Electromagnetic Radiation Mechanism Analysis and Field Strength Prediction of an Elementary Digital Inverter with Cables

In this paper, common mode (CM) and differential (DM) far-field radiation models of a typical digital inverter with cables are built up to predict electromagnetic field strength analyze characteristics. The CM current model its analyses based on the imbalance difference method. It is found out that voltage between drain source electrodes upper transistor key equivalent interference (EMI). Far-field in free space predicted by using asymmetrical antenna method loop accuracy these methods verified CST simulation results frequency range from 1 MHz 400 MHz. Furthermore, improved mirror method, which enables include reflection effect metal ground plane at compatibility (EMC) test site. Both measurements semi-anechoic chamber confirm proposed prediction