Measurement environment influence compensation to reproduce anechoic chamber measurements with near field scanning

Field and cable scan methods can be an alternative for antenna measurements in anechoic chambers. Space, cost efficiency and more accurate information about the system under test are the most important benefits. Using scan methods source distribution can be obtained and simulation models can be built. To find the relation between a field scan based radiation model, giving the electromagnetic field at any location, and an anechoic chamber measurement the differences between model and real environment must be considered. When first a current distribution is reconstructed from a near field distribution the electromagnetic far field of the measured equipment can be calculated only assuming simplified conditions. An antenna measurement is done in an anechoic chamber environment. Residual wall reflections, antenna interaction, edge currents of the metallic table or interfering measurement equipment cables influence the antenna voltage. In this paper an approach for finding the field measurement results of an anechoic chamber using near field scans is shown. The method applies a measured correction or transfer function.