| Citation: | LYU Dongxiang, SU Donglin. Influence of EUT radiated emission testing location on test results[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(1): 100-106. doi: 10.13700/j.bh.1001-5965.2016.0121(in Chinese)
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In order to improve the measurement precision and reduce the influence of equipment under test (EUT) electromagnetic radiated emission testing location on test results in electromagnetic capatibility (EMC) semi-anechoic chamber, this paper studies the influence law on electromagnetic signal radiation emission testing of semi-anechoic chamber typical resonance frequency for different testing locations of semi-anechoic chamber. The research is modeled, simulated and calculated by geometrical optics, consistency of diffraction theory and multipath effect algorithm. The math model and computational formulas are proposed, besides, the influence of direct field is eliminated in the math model. The electromagnetic propagation effects of reflection, refraction and multipath effect in the testing are comprehensively considered. The calculation results of math propagation model and actual testing model that eliminate the influence of direct field are compared. The results verify the effectiveness of math model. This research supplies theory basis for correcting the results of electromagnetic radiation emission testing in different positions of semi-anechoic chamber, which is also helpful to improving the measurement precision of electromagnetic radiation emission testing in semi-anechoic chamber.
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