TECHNIQUES OF ESTIMATING RADIATED INTERFERENCE FIELD IN ACTUAL CONFIGURATIONS

To resolve the problem of electromagnetic interference generated at th e actual configuration of electronic equipment by a radiated interfere nce wave, it is desirable to establish a technique to estimate the rad iated interference of electronic equipment. This paper discusses a met hod for estimating the radiated interference in actual configuration f rom the measured radiated interference at the test site of the electro nic equipment. In the proposed estimation method, a simulated source o f the electronic equipment is used for deriving the deviation (convers ion coefficient) of the wave propagation characteristics of the test s ite and the actual configuration. By means of this conversion coeffici ent, the radiated interference in actual configuration is estimated fr om the radiated interference at the test site, An estimation method is shown in the case where a spherical dipole antenna is used as a simul ation source of the electronic equipment. When the effectiveness of th e estimation method was verified experimentally with actual electronic equipment, it was found that the radiated interference in the actual configuration can be estimated with accuracy of 4 to 5 dB at the frequ encies of 30 to 300 MHz.