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Eliminating Ground Reliance in Reflective Metasurfaces for Anomalous Reflections.

Mina Feizi1, Shu-Lin Chen1, Doruk G Baran1

  • 1Global Big Data Technologies Centre, University of Technology Sydney, 2007 Sydney, NSW, Australia.

ACS Applied Materials & Interfaces
|July 1, 2025
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Summary
This summary is machine-generated.

Researchers developed novel reflective metasurfaces (RMs) without metallic ground planes, enabling efficient beam reflection and overcoming limitations of traditional designs. These RMs function as "wave benders," achieving high directivity and wide bandwidth operation.

Keywords:
anomalous reflectionsapplied metasurfaceendfire beamgroundless reflectionopen-edge loopreflective metasurface

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Area of Science:

  • Optics and Electromagnetism
  • Metasurface Technology

Background:

  • Reflective metasurfaces (RMs) are crucial for redirecting signals and overcoming line-of-sight (LoS) blockages.
  • Conventional RMs require metallic ground planes, limiting their angle range and increasing dielectric losses.

Purpose of the Study:

  • To develop a novel RM design that eliminates the need for a metallic ground plane.
  • To demonstrate high-performance beam reflection with improved directivity and wider operating bandwidth.

Main Methods:

  • Introduced an open-edge loop structure as the unit cell for the metasurface.
  • Investigated three distinct open-edge loop-based RMs under varying incidence and reflection angles.
  • Utilized experimental verification to confirm simulated beam reflection characteristics.

Main Results:

  • Developed RMs function as 'wave benders,' transforming incident waves into endfire reflected beams (90°).
  • Achieved a directivity improvement of approximately 5 dBi compared to ground-based designs.
  • Experimental results confirmed beam reflection across a wide bandwidth (26–33 GHz).

Conclusions:

  • This work presents the first high-performance reflective metasurface design independent of a metallic ground plane.
  • The novel open-edge loop structure offers a promising alternative for advanced beam manipulation applications.