Simulation of field uniformity in a reverberation chamber

Abstract

As a new and effective testing cite for electromagnetic compatibility test, the reverberation chamber, especially a newly built one, must verifyits field uniformity. So,when undertaking a study on a reverberation chamber, its field uniformity is a key indicator. This article, in accordance with the actual dimension of a reverberation chamber, built an FEKO model, and calculated the electric field of the 8 vertices of the workspace, then verified the field uniformity of this reverberation chamber meet the IEC 61000-4-21 standard.

Characterization of Reverberation Chamber - A Comprehensive Review

“…Moglie et al [30], [31] wave representation using their own developed FDTD code for the study of Anderson darling (AD) rejection frequencies and determination of new location of working volume in the stirrer rotating volume. Another small-size RC modeling analysis for a fixed frequency using dipole antenna as excitation source is reported in [32]. Aizan et al [34] investigated the impact of three different stirrers (flat panel, irregular Z-folded, and asymmetrical irregular folded) designs on the field uniformity of a medium-sized RC with a monopole antenna as an excitation source.…”

“…The analysis of reviewed designs in Table 2 shows that frequency domain MOM approach is the preferred choice for the full-wave EM analysis of an RC [26]- [28], [32], [35], [37]. The hybridization of the MOM with physical optics (PO), geometrical optics (GO), uniform theory of diffraction (UTD), and multilevel fast multipole method (MLFMM) techniques in FEKO offers a comprehensive reduction in the simulation time of a large size RC cavity [26]- [28], [32], [35], [37]. Despite the RC structure, simulation time highly depends on the used metallic material for the modeling of RC walls, tuner, and antenna structures [26], [34], [35], [37].…”

Design, analysis, and validation of Radio Research Agency reverberation chamber

“…3,7 Roughly, LUF occurs at a frequency slightly above three times the first chamber modal resonance. 3,13 LUF can also be expressed as (a) frequency at which at least 60-100 modes inside the cavity exist; (b) frequency at which at least 1.5 mode/MHz (modal density) inside the cavity are present. 3,13,21 These typical limits are formed to ensure that there are a sufficient number of modes in RC to meet the essential operational requirements of statistically uniform and homogenous fields.…”

“…The former approach is based on the theoretical cavity modal density calculations, and it is used for the rough approximation of the LUF. [12][13][14] The determined LUF using modal density approach is not accurate as it did not incorporate the actual behavior and uncertainty of the cavity in calculations. The latter approach of an actual cavity EM field characterization is most commonly used for the more accurate RC chamber validation.…”

“…The LUF of the chamber can be computed using modal density formulas 3,11 or through the field uniformity analysis of RC internal generated EM fields. The former approach is based on the theoretical cavity modal density calculations, and it is used for the rough approximation of the LUF 12‐14 . The determined LUF using modal density approach is not accurate as it did not incorporate the actual behavior and uncertainty of the cavity in calculations.…”