Simulating and verifying the electromagnetic interference on the four-layer PCB

This paper simulates and verifies the conducted interference of EMI on the basis of four-layer template, and proposes to suppress the noise by destroying the resonant cavity or the return current. One suppression proposal which designs a planar passive circuit, which is placed on the metal plane of the resonant cavity, forming a special pattern, it can be a filter, transformer or divider, suppressing noise at a specific frequency, the other one is using the differential signal. Finally, we mainly using HFSS to simulate the scattering parameters of the top transmission line and the line of differential signal to verify the EMI effect on the four-layer template.