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A technique of measuring the gain of the antenna in the tissue equivalent liquid is required to develop alternative method for calibrating SAR probe with no use of the waveguide system. It is based on an extended Friis transmission formula which is valid in the near-field region of the antenna in the liquid, because the attenuation in the liquid is so large that the measurement in the far-field region...
The SAR-probe is usually calibrated using a rectangular waveguide with a matching dielectric spacer below 3 GHz. However, the probe diameter is comparable with the cross-section area of the waveguide above 3 GHz and it can deteriorate the accuracy of the calibration. Therefore, there is an alternative method for calibrating the SAR-probe; relating the output voltage of the probe to the field intensity...
To evaluate the values of the SAR (Specific Absorption Rate) for the mobile communication devices, electric-field probes should be calibrated to relate the field intensity in the tissue equivalent liquid to its output voltages. As a conventional method for 300 MHz-3 GHz, it can be calibrated in the liquid surrounded by the waveguide and the dielectric spacer. Above 3 GHz, the effect of the probe cannot...
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