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Interconnect-free DRA-SAW RFID Sensing System for High Temperature Monitoring

This paper presents a new sensing system with a Dielectric Resonator Antenna (DRA) serving both as interconnect-free package and antenna for a Surface Acoustic Wave (SAW) sensor aimed at high temperature industrial monitoring applications. The DRA is made of Alumina (99.7% of purity) well recognized by its permanent and steady properties at high temperatures exceeding 1000°C. It is placed on an AlN/Sapphire plate on which the SAW sensor is printed. The system operates at 2.45GHz where an excellent matching is obtained with a quite good radiation characteristics for the DRA which offers a wide range of angles for interrogating the sensor.