Validation of a Method for Predicting Anechoic Chamber Performance

Author: Vince Rodriguez
Publication: IEEE Antennas & Propagation Magazine, August 2018
Copyright Owner: IEEE

Indoor antenna ranges must have the walls, floor, and ceiling treated with a radio-frequency (RF) absorber. The normal incidence performance of the absorber is usually provided by the manufacturer of the material—but the bistatic or offangle performance must also be known. Recently, a polynomial approximation was introduced to predict the reflected energy from a pyramidal absorber.

In this article, these approximations were used to forecast the quiet zone (QZ) performance of several anechoic chambers. The predictions were compared with full-wave analyses performed in CST Suite. In addition to the comparison of the predictions with analyses that use a different numerical method, comparisons were made against actual measurements of the QZ effectiveness of anechoic chambers. Measurements taken per the free-space voltage standing wave ratio (VSWR) method were compared with the estimates that use the polynomials presented in [1]. The results show that the polynomial approximations can be used to give a fairly accurate indication of the QZ performance of anechoic chambers.

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