2022
DOI: 10.1109/tap.2021.3137517
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Efficient Modeling of On-Body Passive UHF RFID Systems in the Radiative Near-Field

Abstract: A novel method is presented to accurately determine the operational range of an on-body, passive ultra-high-frequency (UHF) radio-frequency identification (RFID) system operating in the radiative near-field, based on its far-field radiation patterns. To this end, an efficient algorithm based on 3-D multipole expansion of the electromagnetic fields is formulated. By combining the new operator with the simulated or measured standalone far-field radiation patterns of the on-body RFID system, a comprehensive and a… Show more

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Cited by 2 publications
(3 citation statements)
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“…The electric field , generated by the current density and defined with respect to is then obtained by the electric field integral equation (EFIE) [ 35 ], which reads where is the angular frequency, and is the free-space permeability. In ( 1 ), we make use of a multipole expansion for the dyadic Green’s function [ 36 ] detailed in Appendix A and valid for = , i.e., where ( Figure 2 b) is the radius of the sphere circumscribing the current distribution and thus the antenna array, measured with respect to . Further, k is the wavenumber, represents the unit dyadic, and is the complex conjugate of the order, degree scalar spherical harmonic [ 37 ].…”
Section: Theorymentioning
confidence: 99%
“…The electric field , generated by the current density and defined with respect to is then obtained by the electric field integral equation (EFIE) [ 35 ], which reads where is the angular frequency, and is the free-space permeability. In ( 1 ), we make use of a multipole expansion for the dyadic Green’s function [ 36 ] detailed in Appendix A and valid for = , i.e., where ( Figure 2 b) is the radius of the sphere circumscribing the current distribution and thus the antenna array, measured with respect to . Further, k is the wavenumber, represents the unit dyadic, and is the complex conjugate of the order, degree scalar spherical harmonic [ 37 ].…”
Section: Theorymentioning
confidence: 99%
“…In this contribution, we propose a novel far-to-near-field transformation, based on a multipole expansion of the RFID system's far fields. In contrast to [19], where the advocated algorithm is applied to a RFID tag antenna on the chest, here we focus on the more challenging case of deployment on the arm. The far fields are measured or simulated when deploying the RFID tag on-body, as such accounting for platform effects.…”
Section: Introductionmentioning
confidence: 99%
“…1. RFID system composed of reader and tag represented by current densities j r and j t , present in volumes Vr and Vt located at rr and rt and circumscribed by spheres of radius Rr and Rt, respectively (for a detailed description, see [19]).…”
Section: Introductionmentioning
confidence: 99%