Characterization and modelling of electrically small systems to predict EMC performance in different environments

The use of numerical modelling tools to simulate the behaviour of practical electronic equipment is only usually possible if simplifications are made to the system. Often this results in the modelling of stylized equipment, which is not desirable. A promising method to overcome this is to determine, through measurements, the fundamental radiation parameters of such systems and use these parameters directly in the modelling method. The present paper describes such an approach. An electrically small test device is decomposed into its equivalent electric and magnetic dipoles which are then used in simulations. The simulation method used is transmission-line modelling (TLM) and the equivalent dipole representation of the equipment, and subsequent modelling, is validated against experimental results with a close agreement between the two