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.