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A 3D-Printed Bi-Material Bragg-Based Reflectarray Antenna.

Walid Chekkar1, Jerome Lanteri1, Tom Malvaux2

  • 1Laboratory of Electronics, Antennas and Telecommunications (LEAT), CNRS, Université Côte d'Azur, Sophia Antipolis, 06903 Valbonne, France.

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|October 26, 2024
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Summary
This summary is machine-generated.

This study introduces a 3D-printed dielectric reflectarray with bandgap properties for multi-band use. The novel design, utilizing a 1D Bragg reflector, achieves significant gain and high transparency, proving effective for diverse frequency applications.

Keywords:
3D-printingBragg mirrordual-bandmillimeter wavephotonic-bandgapreflectarray

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Area of Science:

  • Electromagnetics and Metamaterials
  • Additive Manufacturing
  • Antenna Engineering

Background:

  • Reflectarrays offer a low-profile alternative to parabolic dishes for beamforming.
  • Achieving multi-band operation and desired bandgap characteristics in reflectarrays remains a challenge.
  • Dielectric reflectarrays are attractive for reduced losses compared to metallic counterparts.

Purpose of the Study:

  • To present a novel 3D-printed fully dielectric bi-material reflectarray.
  • To incorporate bandgap characteristics for multi-band applications using a 1D Bragg reflector unit cell.
  • To validate the performance of the proposed reflectarray through fabrication and measurement.

Main Methods:

  • Design of a 1D Bragg reflector unit cell with a spatially varying refractive index.
  • 3D printing of a bi-material reflectarray with specific dimensions (121.5 mm × 121.5 mm) and f/D ratio of 0.5.
  • Measurement of reflection gain, aperture efficiency, and transmission coefficient.

Main Results:

  • The fabricated reflectarray demonstrated a measured gain of 27.22 dBi at 27 GHz, with an aperture efficiency of 35.05%.
  • Simulated and measured performances showed good agreement within the 26-30 GHz frequency range.
  • High transparency was confirmed, with a transmission coefficient of 0.32 dB at 39 GHz.

Conclusions:

  • The proposed 3D-printed dielectric reflectarray effectively utilizes a 1D Bragg reflector for bandgap control.
  • The design is suitable for multi-band frequency applications due to its tunable bandgap characteristics.
  • The achieved gain, efficiency, and transparency highlight the potential of this technology for advanced RF systems.