Backscattering-based measurement of reactive antenna input impedance

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    29 Citations (Scopus)


    A scattering technique for measuring reactive antenna input impedance is described. The antenna scattering is measured with three different loads: an open circuit, a conjugate match, and a reactive match. The load reactances tune the antenna into resonance at the measurement band. Theory and error considerations are presented, as well as measurement results of two ultra high frequency radio frequency identification antennas. The measurements were performed in a gigahertz transverse electromagnetic mode cell. The measured impedances are within about 10% of the simulated values for a dipole-like antenna. The results of a planar inverted-F antenna are somewhat more complex, but also supported by the presented simulations and the coaxial impedance measurement results.
    Original languageEnglish
    Pages (from-to)469-474
    JournalIEEE Transactions on Antennas and Propagation
    Issue number2
    Publication statusPublished - 2008
    MoE publication typeA1 Journal article-refereed


    • Antenna impedance
    • backscattering
    • radio frequency identification (RFID)
    • ultra high frequency (UHF)


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