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Low SAR ferrite handset antenna design

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journal contribution
posted on 04.07.2007, 14:56 by Maria I. Kitra, Chinthana PanagamuwaChinthana Panagamuwa, Patrick McEvoy, J. C. Vardaxoglou, J.R. James
The 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. 1155-1164

Publisher

© Institute of Electrical and Electronics Engineers (IEEE)

Publication date

2007

Notes

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