EMC Design Practices: The Illusive RF Radiated Coupling Loop: Part 2 in a Series

摘要

Let' s hear it for the lowly wire. That mysterious device that can be a conductor, a resistor, a capacitor plate, an inductor, and an antenna all packaged in one exciting component. Soft and flexible, thick or thin, narrow or wide, rigid and stiff, a great conductor—or maybe not. All these terms describe a component with really unique properties that is largely ignored by electronics designers. Most of the time, wire routing creates loops that provide paths for signal currents to move from a source to a load and return back to the source. Loops appear in ICs where they interconnect millions of transistors, on PCBs and backplanes where the trace loops are larger but fewer, and in cables where loop areas can be extremely large.