Multiple Scattering Model for Beam Synthesis with Reconfigurable Intelligent Surfaces

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This article presents a method of synthetic beamforming for reconfigurable intelligent surfaces (RIS). The method uses a T-matrix based multiple scattering model to compute the scattering from the RIS. We assume that the elements of the RIS are infinite circular cylinders. This allows us to make the model two-dimensional. Furthermore, we assume that the RIS elements satisfy the impedance boundary condition (IBC), the complex parameter of which adjusts the phase shift of the scattered field. We synthesize the beam both analytically and numerically. Both approaches rely on an approximation that assumes RIS elements that are small compared to the wavelength. We demonstrate the efficacy of the beam synthesis by applying it in a test case that features a linear array of RIS elements.
Original languageEnglish
Pages (from-to)4990-5000
Number of pages11
JournalIEEE Transactions on Antennas and Propagation
Issue number6
Early online date3 Apr 2023
Publication statusPublished - 1 Jun 2023
MoE publication typeA1 Journal article-refereed


  • beam steering
  • reconfigurable intelligent surfaces
  • boundary conditions
  • surface impedance


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