Reliability of active RFID tag immersed in water for “preventing infant abduction” application

In this paper, a method is developed to evaluate the reliability of active RFID tags immersed in water. This situation exists in particular when infants wearing anti-rapt tag take bath. This study discusses the effects on the electromagnetic radiation of an emitting tag plunged into a water volume and then proposes a statistical method to predict the radio coverage of the immersed tag. Finally it demonstrates that the RFID technology is barely affected by this issue even though other RFID technologies do not support immersion.