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Anechoic chambers which are used for emission and immunity testing require expensive ferrite tiles on their inner surfaces. This paper describes a method to reduce the number of required ferrite tiles, whilst ensuring a reliable and specifled test region. In this method, the positions of some ferrite tiles are found optimally to keep the performance of the anechoic chamber as high as possible. An optimum ray-tracing method is presented to predict the electric fleld in the anechoic chamber. The performance of the proposed method is verifled by a comprehensive example simulated by the CST software, which is a full-wave simulator based on time difierence method.

MINIMUM USAGE OF FERRITE TILES IN ANECHOIC CHAMBERS