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<p>The performance of a video capsule endoscope (VCE) antenna is affected by human tissues, resulting in limited communication range. This work focuses on investigating the utilization of ferrite for an impedance matching layer (IML) at the skin–air interface, with the aim of enhancing the transmission range of the VCE antenna when it operates in multilayer tissues. This work also aims to validate the potential for a lower profile of ferrite as an IML by leveraging its magnetoelectric properties, with the goal of enhancing patient comfort and convenience. Transmission line theory is used to derive the electromagnetic parameters and thickness of the ferrite IML in a multilayer tissue environment for reducing reflection losses. It has been proven that a ferrite IML can meet the two key requirements mentioned above. This work designs a robust VCE antenna that operates in the Industrial, Scientific, and Medical (ISM) 915&#xa0;MHz band. Through simulations and experiments, it is verified that the use of the ferrite IML significantly enhances the gain of the VCE antenna by 2 dBi and transmission coefficient by 1&#xa0;dB, effectively extending the transmission range of the VCE antenna. At the same time, this implementation achieves a reduction in the profile of the IML. This study holds great significance for improving the performance of ingestible or implantable electronic devices within the human body.</p>

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Enhancing the Transmission Range of Video Capsule Endoscope Antennas Using Ferrite as an Impedance Matching Layer Based on Transmission Line Theory

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Yongwei Li,
  • Quanyuan Feng

摘要

The performance of a video capsule endoscope (VCE) antenna is affected by human tissues, resulting in limited communication range. This work focuses on investigating the utilization of ferrite for an impedance matching layer (IML) at the skin–air interface, with the aim of enhancing the transmission range of the VCE antenna when it operates in multilayer tissues. This work also aims to validate the potential for a lower profile of ferrite as an IML by leveraging its magnetoelectric properties, with the goal of enhancing patient comfort and convenience. Transmission line theory is used to derive the electromagnetic parameters and thickness of the ferrite IML in a multilayer tissue environment for reducing reflection losses. It has been proven that a ferrite IML can meet the two key requirements mentioned above. This work designs a robust VCE antenna that operates in the Industrial, Scientific, and Medical (ISM) 915 MHz band. Through simulations and experiments, it is verified that the use of the ferrite IML significantly enhances the gain of the VCE antenna by 2 dBi and transmission coefficient by 1 dB, effectively extending the transmission range of the VCE antenna. At the same time, this implementation achieves a reduction in the profile of the IML. This study holds great significance for improving the performance of ingestible or implantable electronic devices within the human body.