Tegowski, BartoszBartoszTegowskiLanger, DominikDominikLangerAlbrecht, Nils C.Nils C.AlbrechtKoelpin, AlexanderAlexanderKoelpin2026-07-242026-07-242026-0526th International Microwave and Radar Conference, MIKON 2026https://hdl.handle.net/11420/64051This contribution deals with the determination of the radar channel transfer matrix in short-range radar applications. In these, the radar antennas are often located in the near field of an electrically large target, in which the scattering properties, in contrast to far-field relationships, depend on distance as well as the antenna. Based on physical optics and the antenna radiation pattern, a bistatic complex-valued transfer function between the feed of a transmit antenna and the output port of a receive antenna is derived. For multiple antennas, it extends to a channel matrix, which allows to predict the radar response of multiple-input multiple-output (MIMO) systems as well as antenna arrays. Measurements of the channel matrix in the case of a disk target conducted with horn and open-ended waveguide antennas at 24 GHz prove the validity of the proposed approach. It accurately predicts near-field effects such as power level fading and nonlinear phase distortion for MIMO radar configurations.enArraysbistatic scatteringchannel modelingmultiple-input multiple-output (MIMO)multistaticnear-field effectsphysical opticsradarradar cross section (RCS)wave propagationTechnology::621: Applied Physics::621.3: Electrical Engineering, Electronic Engineering::621.38: Electronics, Communications EngineeringTechnology::621: Applied Physics::621.3: Electrical Engineering, Electronic EngineeringConference Paper10.23919/MIKON66970.2026.11577874