The wave absorbing material reduces the interference of the edge of the printed circuit board (PCB) and can be fixed by opening a U-shaped groove on the edge of the circuit board. Its absorption attenuation is large, and reflection attenuation is small. By gradually absorbing energy and converting it into heat energy, it reduces radiation or plays a "protective" role.
Through proper use of PCB design techniques, such as routing, stacking distribution, decoupling and termination, the radiation generated by the printed circuit board itself can be minimized. However, the PCB printed circuit board assembly still has several other radiation source mechanisms. These mechanisms include the component itself, the cavity resonance effect of the power/signal return layer, and the edges of the printed circuit board. Edge effect is a very serious problem, because the edge of the circuit board is very close to the chassis shell, so the generated radiation field can excite current on the chassis structure frame.
There are a lot of research and analysis of various methods and technologies to reduce the edge radiation effect of PCB printed circuit boards, such as proper termination technology. A problem that arises with the application of these technologies is that additional components may need to be added and take up valuable PCB board space, and the actual effect is often not reducing the radiated energy. These common methods will produce energy reflection, which may produce additional internal resonance effects and internal through-hole coupling, which will lead to increased radiation.
Lay the absorbing material along the edge of the PCB printed circuit board, which can reduce the edge radiation caused by the edge, and does not require additional area of the circuit board. By consuming energy, the energy is not reflected back to the circuit board, and the absorbing material can also reduce the possibility of circuit board resonance problems.
The absorbing material is soft and has excellent flexible die-cutting processability. It is light and thin and easy to use. It can be installed in a small space and can be attached to a proper position in the device; because it converts electromagnetic energy into heat energy, it is not necessary to use "grounding" Measures. As long as the absorbing material blocks the field or is placed on the propagation path of the field, it can reduce the electromagnetic energy of the field.