Development of RFID Antenna for Detection of Urination

Hiromasa NAKAJIMA  Masaharu TAKAHASHI  Kazuyuki SAITO  Koichi ITO  

IEICE TRANSACTIONS on Communications   Vol.E96-B   No.9   pp.2244-2250
Publication Date: 2013/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E96.B.2244
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
biological tissue-equivalent solid phantom,  paper diaper,  radio frequency identification (RFID),  urination,  finite-difference time-domain (FDTD) method,  

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This paper introduces a radio frequency identification (RFID) tag for urination detection. The proposed tag is embedded into paper diapers in order to detect the patient's urination immediately. For this tag, we designed an RFID tag antenna at 950MHz, which matches the impedance of the associated integrated circuit (IC) chip. In addition, we calculate the antenna characteristics and measure the reflection coefficient (S11) and radiation pattern of the antenna. The results show that this system can be used to detect urination.