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Wearable Polarization Conversion Metasurface MIMO Antenna for Biomedical Applications in 5 GHz WBAN.

Rigeng Wu1, Jian Dong1, Meng Wang1

  • 1School of Computer Science and Engineering, Central South University, Changsha 410083, China.

Biosensors
|January 21, 2023
PubMed
Summary

This study introduces a wearable metasurface antenna for wireless body area networks (WBANs). The antenna offers broadband, circular polarization, and high gain for biomedical applications, ensuring safety with low specific absorption rate (SAR).

Keywords:
MIMOWBANbiomedicalmetasurfacepolarization conversionwearable

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Area of Science:

  • Electrical Engineering
  • Biomedical Engineering
  • Antenna Theory

Background:

  • Wireless Body Area Networks (WBANs) are crucial for remote health monitoring.
  • Metasurface antennas offer advanced capabilities for miniaturization and performance enhancement.
  • Circular polarization (CP) and high gain are desirable for reliable WBAN communication.

Purpose of the Study:

  • To design and evaluate a wearable metasurface multiple-input multiple-output (MIMO) antenna for 5 GHz WBANs.
  • To achieve broadband operation, circular polarization, and high gain for biomedical applications.
  • To ensure the antenna's safety for human use by analyzing specific absorption rate (SAR).

Main Methods:

  • Characteristic mode analysis (CMA) was used to understand antenna properties and polarization conversion.
  • The antenna's performance was evaluated based on impedance bandwidth, axial ratio bandwidth, and element isolation.
  • Specific absorption rate (SAR) simulations were conducted using a human tissue model.

Main Results:

  • The antenna achieved a measured -10 dB impedance bandwidth of 34.87% and a 3 dB axial ratio bandwidth of 22.94%.
  • High isolation (>19.85 dB) between antenna elements was achieved, with a low envelope correlation coefficient (ECC < 0.007).
  • Maximum gain reached 7.95 dBic, and simulated SAR values confirmed compliance with international safety standards.

Conclusions:

  • The proposed wearable metasurface MIMO antenna meets the requirements for WBANs, offering CP, broadband, high gain, and low ECC.
  • The antenna demonstrates excellent performance and safety, making it suitable for wearable biomedical devices.
  • This design advances the development of efficient and safe wireless communication systems for healthcare applications.