Relating to the radiated emission sources finding method based on CISPR emission measurement system, which uses only amplitude data without phase data, the applicability to horizontally polarized sources was studied. We experimentally verified by using two spherical dipole antennas as ideal emission sources in the frequency range from 300 MHz to 1GHz. As the results, the position estimation deviation Δd was less than 0.09 m, the amplitude estimation deviation Δj was less than 1.5 dB, in which position estimation accuracy was raised so much compared with that for vertically polarized sources, and additionally the angle of its horizontal current direction could be estimated. Furthermore, it was revealed that this method can be also applied even when several sources exist, consequently the applicability of this method has been greatly expanded.

The possibility of applying a recently proposed emission source location method, which is based on CISPR measurements, to sources with arbitrary directional current components is studied. We propose a new finding algorithm in which the horizontal and the vertical current components are estimated at the same time by taking into account the contribution of horizontal current components when calculating the vertical electric field. As a result of experimental verification by using two spherical dipole antennas as ideal emission sources, estimated values show good agreement with the original ones in the frequency range from 300 MHz to 1 GHz, where the position estimation deviation d was less than 0.15 m, the amplitude estimation deviation j was less than 2.1 dB, and furthermore the angle of current direction could be estimated. Consequently, this method with the presented new algorithm can be applied to find radiated emission sources even when the current components point to arbitrary directions.