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A number of wearable antennas suitable for implementation of UHF-RFID tags have been presented in the open scientific literature. All of them are characterized by a high sensitivity with respect to the coupling with the human body, both on the input matching and on the antenna efficiency. This work presents a numerical investigation performed over a couple of wearable, ungrounded, antennas configurations,...
The robustness of wearable UHF-band grounded antennas with respect to body-coupling effects is addressed through numerical investigations. Main goal is gaining physical insights on the relationship between the grounded antenna performance and the distribution of the electric and magnetic energy densities in the antenna near-field region close to the ground plane border. Two UHF Planar Inverted-F Antennas...
A printer-encoder antenna has to reliably communicate with only one targeted tag among a number of tightly spaced transponders in very close proximity. Moreover, the distance between the encoder and transponder antennas is typically a few millimeters only. Thus, antennas for UHF-RFID printer encoders are more similar to electromagnetic couplers than to antennas, and a specific analysis is required...
The robustness of grounded wearable antennas for UHF-RFID (Radio Frequency Identification) transponders with respect to the body-coupling effects, is here addressed through numerical simulations. The analysis is performed in terms of the distribution of electric and magnetic energy densities close to the antenna borders.
In this paper near-field coupling in UHF-RFID systems is investigated. The wireless power transfer among reader and tag antennas is addressed through a numerical model involving different reader antennas and a short-range tag. System performance is investigated in terms of both mutual impedance and power transfer efficiency. Finally, a new near-field reader antenna based on coplanar waveguide technology...
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