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    Electro-quasistatic human body communication is explored for multiple individuals. This study analyzes the quasistatic approximation limits and models channel gain for secure, low-power wireless applications.

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    Area of Science:

    • Electrical Engineering
    • Biophysics
    • Wireless Communication

    Background:

    • Low-power wireless circuit design increasingly utilizes human body communication (HBC) for its power and security advantages over traditional radio frequency (RF) methods.
    • Current HBC applications are largely limited to single-person scenarios, with a lack of understanding regarding multi-person channel behavior.
    • The quasistatic approximation is a key theoretical concept in HBC, but its validity in multi-body systems is not well-established.

    Purpose of the Study:

    • To analyze the limits of the quasistatic approximation in a multi-human body communication scenario for the first time.
    • To investigate how the quasistatic approximation's validity changes with varying length scales in multi-body systems.
    • To develop a bio-physical circuit model for predicting signal propagation in multi-body HBC.

    Main Methods:

    • Experimental measurement of channel gain with one, two, and three human bodies connected serially to a ground-connected transmitter.
    • Analysis of the quasistatic approximation's behavior as a function of length scale in a multi-body context.
    • Development and validation of a comprehensive bio-physical circuit model to predict received voltage in multi-body HBC.

    Main Results:

    • Measured channel gains were -35 dB (one body), -41 dB (two bodies), and -44 dB (three bodies) for a ground-connected transmitter.
    • The study demonstrates how the quasistatic approximation's accuracy is influenced by the number of human bodies and the relevant length scales.
    • A bio-physical circuit model was successfully generated to predict voltage reception based on serial human body connections.

    Conclusions:

    • This research provides the first analysis of the quasistatic approximation limits in multi-human body communication.
    • The findings offer crucial insights for designing secure, low-power wireless systems using electro-quasistatic HBC.
    • Potential applications include secure key exchange, authentication, and data sharing in multi-user environments.