Efficient broadband electromagnetic modeling of anechoic chambers

An efficient method is presented to numerically model anechoic chambers ranging from VHF to microwave frequencies. In this method, an approximate image theory is proposed to improve the accuracy of plane wave assumptions used at lower frequencies. At high frequencies, an efficient image-based ray tracing algorithm is developed which integrates with the approximate image theory seamlessly. Numerical results demonstrate the applications in the analysis of anechoic chambers for both low frequency and high frequency ranges.