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  • External parasitic elements on clothing for improved performance of wearable antennas

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    Author
    Vatankhah Varnoosfaderani, Mohammad
    Thiel, David
    Lu, Junwei
    Year published
    2015
    Metadata
    Show full item record
    Abstract
    A small (30 mm נ50 mm נ8 mm), waterproof 2.45 GHz wireless sensor with a standard meander line printed monopole has poor radiation characteristics when placed against the human body. A suitably optimized H-shape (step impedance resonator) parasitic element was added next to the antenna of the sensor on outer surface of clothing fabric. The parasitic element was placed on the outside of a fabric armband and was found to increase the total efficiency of the antenna by 13% in simulation results and enhanced the measured gain by 3 dB. The technique ensures that the armband is comfortable, washable, flexible, and operates successfully without wired connectors. The technique was optimized using simulation and experimental measurements with an adhesive aluminum strip. As the wireless sensor is waterproof and there is no access to the port of the antenna in the sensor, a two ray ground reflection model was used to match the received power in the spectrum analyzer using least rms curve fitting.
    Journal Title
    IEEE Sensors Journal
    Volume
    15
    Issue
    1
    DOI
    https://doi.org/10.1109/JSEN.2014.2343245
    Copyright Statement
    © 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Subject
    Antennas and Propagation
    Biomedical Instrumentation
    Publication URI
    http://hdl.handle.net/10072/69542
    Collection
    • Journal articles

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