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Gradient Index Metasurface Lens for Microwave Imaging.

Srijan Datta1, Antonello Tamburrino2, Lalita Udpa1

  • 1Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824, USA.

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|November 11, 2022
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Summary
This summary is machine-generated.

This study demonstrates a novel gradient-index (GRIN) metasurface lens for microwave imaging. The thin, 8 GHz lens effectively focuses waves, enabling microwave nondestructive evaluation (NDE) applications.

Keywords:
focusinglensesmetamaterialsmicrowave imagingnondestructive testing

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Area of Science:

  • Electromagnetics and Metamaterials
  • Microwave Engineering
  • Applied Physics

Background:

  • Metasurfaces offer unique electromagnetic properties not found in nature.
  • Gradient-index (GRIN) lenses provide precise control over wave propagation.
  • Microwave imaging requires efficient and compact lens designs.

Purpose of the Study:

  • To design, simulate, and experimentally validate an 8 GHz GRIN metasurface lens.
  • To explore the application of GRIN metasurfaces in microwave imaging.
  • To develop a thin and effective lens for potential microwave nondestructive evaluation (NDE).

Main Methods:

  • Unit cell design using electric-LC (ELC) resonators with tunable capacitive gaps.
  • Full-wave finite element (FEM) method for metasurface lens simulation and analysis.
  • Experimental fabrication and characterization of 1D and 2D GRIN lenses.
  • Focusing performance evaluation using horn antennas and plane waves.

Main Results:

  • Successful design and validation of a 2D GRIN metasurface lens with a compact size (119 mm x 119 mm aperture, 0.6 mm thickness).
  • Demonstrated agreement between simulated and experimental field distributions.
  • Achieved effective focusing of 8 GHz plane waves.
  • Successfully imaged a machined groove in a Teflon sample using the 2D lens prototype for NDE.

Conclusions:

  • GRIN metasurface lenses are a viable technology for microwave imaging applications.
  • The proposed ELC resonator unit cell enables effective control of the refractive index for GRIN lens design.
  • The developed lens shows promise for compact and high-performance microwave NDE systems.