Millimetre-wave scanning radar for the detection and remote reading of passive electromagnetic sensors

This communication reports the latest developments in Frequency-Modulated Continuous-Wave (FMCW) radar interrogation technique for chipless and wireless sensors. For the first time a millimetre-wave scanning radar is used for detecting and reading passive and chipless electromagnetic sensors. Measurement results show that, with a 24 cm depth resolution and a 2 degrees angular resolution, it is possible to localize and distinguish two passive sensors separated by 5 cm at a distance of 3 meters from a FMCW radar operating at 30GHz. Sensing modes visualization derived from the millimetre-wave radar scanning of a scene makes possible the separation length measurement with an accuracy of 1cm.

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