Whitepaper
Efficient Broadband Electromagnetic Modeling of Anechoic Chambers
This white paper discusses electromagnetic modeling of anechoic chambers used in EMC testing. It highlights that while full wave solvers such as FEM, FDTD, MoM, and MLFMM can accurately solve Maxwell's equations, they often face practical limitations due to high memory and time requirements for larger chambers and higher frequencies. Therefore, the white paper emphasizes the use of ray tracing methods, which are more efficient. The ray tracing method involves modeling electromagnetic field reflection correctly by using a general approach that accounts for polarization and decomposes fields into components parallel and perpendicular to the plane of incidence. This method is noted for its efficiency while offering better accuracy at lower frequencies compared to traditional decomposition techniques when near-field effects are significant. The white paper also presents numerical examples demonstrating NSA prediction and free-space VSWR reflectivity analysis using this approach.