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IBID: Intra-Body Identification Using Capacitive Backscatter.

Noor Mohammed1, Robert W Jackson1, Sunghoon Ivan Lee2

  • 1Electrical and Computer Engineering University of Massachusetts Amherst MA, USA.

IEEE International Conference on Rfid-Technologies and Applications : RFID-TA. IEEE International Conference on Rfid-Technologies and Applications
|May 22, 2025
PubMed
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This study introduces intra-body identification (IBID) using capacitive backscatter for data transfer. The novel system enables batteryless tags to communicate with a body-worn device, paving the way for advanced human activity monitoring.

Area of Science:

  • Biomedical Engineering
  • Wearable Technology
  • Communication Systems

Background:

  • Traditional Radio-Frequency Identification (RFID) relies on electromagnetic fields for communication.
  • Intra-body identification (IBID) aims to enable data transmission through physical interactions within the human body.
  • Existing methods face limitations in power requirements and data transmission capabilities.

Purpose of the Study:

  • To present a novel intra-body identification (IBID) technology utilizing capacitive backscatter for data transmission.
  • To explore the feasibility of using IBID for human activity monitoring via body-worn interrogators and object-affixed tags.
  • To address challenges in signal integrity and develop a robust system for reliable ID acquisition.

Main Methods:

Keywords:
Intra-body Identification (IBID)backscatteringcapacitive power transferwireless communication

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  • Developed an IBID system employing capacitive backscatter communication, leveraging human skin conductivity and air-coupled capacitance.
  • Investigated system performance with object models (cylindrical handle, rectangular switch panel) for ID acquisition.
  • Designed and implemented a proof-of-concept tag circuit on a PCB and a reliable interrogator for binary ID demodulation.

    • Main Results:

    • Demonstrated successful implementation of intra-body capacitive backscatter for interrogating binary IDs.
    • Identified signal path gain fluctuations due to tag electrode variations, causing bit distortion.
    • Achieved reliable demodulation and decoding of an 8-bit binary ID using the developed tag and interrogator circuits.

    Conclusions:

    • Intra-body capacitive backscatter is a viable technology for data transmission within the human body.
    • The developed IBID system shows promise for applications in human activity monitoring and beyond.
    • Further research is needed to optimize tag design and mitigate signal variations for enhanced performance.