Ok, these are ways coupling can occur. Might have gone too deep but I’m putting it here then moving back up to insulating layers “The basic arrangement of noise source, coupling path and victim, receptor or sink is shown in the figure below. Source and victim are usually electronic hardware devices, though the source may be a natural phenomenon such as a lightning strike, electrostatic discharge (ESD) or, in one famous case, the Big Bang at the origin of the Universe. The four electromagnetic interference (EMI) coupling modes. There are four basic coupling mechanisms: conductive, capacitive, magnetic or inductive, and radiative. Any coupling path can be broken down into one or more of these coupling mechanisms working together. For example the lower path in the diagram involves inductive, conductive and capacitive modes.” https://en.wikipedia.org/wiki/Electromagnetic_compatibility

Ok, these are ways coupling can occur. Might have gone too deep but I’m putting it here then moving back up to insulating layers
 
“The basic arrangement of noise source, coupling path and victim, receptor or sink is shown in the figure below. Source and victim are usually electronic hardware devices, though the source may be a natural phenomenon such as a lightning strike, electrostatic discharge (ESD) or, in one famous case, the Big Bang at the origin of the Universe.
 
The four electromagnetic interference (EMI) coupling modes.
There are four basic coupling mechanisms: conductive, capacitive, magnetic or inductive, and radiative. Any coupling path can be broken down into one or more of these coupling mechanisms working together. For example the lower path in the diagram involves inductive, conductive and capacitive modes.”
https://en.wikipedia.org/wiki/Electromagnetic_compatibility

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