Numerical investigations on the quasi-stationary response of antennas to wideband LFMCW excitation

In this contribution, we numerically investigate if the quasi-stationary (QS) response is a valid approximation for the response of antennas excited by wideband linear-frequency modulated continuous waveforms. We give results for two idealized example systems, showing how the validity of the QS response is dependent on the system´s resonant behavior. It will be shown that the error between exact output and QS response is approximately linearly dependent on the sweep-rate of the linear-frequency modulated excitation. We then conduct our simulations for a realistic wideband radar system operating from 5 GHz to 8 GHz and using impulse responses extracted from electromagnetic simulations of a dipole and a biconical antenna.