Numerical assessment of the performance of a scalp-implantable antenna: Effects of head anatomy and dielectric parameters

Kiourti, A; Nikita, KS

dc.contributor.author	Kiourti, A	en
dc.contributor.author	Nikita, KS	en
dc.date.accessioned	2014-03-01T11:47:06Z
dc.date.available	2014-03-01T11:47:06Z
dc.date.issued	2012	en
dc.identifier.issn	01978462	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/38084
dc.subject	Finite-difference time-domain (FDTD)	en
dc.subject	Implantable antenna	en
dc.subject	Medical Implant Communications Service (MICS) band	en
dc.subject	Medical telemetry	en
dc.subject	Specific absorption rate (SAR)	en
dc.title	Numerical assessment of the performance of a scalp-implantable antenna: Effects of head anatomy and dielectric parameters	en
heal.type	other	en
heal.identifier.primary	10.1002/bem.21753	en
heal.identifier.secondary	http://dx.doi.org/10.1002/bem.21753	en
heal.publicationDate	2012	en
heal.abstract	We numerically assess the effects of head properties (anatomy and dielectric parameters) on the performance of a scalp-implantable antenna for telemetry in the Medical Implant Communications Service band (402.0-405.0MHz). Safety issues and performance (resonance, radiation) are analyzed for an experimentally validated implantable antenna (volume of 203.6mm3), considering five head models (3- and 5-layer spherical, 6-, 10-, and 13-tissue anatomical) and seven scenarios (variations±20% in the reference permittivity and conductivity values). Simulations are carried out at 403.5MHz using the finite-difference time-domain method. Anatomy of the head model around the implantation site is found to mainly affect antenna performance, whereas overall tissue anatomy and dielectric parameters are less significant. Compared to the reference dielectric parameter scenario within the 3-layer spherical head, maximum variations of -19.9%, +3.7%, -55.1%, and -39.2% are computed in the maximum allowable net input power imposed by the IEEE Std C95.1-1999 and Std C95.1-2005 safety guidelines, return loss, and maximum far-field gain, respectively. Compliance with the recent IEEE Std C95.1-2005 is found to be almost insensitive to head properties, in contrast with IEEE Std C95.1-1999. Taking tissue property uncertainties into account is highlighted as crucial for implantable antenna design and performance assessment. Bioelectromagnetics. © 2012 Wiley Periodicals, Inc.	en
heal.journalName	Bioelectromagnetics	en
dc.identifier.doi	10.1002/bem.21753	en