Design of Miniature Implantable Tag Antenna for Radio-Frequency Identification System at 2.45GHz and Received Power Analysis

HoYu LIN  Masaharu TAKAHASHI  Kazuyuki SAITO  Koichi ITO  

IEICE TRANSACTIONS on Communications   Vol.E97-B   No.1   pp.129-136
Publication Date: 2014/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E97.B.129
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
RFID,  in-body wireless communication,  implantable tag antenna,  human body phantom,  received power,  

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In recent years, there has been rapid developments in radio-frequency identification (RFID) systems, and their industrial applications include logistics management, automatic object identification, access and parking management, etc. Moreover, RFID systems have also been introduced for the management of medical instruments in medical applications to improve the quality of medical services. In recent years, the combination of such a system with a biological monitoring system through permanent implantation in the human body has been suggested to reduce malpractice events and ameliorate the patient suffering. This paper presents an implantable RFID tag antenna design that can match the conjugate impedance of most integrated circuit (IC) chips (9.3-j55.2Ω at 2.45GHz. The proposed antenna can be injected into the human body through a biological syringe, owing to its compact size of 9.3mm × 1.0mm × 1.0mm. The input impedance, transmission coefficient, and received power are simulated by a finite element method (FEM). A three-layered phantom is used to confirm antenna performance.