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    Acoustic backscatter communication in metal structures
    (2024)
    Oppermann, Peter
    ;
    Renner, Bernd-Christian
    This dissertation investigates batteryless sensor nodes embedded in metal structures, focusing on acoustic backscatter, active communication, and wireless power transfer. In particular, it analyzes the nonlinear through-metal channel, derives channel models, and proposes in situ channel estimation techniques. Several methods are demonstrated to increase data rates despite reverberation and to improve power-transfer efficiency. In addition to simulation, custom prototypes are designed to verify the method's practical applicability.
    Publicationtype: Doctoral Thesis
      129  260
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    Simulation of traveling-wave tubes for analysis and optimization in modulated back-off
    (2020)
    Safi, Djamschid
    ;
    Jacob, Arne
    In this work, modeling approaches for the simulation of traveling-wave tubes in modulated operation are developed and characterized regarding their computational effort, their practicability, and the accuracy of the results. The impact of the nonlinearities on typical communication characteristics is evaluated, with the purpose of enhancing the understanding of the relationship between classical and effective modulated characteristics. Based on the gathered insights, an automated optimization routine is proposed, including modulated operation to improve the traveling-wave tube's behavior in modulated back-off.
    Publicationtype: Doctoral Thesis
      382  2789
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    Electromagnetic modeling and optimization of through silicon vias
    (Shaker Verlag, 2018)
    Dahl, David
    ;
    Schuster, Christian
    This thesis presents the simulation and the design of vertical interconnects in silicon substrates known as through silicon vias (TSVs) which are applied as a component of 3D integration of integrated circuits. Numerical methods of comparably high efficiency are developed and applied in order to simulate the electromagnetic properties of large realistic arrays of TSVs. The proposed methods are correlated with alternative methods and parameter variations are carried out to derive design guidelines. Further, several test structures with TSVs are developed and the measurement results are correlated with the results from electromagnetic simulations.
    Publicationtype: Doctoral Thesis
      454  1990
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    Item type:Publication, Access status: without files ,
      35