988 4 0.969 8 60 0.753 5 0.582 9 0.665 8 0.995 1 0.996 9 0.995 3 30 0.884 5 0.673 6 0.660 6 0.994 3 0.996 6 0.995 3
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表 3 观察点P2处MAV和ρ随入射角度的变化
Table 3. Variation of MAV and ρ along with incident angle at P2
θ/(°) MAV/dB ρ φ=90 φ=60 φ=30 φ=90 φ=60 φ=30 90 1.165 0 1.304 0 1.108 0 0.986 0 0.984 2 0.983 8 60 0.969 7 0.621 5 0.692 3 0.991 3 0.997 3 0.996 5 30 0.980 1 0.696 0 0.708 9 0.992 0 0.997 0 0.996 2
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表 4 观察点P3处MAV和ρ随入射角度的变化
Table 4. Variation of MAV and ρ along with incident angle at P3
θ/(°) MAV/dB ρ φ=90 φ=60 φ=30 φ=90 φ=60 φ=30 90 1.616 0 1.591 0 1.460 0 0.976 2 0.976 4 0.975 4 60 1.140 0 1.038 0 0.937 4 0.979 5 0.978 6 0.985 1 30 1.204 0 1.031 0 0.994 3 0.994 5 0.980 3 0.979 6
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表 5 Fine-FDTD与CP-FDTD计算效率对比
Table 5. Comparison of calculation efficiency between fine-FDTD and CP-FDTD
model method number time/min horizontal slot fine-FDTD 337.49 303.03 CP-FDTD 111.87 94.11 circular slot fine-FDTD 764.71 1 630.43 CP-FDTD 111.87 95.23 complex slots fine-FDTD 764.71 1 666.67 CP-FDTD 111.87 98.46
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