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    Item type:Publication, Access status: without files ,
    Determination of the radar channel transfer matrix in the near field of electrically large targets based on physical optics principles
    (IEEE, 2026-05)
    Tegowski, Bartosz
    ;
    Langer, Dominik
    ;
    Albrecht, Nils C.
    ;
    Koelpin, Alexander
    This 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.
    Publicationtype: Conference Paper
      29
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    Item type:Publication, Access status: without files ,
    A novel concept for a wake-up receiver for LoRa communication with improved selectivity
    (IEEE, 2026-05)
    Riege, Philip C.
    ;
    Tegowski, Bartosz
    ;
    Albrecht, Nils C.
    ;
    Koelpin, Alexander
    This work presents a novel approach for the implementation of a wake-up receiver for LoRa communication. It is designed to exploit the LoRa modulation based on chirp spread spectrum and is inherently less susceptible to false wakeups caused by interfering signals. The theory of the concept is presented indicating key parameters. For validation, a proof-ofconcept implementation is developed with exemplary measurement results.
    Publicationtype: Conference Paper
      34