EMI and Digital Devices

By attaching telescoping rod antennas to a printed circuit board we can analyze the physics of unwanted radiation. We show a clock driver attached to a distant load. Flux radiating from the wire running between the two envelopes the printed circuit board. That enveloping flux creates a voltage across the ground plane causing the attached telescoping rod antennas to radiate. The same phenomenon is a principal cause of radiation from digital devices at frequencies below a few hundred MHz. From “EMI: Rethinking the Role of Power and Return Planes.”

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