Detuning issues and performance of a novel implantable antenna for telemetry applications

In this study, we address design, resonance detuning and performance issues of implantable antennas for biotelemetry in the medical implant communications service (MICS) band (402-405 MHz). A biocompatible skin-implantable antenna model is proposed, which includes varying parameters to deal with the trade-off between miniaturization and gain - enhancement. To speed-up simulations while providing an antenna model for generic (application-independent) skin-tissue implantation, design is performed inside a skin-cube. A 51 mm3 - version of the parametric antenna model is further selected as a compromise between size and exhibited gain, and implanted inside the skin-tissue of canonical head, arm, and trunk models. Inherent resonance detuning issues are discussed and corrected, while the exhibited resonance, radiation and safety performance of the antennas is evaluated and compared. Finite Element (FE) simulations are carried out.

[1]  Konstantina S. Nikita,et al.  Parametric Study and Design of Implantable PIFAs for Wireless Biotelemetry , 2011, MobiHealth.

[2]  Konstantina S. Nikita,et al.  Performance of a novel miniature antenna implanted in the human head for wireless biotelemetry , 2011, 2011 IEEE International Symposium on Antennas and Propagation (APSURSI).

[3]  Kenji Shiba,et al.  Analysis of Current Density and Specific Absorption Rate in Biological Tissue Surrounding Transcutaneous Transformer for an Artificial Heart , 2008, IEEE Transactions on Biomedical Engineering.

[4]  Y. Rahmat-Samii,et al.  Implanted antennas inside a human body: simulations, designs, and characterizations , 2004, IEEE Transactions on Microwave Theory and Techniques.

[5]  Konstantina S. Nikita,et al.  Design of a Novel Miniaturized Implantable PIFA for Biomedical Telemetry , 2010, MobiHealth.

[6]  Anja K. Skrivervik,et al.  3D-Spiral small antenna design and realization for biomedical telemetry in the MICS band , 2009 .

[7]  Tutku Karacolak,et al.  In Vivo Verification of Implantable Antennas Using Rats as Model Animals , 2010, IEEE Antennas and Wireless Propagation Letters.

[8]  R. W. Lau,et al.  The dielectric properties of biological tissues: II. Measurements in the frequency range 10 Hz to 20 GHz. , 1996, Physics in medicine and biology.

[9]  Chao-Ming Wu,et al.  Bandwidth enhancement and size reduction of an implantable PIFA antenna for biotelemetry devices , 2009 .

[10]  Chao-Ming Wu,et al.  Implantable Broadband Circular Stacked Pifa Antenna for Biotelemetry Communication , 2008 .

[11]  M. Sadiku.  Numerical Techniques in Electromagnetics , 2000 .

[12]  Wolfgang Fichtner,et al.  From Dielectrical Properties of Human Tissue to Intra-Body Communications , 2007 .

[13]  C.M. Furse,et al.  Miniaturized biocompatible microstrip antenna using genetic algorithm , 2005, IEEE Transactions on Antennas and Propagation.