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Passive chipless wireless pressure sensor based on dielectric resonators

This paper presents a novel approach in passive chipless wireless pressure sensing for tool monitoring in smart factories. The working principle is based on the pressure dependent detuning of a dielectric resonator resulting in a notch in the backscattered spectrum at its resonance frequency. The read-out of the sensor is performed by a reader device that transmits a broadband signal and makes use of time gating to remove clutter from the machine or other environmental obstacles. The dielectric resonator approach is chosen since it allows for these long impulse response times and simultaneously enables high pressure sensitivity and flexibility for the measurement range. Furthermore, the proposed sensor concept is applicable in harsh environments in terms of strong vibrations and high temperatures. The functionality of the design is confirmed by simulation results and experimentally validated.