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  • Wearable slot antenna at 2.45 GHz for off-body radiation: Analysis of efficiency, frequency shift, and body absorption

    Author(s)
    Fernandez, Marta
    Espinosa, Hugo G
    Thiel, David V
    Arrinda, Amaia
    Griffith University Author(s)
    Thiel, David V.
    Espinosa, Hugo G.
    Fernandez Andres, Marta
    Year published
    2018
    Metadata
    Show full item record
    Abstract
    The interaction of body-worn antennas with the human body causes a significant decrease in antenna efficiency and a shift in resonant frequency. A resonant slot in a small conductive box placed on the body has been shown to reduce these effects. The specific absorption rate is less than international health standards for most wearable antennas due to small transmitter power. This paper reports the linear relationship between power absorbed by biological tissues at different locations on the body and radiation efficiency based on numerical modeling (r = 0.99). While the −10 dB bandwidth of the antenna remained constant and ...
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    The interaction of body-worn antennas with the human body causes a significant decrease in antenna efficiency and a shift in resonant frequency. A resonant slot in a small conductive box placed on the body has been shown to reduce these effects. The specific absorption rate is less than international health standards for most wearable antennas due to small transmitter power. This paper reports the linear relationship between power absorbed by biological tissues at different locations on the body and radiation efficiency based on numerical modeling (r = 0.99). While the −10 dB bandwidth of the antenna remained constant and equal to 12.5%, the maximum frequency shift occurred when the antenna was close to the elbow (6.61%) and on the thigh (5.86%). The smallest change was found on the torso (4.21%). Participants with body-mass index (BMI) between 17 and 29 kg/m2 took part in experimental measurements, where the maximum frequency shift was 2.51%. Measurements showed better agreement with simulations on the upper arm. These experimental results demonstrate that the BMI for each individual had little effect on the performance of the antenna. Bioelectromagnetics.
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    Journal Title
    Bioelectromagnetics
    DOI
    https://doi.org/10.1002/bem.22081
    Note
    This publication has been entered into Griffith Research Online as an Advanced Online Version.
    Subject
    Biological sciences
    Engineering
    Antennas and propagation
    Psychology
    Publication URI
    http://hdl.handle.net/10072/368988
    Collection
    • Journal articles

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