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This paper describes the development of a Direct Driven Resonant Radiator (DDRR) antenna for an ultra-low power UHF RFID tag system, integrating an accelerometer for movement tracking using a passive backscattering communications link. An outline of a system intended for healthcare applications involving wireless movement detection, such as therapeutic recovery exercises is described. The tag comprises of a UHF RFID transponder connected to a 4 cm (<inline-formula> <tex-math notation="LaTeX">$0.115\lambda$ </tex-math></inline-formula>) diameter, 1 mm thick (<inline-formula> <tex-math notation="LaTeX">$0.0028\lambda$ </tex-math></inline-formula>) skin-mounted antenna. Off-body read ranges of 3.6 m with 1 kB/s data communication are achieved. The DDRR radiation pattern is a limiting factor in movement tracking, offering only limited angles of detection, which could be improved with spatial diversity in the reader antennas.

An On-Body UHF RFID Tag With DDRR Antenna for Healthcare Data Streaming Applications