Design of Miniaturized and Bandwidth-Enhanced Implantable Antenna on Dielectric/Ferrite Substrate for Wireless Biotelemetry

Jae-Ho LEE  Dong-Wook SEO  

IEICE TRANSACTIONS on Communications   Vol.E100-B    No.2    pp.227-233
Publication Date: 2017/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2016WSP0001
Type of Manuscript: Special Section PAPER (Special Section on Antenna and Propagation Technologies Contributing to Realization of Next Generation Wireless Systems)
antenna miniaturization,  bandwidth enhancement,  implantable antenna,  MICS,  magneto-dielectrics,  wireless biotelemetry,  

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A miniaturized and bandwidth-enhanced implantable antenna is designed for wireless biotelemetry in the medical implantable communications service (MICS) frequency band of 402-405MHz. To reduce the antenna size and enhance the available bandwidth with regard to the reflection coefficients, a meandered planar inverted-F antenna (PIFA) structure is adopted on a dielectric/ferrite substrate which is an artificial magneto-dielectric material. The potential of the proposed antenna for the intended applications is verified through prototype fabrication and measurement with a 2/3 human muscle phantom. Good agreement is observed between the simulation and measurement in terms of resonant characteristics and gain radiation patterns; the bandwidth is enhanced in comparison with that of the ferrite-removed antenna, and antenna gain of -27.7dB is obtained in the measurement. Allowances are made for probable fabrication inaccuracies and practical operating environments. An analysis of 1-g SAR distribution is conducted to confirm compliance with the specific absorption rate limitation (1.6W/kg) of the American National Standards Institute (ANSI).