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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