SAR-Probe Calibration System Using Reference Dipole Antenna in Tissue-Equivalent Liquid

Nozomu ISHII  Yukihiro MIYOTA  Ken-ichi SATO  Lira HAMADA  Soichi WATANABE  

Publication
IEICE TRANSACTIONS on Communications   Vol.E95-B   No.1   pp.60-68
Publication Date: 2012/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.60
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2010)
Category: Antenna Measurement
Keyword: 
specific absorption rate (SAR),  probe,  calibration,  tissue-equivalent liquid,  two-antenna method,  gain,  

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Summary: 
The probe used in the conventional SAR measurement is usually calibrated in a well filled with tissue-equivalent liquid surrounded by a rectangular waveguide and a matching dielectric window in the frequency range from 800 MHz to 3 GHz. However, below 800 MHz, the waveguides are too large to be used for the calibration. Therefore, we have developed another technique of calibrating the SAR-probe, that is, relating the output voltage of the probe to the field intensity produced by a reference antenna in the tissue-equivalent liquid by using two-antenna method. In this paper, the calibration system using the reference dipole antennas in the liquid at 450 MHz, 900 MHz and 2450 MHz is presented and far-field gain of the reference antenna and calibration factor of the SAR-probe are measured and compared with those obtained by using the conventional waveguide system.