微带线电路板端口对入射电磁波的电压响应
Coupling of external electromagnetic field to printed circuit board trace
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摘要: 在考虑电磁波与电子设备的耦合时，屏蔽腔中电路板端口对入射电磁波的电压响应是一个重要的参数。分别计算了微带线电路板端口在自由空间和在屏蔽腔内这两种不同情况下的电压响应，以及屏蔽腔内耦合系数的变化。对所得结果进行了比较分析，结果表明，在自由空间时，响应电压频谱为连续的变化，而在屏蔽腔内时，只有在本征模的频率处才会激励起端口电压，频谱分布变为分立的。当屏蔽腔上开有窄缝时，窄缝方向和入射场极化方向对激励起来的端口电压都有影响，而电场极化方向和微带线方向之间的关系，是决定端口激励电压大小的关键因素。Abstract: The voltage response of a printed circuit board (PCB) in a metallic shielding enclosure excited by an external electromagnetic field is an important factor when considering the coupling of an external electromagnetic field to electronic systems. In this paper, the voltage response of PCB excited by an external source is calculated under two conditions: in free space and in the shielding enclosure. The frequency spectrum of voltage is calculated. When the PCB is put into the cavity with a long slot, some cases are considered including different electric field directions of incident source and different slot shapes. The variance of coupling coefficient is also calculated．
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Key words:
- shielding enclosure /
- pcb /
- coupling /
- voltage response
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