It is a well-known fact that electromagnetic radiation can be emitted from the edges of printed circuit boards (PCBs) [1], [2]. When a current carrying via passes through two or more reference planes, an EM wave propagates radially away from the via within the cavity, as shown in Figure 1. It is guided by the respective planes; much like a water ripple will propagate radially away from a rain drop hitting a puddle of water. 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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