Modeling and Prediction of Low-Frequency Near-Field Radiation for a Power Converter Based on the Operating Principle of a Monopole Antenna

This article develops a model to predict the measured near-field radiation via a monopole antenna based on the test setups specified by the EMI standards such as CISPR 25, DO-160E, MIL-STD-461E. The article first identified a major near-field radiation source in a dc–dc power converter. The operation principle of the monopole antenna is then studied, and a model is developed to predict the output voltage of the antenna. Next, the transmission line effect in the EMI test setup is identified and its impact on the measured radiated EMI is modeled. A prediction technique is developed for the low-frequency near-field radiation. Finally, experiments validated the developed theory.