Simulation and Design of Anechoic Chamber Based on Image Ray-Tracing Method

In order to improve the design capability of absorber engineering of chamber, this paper applied image ray-tracing method to simulate and design a 10-meter anechoic chamber. By means of assigning absorber reasonably and considering the influence of first and second reflections on the quiet zone, the reflectivity level, normal site attenuation(NSA) and field uniformity(FU) were calculated in different types of polarization. Results show that in both vertical and horizontal polarization, the deviation of site VSWR between simulation and test is less than 2.3 dB, the error of NSA is less than 3 dB, and the error of FU is less than 2 dB. Simulation coincides with measurement results well, and all parameters meet requirements of anechoic chamber, verifying that the layout of absorber was reasonable and this algorithm was reliable. The proposed method can apply to estimate quiet zone performance, optimize the arrangement of absorber, thus shorten design period effectively.