Modeling the Time-Harmonic Electromagnetic Emissions of Microwave Circuits

This paper presents a simple and practical method to reproduce and predict the time-domain behavior of the radiated electromagnetic fields of microwave circuits. The previously developed frequency-domain model is extended toward predicting the large-band electromagnetic radiations and thereby the time-harmonic fields. Fourier-series-based method is used in order to transform the frequency-domain near-field measurement data into time domain for digital applications. A cutting-edge extraction procedure is developed so as to extract the large-band model parameters in a single step. The modeling method is validated on a high frequency transmission line and on a hybrid coupler. The modeled results are compared with time-domain simulations performed in CST Microwave Studio.