Abstract
This Letter presents an investigation of the effect of human tissue conductivity and permittivity on the performance of epidermal transfer tattoo ultra-high frequency radio-frequency identification (RFID) tags. The measurements were carried out on 20 individuals and the variations in the measured dielectric properties correlate well with variations in the measured tag read range on the individuals and to a lesser extent with their body mass index values. Simulation results also showed the effects of permittivity and conductivity on the designed resonance frequency of the RFID tag.
Highlights
There has been an increase in the use of body mounted devices such as radio-frequency identification (RFID) tags and other sensors in recent years
The density of the underlying fat tissues, muscles and bone in the area being considered can affect the electrical properties of the body [12, 13] studied the influence of general lossy dielectric objects on the resonance frequency of RFID antennas
The influence of variation in body tissue composition on skin mounted UHF RFID tags has been shown in this Letter
Summary
There has been an increase in the use of body mounted devices such as radio-frequency identification (RFID) tags and other sensors in recent years These devices can be used in hospital environments for patient monitoring and tracking [1] and as sensors [2] due to their non-invasive nature. The influence of the electrical properties of the skin and different body types on the functioning of epidermal UHF RFID tattoo tags of the kind reported in [5,6,7,8] is studied in this Letter This stems from the differences in tag read ranges observed when an identical tag is measured on different individuals. The aim of this Letter is to establish directly the degree of influence skin permittivity and conductivity variations have on the performance of the transfer tattoo tag in terms of read range when mounted on the forearm
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