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应用时域有限差分法(FDTD)模拟计算了微波脉冲与带缝非金属腔体的线性耦合过程。在正弦波调制的高斯脉冲源激励下,分析了耦合场在腔体内的分布情况,总结了相对介电常数、腔壁厚度、孔缝尺寸等因数对耦合特性影响的基本规律。结果表明:在入射电场方向腔体中心轴线上的耦合场基本保持不变,垂直于入射电场截面上耦合场关于截面中心点呈对称分布;耦合进腔体的能量随厚度的增加和介电常数的增大而减小,但介电常数的影响更加明显,且随孔缝面积的增大而增大,面积一定时,随纵横比的增大而增大;孔缝中心处的电场耦合系数峰值随介电常数的增大呈近似线性下降,而腔体中心处呈振荡减小,在相对介电常数为6左右电场时域峰值达到最大;腔体内耦合磁场的变化规律与电场的类似。
The FDTD method was used to simulate the linear coupling between the microwave pulse and the non-metal cavity with slit. Under the excitation of Sine wave modulated Gaussian pulse source, the distribution of the coupling field in the cavity is analyzed. The basic rules of the influence of the relative permittivity, cavity wall thickness and pore size on the coupling characteristics are summarized. The results show that the coupling field in the central axis of the incident electric field basically remains unchanged and the coupling field perpendicular to the incident electric field is symmetrical about the central point of the cross section. The energy of the coupled cavity increases with the increase of the thickness and the dielectric constant , But the influence of dielectric constant is more obvious, and increases with the increase of pore area. When the area is constant, it increases with the increase of aspect ratio. The electric field coupling coefficient The peak value decreases linearly with the increase of the dielectric constant, but decreases in the center of the cavity. The peak of the electric field reaches the maximum at a relative permittivity of about 6. The variation of the coupling magnetic field in the cavity is similar to that of the electric field.