Spatially Selective Reconfigurable Intelligent Surfaces Through Element Permutation
Abstract
A standard reconfigurable intelligent surface (RIS) can be configured to reflect signals from an arbitrary impinging direction to an arbitrary outgoing direction. However, if a signal impinges from any other direction, said signal is reflected, with full beamforming gain, to a specific direction, which is easily determined. The goal of this paper is to propose a RIS which \emph{only} reflects signals from the configured impinging direction. This can be accomplished by a RIS architecture that permutes the antenna elements in the sense that a signal is re-radiated from a different antenna than the one receiving the signal. We analytically prove this fact, and also discuss several variants and hardware implementations.
- Publication:
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arXiv e-prints
- Pub Date:
- March 2024
- DOI:
- 10.48550/arXiv.2403.03629
- arXiv:
- arXiv:2403.03629
- Bibcode:
- 2024arXiv240303629R
- Keywords:
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- Electrical Engineering and Systems Science - Signal Processing
- E-Print:
- ICC 2024, 6 pages, 4 figures