Abstract
Body-centric wireless systems demand wearable sensor and tag antennas that have robust impedance matching and provide enough gain for a reliable wireless communication link. In this paper, we discuss a novel and practical technique for the modeling of the human body in UHF RFID body-centric wireless systems. What makes this technique different is that we base the human model on measured far-field response from a reference tag attached to the human body. Hereby, the human body model accounts for the encountered human body effects on the tag performance. The on-body measurements are fast, which allows establishing a catalog of human body models for different tag locations and human subjects. Such catalog would provide a ready simulation model for a wide range of wireless body-centric applications in order to initiate a functional design. Our results demonstrate that the suggested modeling technique can be used in the design and optimization of wearable antennas for different real-case body-centric scenarios.
Highlights
Wireless monitoring of humans by means of low-power and low-cost UHF (860–960 MHz) radio frequency identification (RFID) is rapidly emerging
The wearable antenna is a key component of the body-centric system as it provides the wireless communication link between body-worn electronics and base stations located in the surrounding
We first consider the measured response from a reference RFID tag attached to a human volunteer subject as the true tag response
Summary
Wireless monitoring of humans by means of low-power and low-cost UHF (860–960 MHz) radio frequency identification (RFID) is rapidly emerging. We first consider the measured response from a reference RFID tag attached to a human volunteer subject as the true tag response This includes the effect of high permittivity and dissipative tissues and effects of polarization between tag and reader antennas, air between the tag and the body, uneven body surface, and shadowing. The time to conduct a complete set of on-body measurements for a given tag location and human volunteer subject is rather short. This enables conducting fast measurements for different tag locations on body and for several human volunteer subjects, which allows one to create an average statistical catalog of human body models for each scenario Creation of such catalog provides a practical, fast, and acceptably accurate engineering tool for initiating the design of optimized wearable antennas in bodycentric systems.
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