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电磁波会通过屏蔽腔上的孔缝耦合到腔内并在电路板上激励起干扰电压,影响电子器件的正常工作。该文采用时域数值仿真,计算了一个微带线耦合滤波器分别在自由空间和屏蔽腔内时,在平面波的照射下端口电压响应,并通过Fourier变换得到频域响应。计算了不同入射电场方向、滤波器在屏蔽腔内的不同摆放位置对端口电压的影响,得到了各种情况下端口电压随频率的变化曲线。结果表明,放置在屏蔽腔中时,受屏蔽腔谐振特性的影响,滤波器的散射参数会变差,端口电压的频率响应也由自由空间的连续分布变为分立的谐振峰。在放置电路板时应尽量避免使滤波器的走线方向和开缝的方向垂直,同时还要考虑不同位置对端口电压的影响。
Electromagnetic waves are coupled into the cavity through apertures in the shield cavity and excite the interference voltage on the circuit board, affecting the normal operation of the electronics. In this paper, the time-domain numerical simulation is used to calculate the port voltage response of a microstrip line-coupled filter in free space and in the shield cavity under the illumination of plane waves. The frequency domain response is obtained by Fourier transform. The influences of different incident electric fields and different positions of the filters in the shielding cavity on the voltage of the port are calculated, and the curve of the port voltage with frequency is obtained under various conditions. The results show that when placed in the cavity, the scattering parameters of the filter deteriorate due to the resonant characteristics of the cavity. The frequency response of the port voltage also changes from the continuous distribution of free space to a discrete resonant peak. When placing the circuit board should try to avoid the filter alignment direction and the direction of the vertical slit, but also to consider the different positions on the port voltage.