PblshrPDF_IEEETAP_LowSAR.pdf (1.66 MB)
Low SAR ferrite handset antenna design
journal contribution
posted on 2007-07-04, 14:56 authored by Maria I. Kitra, Chinthana PanagamuwaChinthana Panagamuwa, Patrick McEvoy, J. C. Vardaxoglou, J.R. JamesThe benefits resulting from the inclusion of ferrite in material loaded antennas are investigated, initially through the
use of a spherical analytic model and then through a TLM
simulation tool applied to a rectangular slab geometry. It is
observed that a material with equality of relative permittivity
and permeability in combination with specific positioning of the
antenna in relation to the head, can result in the definitive smallsize,
high efficiency and bandwidth, low Specific Absorption Rate
(SAR) antenna. The accuracy of the simulations is validated both
through efficiency and SAR measurements of three material
coated monopole samples. Further research into optimizing the
above attributes and translating them into a handset antenna
leads to a multi-band antenna design covering the GSM 1800,
1900, UMTS and Bluetooth bands, with a SAR value reduced by
88% compared to conventional phones and an efficiency of 38%
at 1.8GHz. A tri-band antenna design is also presented, utilizing
currently available lossy ferrite material and it is considered as
the first step towards the feasibility of the ultimate low SAR
multi-band ferrite handset antenna, until further material
development specifically for antenna applications takes place.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Citation
KITRA, M. I. ... et al (2007). Low SAR ferrite handset antenna design. IEEE Transactions on Antennas and Propagation, 55 (4) pp. 1155-1164Publisher
© Institute of Electrical and Electronics Engineers (IEEE)Publication date
2007Notes
This article was published in the journal, IEEE Transactions on Antennas and Propagation[© IEEE], and is available at: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=8 Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.Language
- en