静电放电电磁场与金属腔体孔缝耦合的数值研究
Numerical study on coupling of electrostatic discharge electromagnetic fields into a metallic cavity through an aperture BI Zeng-jun，LIU Shang-he
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摘要: 用时域有限差分方法研究了静电放电火化产生的电磁场在其近场区域与带孔缝金属腔体的耦合问题，基于修正的静电放电火化偶极子模型和脉冲函数放电电流解析表达式，建立了耦合数值模型，经过计算分析表明，腔体内孔缝周围分布着比较强的静电感应场，而耦合进腔体的瞬变场可以使腔体发生TE101模为主的腔体谐振，但谐振幅度不大。Abstract: In this paper, coupling of electromagnetic fields generated by electrostatic discharge (ESD) spark in near area into a metallic cavity with an aperture is studied by using Finite-Difference Time-Domain (FDTD) method and a numerical coupling model is established, which is based on the revised electric dipole model of electrostatic discharge spark and the discharge current analytic expression obtained by pulse function. The analysis of the calculated results shows that there is strong electrostatic induction field at the vicinity of the aperture in the cavity and the transient field coupled in the cavity can resonate the cavity with the TE-101 mode as the leading mode, but the amplitude of the resonance is very low.
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Key words:
- electrostatic discharge spark /
- numerical model /
- electromagnetic field /
- coupling
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