Novel Micro-fluidic Structures for Wireless Passive Temperature Telemetry Medical Systems Using Radar Interrogation Techniques in Ka-band

Sofiene Bouaziz 1 Franck Chebila 1 Anya Traille 1 Patrick Pons 1 Hervé Aubert 1 Manos Tentzeris 2
1 LAAS-MINC - Équipe MIcro et Nanosystèmes pour les Communications sans fil
LAAS - Laboratoire d'analyse et d'architecture des systèmes
2 Georgia Institute of Technology [Atlanta]
Abstract : We present a new miniaturized (below 1mm3) temperature sensor based on micro-fluidic technology and radar passive interrogation principles, that can be easily applied for temperature telemetry for medical applications. The chipless micro-system is made up of a planar-gap capacitor with a micro-channel located in between its plates. The temperature-dependent expansion/shrinkage of the water inside the micro-channel modifies in a monotonic way the liquid level across the capacitor. The resulting change in the effective permittivity modifies the capacitance value in a temperature-dependent way. The first prototypes of the temperature micro-sensor were micro-machined and integrated with an antenna, while the ambient temperature was remotely measured using FMCW radar interrogation principles at 29.75 GHz. Preliminary measurement results demonstrated a 0.4dBm/°C sensitivity over a 9°C temperature range (24°C-33°C).
Keywords : Temperature micro-sensor micro-fluidic wireless sensor passive and chipless sensor FMCW radar remote sensing electromagnetic transduction
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Sofiene Bouaziz, Franck Chebila, Anya Traille, Patrick Pons, Hervé Aubert, et al.. Novel Micro-fluidic Structures for Wireless Passive Temperature Telemetry Medical Systems Using Radar Interrogation Techniques in Ka-band. IEEE Antennas and Wireless Propagation Letters, Institute of Electrical and Electronics Engineers, 2012, 11, pp.1706-1709. ⟨hal-00878064⟩

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