Abstract
In recent years, Radio Frequency Identification (RFID) systems are expected to be used in the medical field. Therefore we have come to suggest a simple urination detection system by the RFID system. In our presented system a tag is embedded into a diaper worn by a care-receiver and the care-personnel bring a reader close to the tag. Thus, in a dry diaper, the tag can communicate with the reader. However, in a wet diaper, the presented tag cannot communicate with the reader, because the characteristics of the tag antenna are changed by urination. So urination is detected by weather the presented tag can communicate with the reader or not. In this paper, we have designed the tag antenna and analyzed it by numerical calculations. In addition, we fabricated the tag and measured it in a real situation. As a result the presented system can be applied in urination detection.
