How Electromagnetic Fields are propagated and coupled together.
Conductive coupling is usually low frequency noise traveling along a pair of wires due to a common resistive path, which form a loop. Breaking the connection stops the interference (“ground loops”).
Radiated coupling represent EM waves propagating through space from one point to another, whose coupling factor reduces by a factor of 1/r.
Inductive and Capacitive couplig refers to near field effects, which are reduced rapidly with separation (near field terms of 1/r^2 and 1/r^3).
Inductive coupling requires two "loops" coupled together, with the field of the one inducing noise into the other (think transformer).
Example: one cable inducing noise into an adjacent cable.
Inductive coupling is a high di/dt phenomenon.
Capacitive coupling requires two “plates” with the noisy plate inducing a voltage change in the other due to dispersion effects (think capacitor).
Example: heat sink from a switched mode power supply inducing voltage changes in a nearby cable or chassis.
Capacitive coupling is generally a high dv/dt phenomenon.