Time domain refers to the analysis of mathematical functions (of in our case electromagnetic signals or waves) with respect to time. This is the area of modelling of EM waves concerned with their changeable function(s) over time. In contrast the Frequency domain method is concerned with the functions and their relationship with the frequency of the signal. Both are mathematical tools used in modelling to come up with new performance characteristics and hence new designs for electrical systems and devices.
Rodolfo Araneo is a full professor with the Department of Electrical Engineering at the University of Rome "La Sapienza", Rome, Italy. He became a full professor at this University in 2021. In 2018, he was elevated to the rank of "Fellow Member" of The Applied Computational Electromagnetics Society (ACES). He is author of more than 200 papers and of two books.