Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 18, Issue 4, Pages 684-687Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2019.2901202
Keywords
Epidermal electronics; flexible electronics; radio frequency identification (RFID); skin sensors
Funding
- Lazio Innova Second Skin project [85-2017-14774]
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Current advances of the radio frequency identification (RFID) technology can boost the emerging class of biointegrated skin devices exploiting low-power (even passive) wireless communication and sensing interfaces. This work describes a small-size (3 cm x 3 cm) flexible UHF RFID board conceived for the rapid laboratory experimentation and suitable to multipurpose monitoring of physical parameters (e.g., temperature and sweat) over the skin and/or over clothing layers and medical plasters. An engineered open-loop antenna is coupled with a two-way discrete (four states) tuning circuit to compensate the frequency shifts that occur in real applications due to the intrinsic variability of the human body. The capability of the tuning mechanism to down/up-shift the operating frequency and to restore the default state is validated by means of both numerical simulation and measurements over some volunteers in realistic conditions.
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