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Active impedance metasurface with full 360° reflection phase tuning.

Bo O Zhu1, Junming Zhao, Yijun Feng

  • 1School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.

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This study introduces an active impedance metasurface enabling full 360° reflection phase control, overcoming limitations of conventional tunable metasurfaces for advanced applications.

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Area of Science:

  • Electromagnetics and Metamaterials
  • Applied Physics
  • Antenna Engineering

Background:

  • Metasurfaces offer tunable reflection phase via active elements, but typically have limited tuning ranges.
  • Conventional impedance metasurfaces use electrical small scatters for designed reflection phases.

Purpose of the Study:

  • To present an active impedance metasurface with full 360° reflection phase control.
  • To address the phase tuning deficiencies in conventional metasurface designs.

Main Methods:

  • Designed a unit cell featuring a multiple resonance structure with two resonance poles and one resonance zero.
  • Utilized theoretical analysis, simulation, and experimental validation at microwave frequencies.

Main Results:

  • Achieved a full 360° reflection phase variation and active tuning within a finite frequency band.
  • Demonstrated linear reflection phase tuning capabilities.
  • Validated the proposed approach through experimental results.

Conclusions:

  • The developed active impedance metasurface overcomes phase tuning limitations of conventional designs.
  • The technology enables fine and full phase tuning for applications like beam steering in reflectarray antennas.