What difference does a 4 layer PCB make to EMC radiated emissions compared to an identical 2 layer PCB? And why?
Dave does H-Field near-field probe testing on two otherwise identical PCB's.
Electromagnetic waves and the difference between near field and far field, and H-Field and E-field probes and wave impedance is also explained.
The PCB layout is then examined to look at loop area and by-passing and what effect this has.
Forum: http://www.eevblog.com/forum/blog/eevblog-1176-2-layer-vs-4-layer-pcb-emc-tested!/
https://gigatron.io/
Designing the 4 layer board: https://www.youtube.com/watch?v=Ep4r-wD7PPs
Bypass capacitor Visualised: https://www.youtube.com/watch?v=1xicZF9glH0
PCB Power Plan Capacitance: https://www.youtube.com/watch?v=CBD9vwKcvtY
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