Parametric study of power absorption patterns induced in adult and child head models by small helical antennas

Christopoulou, M; Koulouridis, S; Nikita, KS

dc.contributor.author	Christopoulou, M	en
dc.contributor.author	Koulouridis, S	en
dc.contributor.author	Nikita, KS	en
dc.date.accessioned	2014-03-01T01:31:37Z
dc.date.available	2014-03-01T01:31:37Z
dc.date.issued	2009	en
dc.identifier.issn	1559-8985	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19851
dc.subject	Parametric Study	en
dc.subject.classification	Engineering, Electrical & Electronic	en
dc.subject.classification	Physics, Applied	en
dc.subject.classification	Telecommunications	en
dc.subject.other	Absorbed power	en
dc.subject.other	Adult and child head model	en
dc.subject.other	Age-related	en
dc.subject.other	Comparative assessment	en
dc.subject.other	Down-scaling	en
dc.subject.other	Finite difference time domain simulations	en
dc.subject.other	Head model	en
dc.subject.other	Mobile communications	en
dc.subject.other	Non-uniform scaling	en
dc.subject.other	Parametric study	en
dc.subject.other	Power absorption	en
dc.subject.other	Realistic exposure scenario	en
dc.subject.other	Semi-analytical methods	en
dc.subject.other	Separation distances	en
dc.subject.other	Spherical head models	en
dc.subject.other	Three-layer	en
dc.subject.other	Absorption	en
dc.subject.other	Ceramic capacitors	en
dc.subject.other	Dielectric properties	en
dc.subject.other	Differential equations	en
dc.subject.other	Directional patterns (antenna)	en
dc.subject.other	Finite difference time domain method	en
dc.subject.other	Green's function	en
dc.subject.other	Helical antennas	en
dc.subject.other	Radar antennas	en
dc.subject.other	Synthetic apertures	en
dc.subject.other	Method of moments	en
dc.title	Parametric study of power absorption patterns induced in adult and child head models by small helical antennas	en
heal.type	journalArticle	en
heal.identifier.primary	10.2528/PIER09031305	en
heal.identifier.secondary	http://dx.doi.org/10.2528/PIER09031305	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	A comparative assessment of power absorption in adult and child heads exposed to a small helical antenna at 1710 MHz, is presented, emphasizing the effect of age related parameters. Finite Difference Time Domain simulations are employed to study the interaction between MRI-based head models and a mobile communication terminal equipped with a small helical monopole. A semi-analytical method, based on Green's function theory and the Method of Moments, is used to study the absorption in three-layer spherical head models exposed to a small helical dipole. SAR patterns in child head models derived by non-uniform scaling of adult ones were assessed against SAR patterns computed in child heads derived by uniform down scaling procedures. In both realistic and canonical exposure scenarios, comparable levels of absorbed power (maximum difference: 12%) in adult and child head models were observed. Dependence of SAR values upon separation distance and tissue dielectric properties was quantitatively assessed. In realistic exposure scenarios, the reduction in peak SAR values was 60-80% for a 1 cm increase in distance and up to 16% for a 110% to 90% decrease in dielectric properties values with reference to the nominal value of 100%. These trends were respectively less(55-65%) and more(up to 24%) emphasized in the corresponding canonical exposure scenarios.	en
heal.publisher	E M W PUBLISHING	en
heal.journalName	Progress in Electromagnetics Research	en
dc.identifier.doi	10.2528/PIER09031305	en
dc.identifier.isi	ISI:000271115400004	en
dc.identifier.volume	94	en
dc.identifier.spage	49	en
dc.identifier.epage	67	en