Journal: IEEE Open Journal of the Communications Society

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IEEE

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2644-125X

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Publications 1 - 2 of 2
  • Efficient and Physically Consistent Modeling of Reconfigurable Electromagnetic Structures
    Item type: Journal Article
    Stutz-Tirri, Alexander; Schwan, Georg; Studer, Christoph (2025)
    IEEE Open Journal of the Communications Society
    Reconfigurable electromagnetic structures (REMSs), such as reconfigurable reflectarrays (RRAs) or reconfigurable intelligent surfaces (RISs), hold significant potential to improve the spectral efficiency of wireless communication systems and the accuracy of wireless sensing systems. Even though several REMS modeling approaches have been proposed in recent years, the literature lacks models that are both computationally efficient and physically consistent. As a result, algorithms that control the reconfigurable elements of REMSs (e.g., the phase shifts of a RIS) are often built on simplistic and thus inaccurate models. To enable physically accurate REMS-parameter tuning, we present a new framework for efficient and physically consistent modeling of general REMSs. Our modeling method combines a circuit-theoretic approach with a new formalism that describes a REMS's interaction with the electromagnetic (EM) waves in its far-field region. Our modeling method enables efficient computation of the entire far-field radiation pattern for arbitrary configurations of the REMS reconfigurable elements once a single full-wave EM simulation of the non-reconfigurable parts of the REMS has been performed. The predictions made by our framework align with the physical laws of classical electrodynamics and model effects caused by inter-antenna coupling, non-reciprocal materials, polarization, ohmic losses, matching losses, influence of metallic housings, noise from low-noise amplifiers, and noise arising in or received by antennas. In order to validate the efficiency and accuracy of our modeling approach, we (i) compare our modeling method to EM simulations and (ii) conduct a case study involving an RRA that enables simultaneous multiuser beam- and null-forming using a new, computationally efficient, and physically accurate parameter tuning algorithm.
  • Erratum to “Efficient and Physically Consistent Modeling of Reconfigurable Electromagnetic Structures”
    Item type: Other Journal Item
    Stutz-Tirri, Alexander; Schwan, Georg; Studer, Christoph (2025)
    IEEE Open Journal of the Communications Society
    With this correction note, the authors would like to point out several errors in [1] that have been intro- duced by the IEEE during the editing process. Specifically, the left-hand side of equations (32)–(37), as well as the left-hand side of equation (75) were published incorrectly. In addition, the authors would like to point out an error of their own: on page 1616, when the free-space wavenumber is introduced, we mistakenly omitted the factor 2π. To remain consistent with the rest of the paper, the correct expression for the free-space wavenumber is given by k $\widehat{=}$ 2πf $\sqrt{μ_0ϵ_0}$.
Publications 1 - 2 of 2