A Small All-Corners-Truncated Circularly Polarized Microstrip Patch Antenna on Textile Substrate for Wearable Passive UHF RFID Tags

Duc Le, Shahbaz Ahmed, Leena Ukkonen, Toni Bjorninen

    Research output: Contribution to journalArticleScientificpeer-review

    2 Citations (Scopus)
    18 Downloads (Pure)

    Abstract

    We present a wearable passive UHF RFID tag based on a circularly polarized (CP) patch antenna on a textile substrate. The antenna miniaturization is based on applying a combination of the cross- and L-shaped slots in the radiator. In conjunction, the right-hand circular polarization is achieved by asymmetrically truncating all four corners of the square-shaped radiator. Despite using a regular low-permittivity textile as the antenna substrate, we downsized the antenna to a 5 cm times ,5 cm footprint with the thickness of 4 mm, which is equal to 0.1525 {lambda }, times ,0.1525 {lambda }, times ,0.0091 {lambda } , where {lambda } is the free space wavelength at 915 MHz. In the numerical modeling and optimization of the antenna, we used a simplified cuboid-shaped and anatomical human body models. In addition to simulated conventional antenna performance indicators, we introduce spatial coverage as a new parameter for assessing the detection reliability of UHF RFID tags. Finally, we measured a manufactured tag worn in four different configurations on the body. The measured axial ratio value was approximately 2 dB in all cases and the tag provided a high attainable read range of around 5.8 meters for a right-hand CP reader emitting 3.28 W EIRP.

    Original languageEnglish
    Pages (from-to)106-112
    Number of pages7
    JournalIEEE Journal of Radio Frequency Identification
    Volume5
    Issue number2
    DOIs
    Publication statusPublished - 2021
    Publication typeA1 Journal article-refereed

    Keywords

    • circular polarization
    • passive UHF RFID tag
    • Wearable antenna
    • wearable RFID tag
    • wireless body-area systems

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • Computer Networks and Communications
    • Instrumentation

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