Measurement of scaled complex enclosures for EMI applications

It is a challenge to measure electromagnetic wave interference (EMI) and compatibility (EMC) issues in complex structures that are electrically large. We have built a scaled test facility by reducing the size of the enclosures by a factor of s, increased the frequency of measurement by a factor of s, and increased the conductivity of the walls of the enclosure also by a factor of s. This results in an invariance of Maxwell's equations. The facility allows us to conveniently test the scaled equivalent of complex interconnected enclosure networks and other large structures. We report on results of a cryogenically cooled scaled enclosure and illustrate its properties as a function of temperature.