METHOD OF ESTIMATING THE MAXIMUM RADIATED INTERFERENCE FIELD OF ELECTRONIC EQUIPMENT BY USING RANDOMLY ASSIGNED PHASE TERMS

Using the electric field strength measurement value vicinal to electro nic equipment set up in a factory, investigation was made by the exper imental method stipulated by VCCI, that is, by both theory and experim ent, estimating the maximum value of the electric field strength measu red for the set-up of electronic equipment at the test site by the 10- m test method. In the estimation method proposed, the electric field s trength in the vicinity of electronic equipment is measured in cylindr ical form, the phase of the measurement point is assigned by uniform r andom number and, employing the integral expression of electric field using these values, the maximum value of the electric field strength o f the estimation surface is estimated. In the investigation, even in t he case of assigning phase by random numbers, it was found theoretical ly possible to estimate within 6-dB accuracy the maximum value of the electric field strength of the estimation surface. Moreover, as a resu lt of investigating the accuracy of the estimation method using a sphe rical dipole antenna as a radiation interference source, it was confir med experimentally that the deviation between the estimated value and measurement value is roughly below 4 dB over a frequency of 100 MHz to 1 GHz.