The Coupling Study between PCB Board-Level MSL in Slotted Cavity and Electromagnetic Pulse

The current produced by the coupling between the MSL and the external electromagnetic energy will cause damage to sensitive devices. But the research is not enough at present. The PCB board with a corner MSL in the slot shelled is built as the research object. Using current as the main entry point, the multi parameter coupling is calculated. First, the corresponding model is established and validated. The plane wave excitation is used to investigate the influence for current. The Parameters include the different positions, whether there is a shielding cavity, the MSL angle size and the corner compensation. The results show: the currents of the different positions have little effect for the straight MSL. The value of straight MSL is greater than the one of bend MSL, and the difference decreases with the increasing frequency. At the resonance point, the suppression effect of the cavity is weakened or even completely ineffective; When MSL and E are placed in parallel, it can be arranged into short trace, When MSL and E is placed vertically, it can be arranged into long trace. With the increase of MSL width, the current will increase, but the trend will slow down. The corner compensation is effective for improving SI, but it is limited for the electromagnetic coupling. The resonant point position is not affected due to the multi parameters variation is the common result.