Field uniformity improvement at lower frequencies in a reverberation chamber using metasurfaces

Abstract

The field uniformity in most reverberation chambers (RC) generally cannot meet the standards of IEC61000-4-21 in the frequency range between 80 MHz and 200 MHz, which is lower than the lowest usable frequency (LUF) of the RCs. In this paper, we demonstrate that by coating the RCs walls with judiciously designed metasurfaces the field uniformity in the RCs between 80 MHz and 200 MHz can be effectively improved. Actually, the reflective metasurfaces can be designed to tune the phase of scattering waves from the walls and increase the mode numbers in the RCs, thus improving the field uniformity and generating statistically homogeneous, isotropic, incoherent and random fields. Simulation results validate our idea.