A Novel SAR-Probe Calibration Method Using a Waveguide Aperture in Tissue-Equivalent Liquid

Nozomu ISHII; Lira HAMADA; Soichi WATANABE

doi:10.1587/transcom.E97.B.2035

Open Access
A Novel SAR-Probe Calibration Method Using a Waveguide Aperture in Tissue-Equivalent Liquid

Nozomu ISHII, Lira HAMADA, Soichi WATANABE

Full Text Views

101

Cite this

Free PDF (1.4MB)

Summary :

A novel method for calibrating the probes used in standard measurement systems to evaluate SAR (specific absorption rate) of the radio equipment operating at frequencies over 3GHz is proposed. As for the proposed method, the electric-field distribution produced by a waveguide aperture installed in a liquid container is used to calibrate the SAR probe. The field distribution is shown to be the same as that given by a conventional calibration method by analytically deriving a closed-form expression for the field produced by the waveguide aperture with the help of the paraxial approximation. Comparing the approximated and measured distributions reveals that the closed-form expression is valid for the electric-field distribution near the central axis of the aperture. The calibration factor for a commercial SAR probe is evaluated by the proposed method and agrees well with that provided by the manufacturer of the probe.

Publication: IEICE TRANSACTIONS on Communications Vol.E97-B No.10 pp.2035-2041

Publication Date: 2014/10/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.E97.B.2035

Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Measurement and Design Techniques on Antennas, Propagation and Wireless Systems)

Category

Authors

Nozomu ISHII
  Niigata University,National Institute of Information and Communications Technology
Lira HAMADA
  National Institute of Information and Communications Technology
Soichi WATANABE
  National Institute of Information and Communications Technology

Keyword

specific absorption rate (SAR), probe calibration, tissue-equivalent liquid, waveguide aperture

Cite this

Copy

Nozomu ISHII, Lira HAMADA, Soichi WATANABE, "A Novel SAR-Probe Calibration Method Using a Waveguide Aperture in Tissue-Equivalent Liquid" in IEICE TRANSACTIONS on Communications, vol. E97-B, no. 10, pp. 2035-2041, October 2014, doi: 10.1587/transcom.E97.B.2035.
Abstract: A novel method for calibrating the probes used in standard measurement systems to evaluate SAR (specific absorption rate) of the radio equipment operating at frequencies over 3GHz is proposed. As for the proposed method, the electric-field distribution produced by a waveguide aperture installed in a liquid container is used to calibrate the SAR probe. The field distribution is shown to be the same as that given by a conventional calibration method by analytically deriving a closed-form expression for the field produced by the waveguide aperture with the help of the paraxial approximation. Comparing the approximated and measured distributions reveals that the closed-form expression is valid for the electric-field distribution near the central axis of the aperture. The calibration factor for a commercial SAR probe is evaluated by the proposed method and agrees well with that provided by the manufacturer of the probe.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E97.B.2035/_p

Copy

@ARTICLE{e97-b_10_2035,
author={Nozomu ISHII, Lira HAMADA, Soichi WATANABE, },
journal={IEICE TRANSACTIONS on Communications},
title={A Novel SAR-Probe Calibration Method Using a Waveguide Aperture in Tissue-Equivalent Liquid},
year={2014},
volume={E97-B},
number={10},
pages={2035-2041},
abstract={A novel method for calibrating the probes used in standard measurement systems to evaluate SAR (specific absorption rate) of the radio equipment operating at frequencies over 3GHz is proposed. As for the proposed method, the electric-field distribution produced by a waveguide aperture installed in a liquid container is used to calibrate the SAR probe. The field distribution is shown to be the same as that given by a conventional calibration method by analytically deriving a closed-form expression for the field produced by the waveguide aperture with the help of the paraxial approximation. Comparing the approximated and measured distributions reveals that the closed-form expression is valid for the electric-field distribution near the central axis of the aperture. The calibration factor for a commercial SAR probe is evaluated by the proposed method and agrees well with that provided by the manufacturer of the probe.},
keywords={},
doi={10.1587/transcom.E97.B.2035},
ISSN={1745-1345},
month={October},}

Copy

TY - JOUR
TI - A Novel SAR-Probe Calibration Method Using a Waveguide Aperture in Tissue-Equivalent Liquid
T2 - IEICE TRANSACTIONS on Communications
SP - 2035
EP - 2041
AU - Nozomu ISHII
AU - Lira HAMADA
AU - Soichi WATANABE
PY - 2014
DO - 10.1587/transcom.E97.B.2035
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E97-B
IS - 10
JA - IEICE TRANSACTIONS on Communications
Y1 - October 2014
AB - A novel method for calibrating the probes used in standard measurement systems to evaluate SAR (specific absorption rate) of the radio equipment operating at frequencies over 3GHz is proposed. As for the proposed method, the electric-field distribution produced by a waveguide aperture installed in a liquid container is used to calibrate the SAR probe. The field distribution is shown to be the same as that given by a conventional calibration method by analytically deriving a closed-form expression for the field produced by the waveguide aperture with the help of the paraxial approximation. Comparing the approximated and measured distributions reveals that the closed-form expression is valid for the electric-field distribution near the central axis of the aperture. The calibration factor for a commercial SAR probe is evaluated by the proposed method and agrees well with that provided by the manufacturer of the probe.
ER -