Controlling Electromagnetic Emissions from PCB Edges
It is a well-known fact that electromagnetic radiation can be emitted from the edges of printed circuit boards. When a current carrying via passes through two or more reference planes, an EM wave propagates radially away from the via within the cavity. When the wave meets the PCB edge, the two reference planes form a slot antenna and will radiate noise with the potential to generate electromagnetic interference (EMI) to nearby equipment.
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