Capacitively-coupled UHF antennas for wireless temperature monitoring of bearings in electric vehicles

This work introduces a capacitively-coupled telemetry system operating in the UHF band (868-960 MHz). It is based on two concentric C-shaped dipoles positioned at a millimeter distance. Numerical simulations have been employed to optimize the angular dimensions of the antennas, and the resulting arrangement ensures a stable link for any mutual orientation. Preliminary experiments conducted with a mock-up have demonstrated that sensing and communication through backscattering modulation can be achieved with only 400 μW of power.