By attaching antennas to a printed circuit board we can analyze the physics of unwanted radiation
The biconical antenna can be modeled using simple and inexpensive software tools
Jeffrey Davis’ innovative design for a device driver lowers emissions without compromising performance
As a signal trace is moved towards the edges of a return plane, the inductance of the return plane rises
Flux from a signal conductor can loop around a return conductor inducing a voltage along it
A plane wave impinging on a metal shield with an aperture emerges as a point source
The pyramidal absorbers can be modeled as a sandwich of planes with varying resistivity
A map of vector potential from a small wire element
A return plane can develop a voltage along its length causing attached cables to radiate
A slot cut across a solid return plane can cause havoc because of its affect on return inductance
“Lost Flux," --the flux created by the center conductor that leaks around a shield -- causes the shield to radiate
Common mode currents are created when balanced geometries meet unbalanced ones”
Divergence -- the flux flowing into and out of a small volume element -- is a key concept in field theory
A small change in an electric field over distance creates a changing magnetic field at right angles to it
Varying signal and return geometries radiate differently due to varying amounts of "lost flux"