How to deal with the electromagnetic radiation problem of PCB circuit board?
In the production process of multilayer PCB boards, electromagnetic radiation is a problem that deserves special attention. These electromagnetic radiations cannot exceed a limit, and the signal integrity of the system will be affected if the limit is exceeded. Cause major quality problems. So, how should we deal with the electromagnetic radiation problem of PCB circuit board?
In the eyes of engineers, the use of microstrip lines or strip lines is to provide a low-impedance transmission path for the signal. This is also a need for electromagnetic shielding in the eyes of EMC engineers. After using the microstrip line or strip line, the electromagnetic energy is controlled in the medium between the conductors. Why after using microstrip lines and strip lines, most of the electromagnetic energy will be trapped in the medium? The main reason is that the signal path is closer to the return path, so that the inductance of the entire loop is reduced.
Under high frequency conditions, if the signal has a good return path, the loop inductance it feels will be small, and the signal will be transmitted from the transmitter to the receiver according to people’s wishes; if the signal feels the loop inductance is very high Larger will cause radiation problems.
At low frequencies, electromagnetic interference can be ignored. At low frequencies, the electromagnetic field around the wire does not change so strongly, and the inductance effect of the wire will not be so obvious. However, at high frequencies, the electromagnetic field changes drastically, and the coupling between the signal path and the return path should be fully considered. The coupling between the signal path and the return path is used to reduce the inductance of the entire loop and control the electromagnetic energy emitted by the wire into the space.
The above is some analysis of the electromagnetic radiation problem of China PCB Manufacturer circuit board, I hope to help everyone.