Antenna Calibration with Improved Accuracy in a Semi-Anechoic Chamber

A method to improve the quality of antenna calibration in a semi-anechoic chamber is discussed, which is based on a compensation of unwanted reflections at chamber walls with the help of destructive interference. To this end, several measurements are carried out and averaged in a favorable way. This method significantly increases the accuracy of antenna calibration when employed in connection with the standard site method or the three antenna method. For validation, this method is applied in a standard isotropy test scenario, showing that anisotropies of a non optimal chamber are drastically reduced. Results are presented in terms of the antenna factors for several transmission lines computed via a two antenna variant of the three antenna method.