2cm diameter Antenna & Sharp Multi-threshold Detection Thin-film RFID Tags on Flexible substrate

RFID tags are embedded in everyday objects providing extra functionalities and aiming to connect them to the cloud. Miniaturization of flexible RFID tags enables the integration into smaller everyday health, entertainment, food related objects, besides enhancing security and decreasing the cost. In addition, external sensor integration and readout enable new applications for the sensor tags. In this paper a miniaturized 2cm (1€ coin size) diameter antenna is combined with a flexible InGaZnO thin-film RFID chip operating at 3V and transmitting data at 7.3kHz. Moreover, the sharp threshold detection (<500k Ω) of a resistive temperature sensor is demonstrated using the same technology, enabling multi-threshold detection on flexible and ultrathin (<15µm) substrates.