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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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An ultra-wideband thin metamaterial linear cross-polarization conversion.

Pegah Nochian1, Zahra Atlasbaf2

  • 1Electrical Engineering Department, Tarbiat Modares University, Tehran, Iran. p.nouchian@modares.ac.ir.

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|January 24, 2025
PubMed
Summary

This study introduces a novel ultra-wideband metamaterial linear cross-polarization converter (CPC) for microwave frequencies. The compact device achieves high polarization conversion ratios over a broad bandwidth, suitable for advanced communication systems.

Keywords:
Equivalent circuitMetamaterialPolarization conversion ratioUltra-wideband CPC

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Area of Science:

  • Electromagnetics and Metamaterials
  • Microwave Engineering
  • Applied Physics

Background:

  • Metamaterials offer unique electromagnetic properties not found in natural materials.
  • Cross-polarization conversion is crucial for enhancing signal integrity in communication systems.
  • Existing designs often lack ultra-wideband performance or compactness.

Purpose of the Study:

  • To design and demonstrate a novel, ultra-wideband, thin metamaterial linear cross-polarization converter (CPC).
  • To achieve high polarization conversion ratios over a wide microwave frequency range.
  • To validate the design through simulation and experimental measurements.

Main Methods:

  • Design of a CPC using two concentric deformed rings on a dielectric substrate with a metallic backing.
  • Electromagnetic simulations using CST and FEKO software.
  • Analysis of co- and cross-polarization reflection coefficients and polarization conversion ratio.
  • Investigation of performance under varying polarization and oblique incidence angles.
  • Experimental validation of the fabricated CPC.

Main Results:

  • Achieved a 68% bandwidth from 8.75-17.75 GHz with a polarization conversion ratio exceeding 90%.
  • Demonstrated peak polarization conversion ratios of 99.5%, 99.8%, and 99.3% at specific frequencies.
  • Obtained co-polarization reflection coefficients below -11 dB and cross-polarization reflection coefficients above -1.1 dB.
  • Unit cell dimensions are compact (6.3 × 6.3 × 2 mm³).
  • Simulations showed good agreement with equivalent circuit analysis and experimental results.

Conclusions:

  • The proposed metamaterial CPC is ultra-wideband, thin, and efficient.
  • Its compact size and high performance make it suitable for advanced communication applications.
  • The design shows promise for radar cross-section reduction and electromagnetic interference suppression.