A UHF RFID sensor tag system with externally connected sensor component

The presented work focuses on the development of RFID sensor tags utilizing external sensor de-vices via long cable connections of up to 4 m, which is often needed to overcome spatial restrictions in different machines of industrial processes, due to fully metallic housings or limited space condi-tions. The influences of the large distances between sensor element and RFID integrated circuit on the tag of the RFID sensor system itself are analyzed and practical issues are addressed to enable a measurement over a long read-out range with a standard UHF reader device.