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Updated: Jun 27, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Optically Transparent Dual-Ring Resonant Frequency Selective Surface Based on ITO Film for Sub-6 GHz Indoor

Yujuan Wei1, Ruichao Zhu1, Shulei Zhang1

  • 1Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices, Air Force Engineering University, Xi'an 710051, China.

Micromachines
|June 26, 2026
PubMed
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This study introduces a novel dual-ring resonant frequency-selective surface (FSS) using Indium Tin Oxide (ITO) films to combat electromagnetic interference (EMI) in indoor wireless communications. The innovative design achieves high optical transparency and effective EMI shielding for C-band frequencies.

Area of Science:

  • Metamaterials and Nanophotonics
  • Electromagnetic Compatibility (EMC)
  • Optical Engineering

Background:

  • Wireless communication quality is degraded by electromagnetic interference (EMI) in complex indoor environments.
  • Traditional metallic resonant structures for EMI filtering lack optical transparency, hindering integration with visual interfaces.
  • Multi-band coexistence in indoor scenarios exacerbates EMI challenges, necessitating advanced filtering solutions.

Purpose of the Study:

  • To develop an optically transparent frequency-selective surface (FSS) for electromagnetic interference (EMI) suppression.
  • To achieve efficient transmission in the C-band (5.35-5.40 GHz) for sub-6 GHz indoor communications while blocking out-of-band interference.
  • To resolve the trade-off between electromagnetic shielding effectiveness and optical transparency in indoor communication systems.
Keywords:
electromagnetic interference (EMI)frequency-selective surface (FSS)indium tin oxide (ITO)metasurfaceoptical transparencysub-6 GHz

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Last Updated: Jun 27, 2026

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Main Methods:

  • Design and simulation of a dual-ring resonant frequency-selective surface (FSS) utilizing Indium Tin Oxide (ITO) films.
  • Fabrication of the proposed metasurface structure.
  • Experimental validation of transmission characteristics and electromagnetic shielding effectiveness in the target C-band frequency range.

Main Results:

  • The designed ITO-based dual-ring FSS demonstrates superior transmission within the 5.35-5.40 GHz passband.
  • Significant out-of-band electromagnetic interference suppression was experimentally confirmed.
  • The fabricated structure exhibits high optical transparency, enabling direct integration onto glass surfaces.

Conclusions:

  • The proposed dual-ring resonant FSS based on ITO films effectively addresses EMI issues while maintaining excellent optical transparency.
  • This compact, passive solution is suitable for optically transparent devices and anti-EMI applications in smart buildings and sub-6 GHz indoor communications.
  • The technology offers a promising approach for enhancing communication quality in visually integrated environments.