Wearable Metasurface-Enabled Quasi-Yagi Antenna for UHF RFID Reader with End-Fire Radiation along the Forearm

Shahbaz Ahmed, Duc Le, Lauri Sydänheimo, Leena Ukkonen, Toni Björninen

    Tutkimustuotos: ArtikkeliScientificvertaisarvioitu

    12 Sitaatiot (Scopus)
    55 Lataukset (Pure)

    Abstrakti

    We present a quasi-Yagi antenna mounted on a periodic surface for a wearable UHF RFID reader operating in the UHF RFID frequency band centered at 915 MHz. The periodic surface was co-optimized with the antenna to enhance the launching of surface waves to enable the end-fire radiation along the forearm so that a user can identify objects by pointing her/his hand towards them. In addition to the radiation pattern modification, the ground plane of the periodic surface serves the second purpose of isolating the antenna from the human body. We optimized the antenna in a full-wave EM simulator using a simplified cylindrical model of the forearm and in the simulation, it achieved the end-fire directivity of 5.9 dBi along the forearm. In the wireless testing, the quasi-Yagi antenna provided the read range of 3.8 m for a typical UHF RFID tag having 0 dBi gain when the reader’s output power was 32 dBm that corresponds with EIRP = 0.56 W and SAR = 0.191 W/kg in our simulations. Considering both, the RFID emission regulations with EIRP = 3.28 W or 4 W and the SAR limit of 1.6 W/kg averaged over 1 gram of tissue, the read range could be further enhanced for reader units with higher output power.

    AlkuperäiskieliEnglanti
    Sivut77229 - 77238
    JulkaisuIEEE Access
    Vuosikerta9
    DOI - pysyväislinkit
    TilaJulkaistu - 2021
    OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

    Julkaisufoorumi-taso

    • Jufo-taso 2

    !!ASJC Scopus subject areas

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