TY - GEN
T1 - Modified Wheeler Cap Approach for Radiation Efficiency Measurements of On-body RFID Antennas
AU - Rishani, Nadeen R.
AU - Laheurte, Jean Marc
AU - Hussein, Mousa I.
AU - Daher, Abdulrahman
N1 - Publisher Copyright:
© 2024 IEEE.
PY - 2024
Y1 - 2024
N2 - In this paper, the radiation efficiency of a differentially fed loop antenna is measured using the modified Wheeler Cap (WC) technique. The antenna is matched to the Alien Higgs 9 RFID chip, when placed on a human body-mimicking gel. Characterization of the used gel is first performed, followed by measurements of the wake-up power and impedance of the RFID chip. The WC method using the modified Johnston's equation published in an earlier work, is applied for radiation efficiency measurements of the proposed loop. Read range measurements are performed for the tag as well, and radiation efficiency is extracted using Friis formula. It is showcased that, for balanced antennas fed by a differential port, and placed over lossy matter giving low overall antenna efficiency, the WC modified method can be applied to measure the radiation efficiency by normalizing the S 11 plots to the chip resistance.
AB - In this paper, the radiation efficiency of a differentially fed loop antenna is measured using the modified Wheeler Cap (WC) technique. The antenna is matched to the Alien Higgs 9 RFID chip, when placed on a human body-mimicking gel. Characterization of the used gel is first performed, followed by measurements of the wake-up power and impedance of the RFID chip. The WC method using the modified Johnston's equation published in an earlier work, is applied for radiation efficiency measurements of the proposed loop. Read range measurements are performed for the tag as well, and radiation efficiency is extracted using Friis formula. It is showcased that, for balanced antennas fed by a differential port, and placed over lossy matter giving low overall antenna efficiency, the WC modified method can be applied to measure the radiation efficiency by normalizing the S 11 plots to the chip resistance.
KW - body mimicking gels
KW - modified Wheeler Cap method
KW - onbody tags
KW - radiation efficiency
KW - RFID antennas
KW - RFID chip characterization
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U2 - 10.1109/MoSICom63082.2024.10881639
DO - 10.1109/MoSICom63082.2024.10881639
M3 - Conference contribution
AN - SCOPUS:85219633409
T3 - IEEE International Conference on Modeling, Simulation and Intelligent Computing, MoSICom 2024 - Proceedings
SP - 240
EP - 243
BT - IEEE International Conference on Modeling, Simulation and Intelligent Computing, MoSICom 2024 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2024 IEEE International Conference on Modeling, Simulation and Intelligent Computing, MoSICom 2024
Y2 - 9 December 2024 through 11 December 2024
ER -