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  • An inward directed antenna for gastro-intestinal radio pill tracking at 2.45 GHz

    Author(s)
    Fernandez, Marta
    Thiel, David V
    Arrinda, Amaia
    Espinosa, Hugo G
    Griffith University Author(s)
    Thiel, David V.
    Espinosa, Hugo G.
    Year published
    2018
    Metadata
    Show full item record
    Abstract
    The accurate location of an ingested transmitter requires an array of surface electric field sensors worn on the body for more than 24 h. The small antenna (33 mm × 33 mm × 11 mm) consisting of a conductive box with a small slot (28 mm × 7 mm) pressed against the body with a centrally located feed probe was optimized to match the body impedance when located on the torso. The antenna properties when placed on different locations of the torso were calculated using computer modeling and verified using reflection measurements on 6 participants with body‐mass index between 17 and 27 kg/m2. Small center frequency shifts because ...
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    The accurate location of an ingested transmitter requires an array of surface electric field sensors worn on the body for more than 24 h. The small antenna (33 mm × 33 mm × 11 mm) consisting of a conductive box with a small slot (28 mm × 7 mm) pressed against the body with a centrally located feed probe was optimized to match the body impedance when located on the torso. The antenna properties when placed on different locations of the torso were calculated using computer modeling and verified using reflection measurements on 6 participants with body‐mass index between 17 and 27 kg/m2. Small center frequency shifts because of placing the antenna on different bodies and locations were within the 2.45 GHz bandwidth in all cases. The −10 dB bandwidth takes values between 0.75 and 0.97 GHz in simulations and between 0.51 and 1.15 GHz in measurements. The antenna design shows front‐to‐back isolation higher than 15 dB. The experimental results were not related to the body‐mass index of the participants.
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    Journal Title
    Microwave and Optical Technology Letters
    Volume
    60
    Issue
    7
    DOI
    https://doi.org/10.1002/mop.31217
    Subject
    Atomic, molecular and optical physics
    Electronics, sensors and digital hardware
    Communications engineering
    Publication URI
    http://hdl.handle.net/10072/376122
    Collection
    • Journal articles

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