SAR Investigation of Array Antennas for Mobile Handsets

Qiang CHEN  Yasunori KOMUKAI  Kunio SAWAYA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B   No.6   pp.1354-1356
Publication Date: 2007/06/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.6.1354
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on 2nd Pan-Pacific EMC Joint Meeting--PPEMC'06--)
Category: 
Keyword: 
antennas,  arrays,  mobile antennas,  mobile communication,  SAR,  biological effects of electromagnetic radiation,  

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Summary: 
The peak SAR values of two-element array antennas for mobile handsets in the vicinity of a spherical phantom of a human head are evaluated numerically as a function of the distance between the array antenna and the head phantom when the two elements of a two-element array antenna are either co-phase voltage-fed or reverse-phase voltage-fed. It is found that relation between the worst case of the SAR and the phase difference of array elements strongly depends on the distance. When part of the head phantom is located in the reactive near-field region of the array antenna, although the co-phase feed SAR value is slightly smaller than the reverse-phase feed SAR value, the SAR value is practically independent of the phase difference, but when the head is completely outside the reactive near-field region, the co-phase feed SAR value is larger than the reverse-phase feed SAR value.