Improvement of accuracy using majority decision for far field estimation by source modelling method

The method of source modelling have been studied to estimate radiated emission at a distance of 10 m from the measured data at a distance of 3 m because the measurement facilities used the measurement at a distance of 10 m is expensive. However, the deviation between the measured and estimated values was more than 15 dB under a certain condition. In this paper, we study the method of improving estimation accuracy. The investigation indicated that the probability obtaining the optimum solution was majority. Therefore, to improve the estimation accuracy, we exclude the data that does not contain the range of standard deviation. The simulation using the calculated electric field was carried out. The imitated equipment was used as emission source, and the bilog-antenna was used as receiving antenna. The results indicated that the maximum deviation was reduced from 18 dB to 5dB. The radiated emission from a PC was estimated to verify the proposed estimation method. The result indicated the deviation was reduced from 4 dB to 3 dB.