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An Ultra-Wideband Circularly Polarized Optically Transparent Antenna Using ITO Film.

Kunlun Wang1, Mingyang Liu1,2, Guang Lu1,2

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A novel optically transparent antenna was developed using indium tin oxide (ITO) and PMMA, achieving broadband circular polarization for wireless applications. This transparent antenna integrates seamlessly with smart windows and 5G systems.

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Area of Science:

  • Electromagnetics and Microwave Engineering
  • Materials Science for Electronics
  • Optoelectronics

Background:

  • Optical transparency and broadband circular polarization are crucial for integrated electronic systems.
  • Existing antennas often compromise transparency or polarization performance.
  • Indium tin oxide (ITO) and PMMA offer suitable properties for transparent electronic devices.

Purpose of the Study:

  • To design and demonstrate a novel broadband circularly polarized (CP) optically transparent monopole antenna.
  • To integrate ultra-wideband CP characteristics with high visible-light transmittance.
  • To explore the potential of ITO and PMMA in transparent antenna applications.

Main Methods:

  • A three-layer antenna structure using ITO films for the radiating patch and ground plane, with PMMA as the substrate.
  • Co-optimization of a slotted hexagonal-ring radiating patch, triangular perturbation ground plane, and stepped-impedance feeding structure.
  • Fabrication and experimental validation of the proposed antenna design.

Main Results:

  • Achieved a CP operating bandwidth of 2.8-6.6 GHz (77.9% fractional bandwidth).
  • Obtained an axial ratio < 3 dB and return loss < -15 dB across the operating band.
  • Demonstrated high visible-light transmittance and distinct RHCP/LHCP radiation patterns.

Conclusions:

  • The proposed ITO/PMMA antenna successfully integrates broadband CP operation with optical transparency.
  • The compact design and performance metrics show suitability for smart windows, display integration, and 5G systems.
  • This work presents a viable solution for antennas in visually sensitive applications.