Wireless Measurement of RFID IC Impedance

Toni Björninen, Mikko Lauri, Leena Ukkonen, Risto Ritala, Atef Z Elsherbeni, Lauri Sydänheimo

    Research output: Contribution to journalArticleScientificpeer-review

    24 Citations (Scopus)
    221 Downloads (Pure)


    Accurate knowledge of the input impedance of an RFID IC at its wake-up power is valuable as it enables the design of a performance-optimized tag for a specific IC. However, since the IC impedance is power-dependent, few methods exist to measure it without advanced equipment. We propose and demonstrate a wireless method, based on electromagnetic simulation and threshold power measurement, applicable to fully assembled RFID tags, to determine the mounted IC’s input impedance in the absorbing state including any parasitics arising from the packaging and the antenna-IC connection. The proposed method can be extended to measure the IC’s input impedance in the modulating state as well.
    Translated title of the contributionWireless Measurement of RFID IC Impedance
    Original languageEnglish
    Pages (from-to)3194-3206
    JournalIEEE Transactions on Instrumentation and Measurement
    Issue number9
    Publication statusPublished - 2011
    Publication typeA1 Journal article-refereed

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