return current

This is the second article of a two-article series devoted to the return current distribution in a PCB microstrip line configuration.

This is the first article of a two-article series devoted to the return current distribution in a 2-layer FR-4 PCB microstrip line configuration with a solid reference plane.

At low frequencies, current takes the shortest path home. At high frequencies, it abandons direct routes for minimal inductance paths beneath traces. Ground plane discontinuities create radiation havoc—measurements prove theory right.