  Numerical simulation of anechoic chambers is a hot topic since it can provide
useful data about the performance of the EMC site. However, the mathematical
nature of the problem, the physical dimensions of the simulated sites and the
frequency ranges pose nontrivial challenges to the simulation. Computational
requirements in particular will quickly become unmanageable if adequate
techniques are not employed. In this work we describe a novel approach, based
on equivalent elements, that enables the simulation of large chambers with
modest computational resources. The method is then validated against real
measurement results.
