FDTD Simulations of Random Boundaries

This study investigates the performance of a reverberation chamber under random boundary conditions with a uniform field distribution to take into account the irregularities of the wall, in particular at high frequencies such as the millimeter band. Wall irregularities cause a more random field inside the chamber than a perfect electric conductor. An FDTD code is optimized to simulate random boundaries based reverberation chamber with a stirrer. The number of uncorrelated positions are evaluated by using the mode stirrer to characterize random boundaries, thus bringing a more chaotic behavior inside the chamber. The Kolmogorov-Smirnov statistical analysis further exhibits that the chamber's field distribution aligns well with theoretical expectations. Results point out the suitability of a reverberation chamber for electromagnetic compatibility tests and wireless device characterization in the millimeter band, where the walls are not ideal. These findings reinforce the effectiveness of reverberation chambers in controlled electromagnetic environments.