Evaluation of Chipless RFID Indoor Landmarks at 80 GHz and 240 GHz Using FMCW Radars

This paper presents measurements of chipless RFID radar landmarks designed for indoor localization applications at 80 GHz and 240 GHz by means of frequency modulated continuous wave (FMCW) radars. Compared to a vector network analyzer, these radars have the advantage of achieving the readout of a complex signal at a significantly lower cost and footprint. Even without a full calibration, the radars are able to successfully measure the complex backscattered response of the landmarks. This enables the use of FMCW radars as monostatic readers for indoor self-localization applications in highly dynamic and densely cluttered environments.