EEVblog #1176 - 2 Layer vs 4 Layer PCB EMC TESTED!

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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: !/

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Designing the 4 layer board:

Bypass capacitor Visualised:
PCB Power Plan Capacitance:

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