All-angle Scanning Perfect Anomalous Reflection by Using Passive Aperiodic Gratings

Yongming Li, Xikui Ma, Xuchen Wang*, Grigorii Ptitcyn, Mostafa Movahediqomi, Sergei Tretyakov

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
128 Downloads (Pure)

Abstract

Realizing continuous sweeping of perfect anomalous reflection in a wide angular range has become a technical challenge. This challenge cannot be overcome by the conventional aperiodic reflectarrays and periodic metasurfaces or metagratings. In this paper, we investigate means to create scanning reflectarrays for the reflection of plane waves coming from any direction into any other direction without any parasitic scattering. The reflection angle can be continuously adjusted by proper tuning of reactive loads of each array element, while the geometrical period is kept constant. We conceptually study simple canonical two-dimensional arrays formed by impedance strips above a perfectly reflecting plane. This setup allows fully analytical solutions, which we exploit for understanding the physical nature of parasitic scattering and finding means to overcome fundamental limitations of conventional reflectarray antennas. We propose to use subwavelength-spaced arrays and optimize current distribution in λ/2-sized supercells. As a result, we demonstrate perfect tunable reflection to any angle. Our work provides an effective approach to designing reconfigurable intelligent surfaces with electrically tunable reflection angles.
Original languageEnglish
Article number10313252
JournalIEEE Transactions on Antennas and Propagation
DOIs
Publication statusE-pub ahead of print - 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • Reflection
  • Impedance
  • Metasurfaces
  • Phased arrays
  • Strips
  • Scattering
  • Optimization

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