SAR Calculation
2D/3D Field Post Processing  SAR Calculation
Use this dialog to calculate whole-body averaged and local Specific
Absorption Rates (SAR) based on results of a power-loss density
monitor.
Label
The name of the SAR results in the .
Switch off the automatic labeling
to manually define different labels for different settings made in the
SAR special settings dialog box.
Powerloss density frame
Monitor:
Select here the power-loss density monitor to be used for the SAR calculation
Frequency:
Shows the frequency of the selected monitor:
Averaging mass / Point SAR frame
For the local SAR calculation, specify the mass
in gram over which the SAR should be averaged or choose Point SAR. Typical
values are 1 g or 10 g. Use the "custom" option to define any
other value.
Calculate
Calculates local and whole-body averaged SAR. The
local SAR is added to the 2D/3D Results in the navigation tree. The whole
body averaged SAR and other values will be written to the SAR results
file and can be accessed via the View
results... button.
Specials...
Opens the SAR special settings
dialog box.
View results...
Opens the SAR result file for the selected power
loss density monitor and averaging mass or the manually set label respectively.
This result file can also be viewed by clicking Edit->Info while the
SAR field result is selected in the navigation tree. For detailed explanation
of the result data, see the SAR
Calculation Overview.
Close
Leaves the dialog.
Help
Shows this help text.
SAR Special Settings
Dialog Box
Reference Power
The default stimulation power is 1W peak power.
Set a user defined power to rescale
the results to any RMS power. You may also define
accepted power as reference to set directly the power flowing into
the structure. Reflection losses at the feeding point thus do not affect
the SAR calculation. (The accepted power is equal to the radiated power
of an antenna without ohmic losses.). System power values are used if
the SAR result has been generated by a circuit simulation.
The proper scaling to a user defined accepted power
requires the balance of the excitation. Choose use
AR filter results if available to use improved balance values from
an AR filter calculation. See the AR-Filter
Overview for details.
Averaging method
There are several methods to define an averaging
volume which contains the desired averaging mass. The IEEE
C95.3 method uses a cube which is grown around the specific point
P until it contains the required mass. The cubes are always aligned to
the xyz coordinate system. However, if one face of the cube is completely
in air, the volume is regarded as invalid and the SAR is taken from the
point with the maximum SAR whichs averaging volume contains the point
P.
A modification of this method which is called CST C95.3 takes for invalid averaging
volumes not the maximum but the closest valid SAR.
IEEE/IEC 62704-1
is an averaging method according to the current dual logo standard draft
IEEE/IEC 62704-1 "Draft Recommended Practice for Determining the
Peak Spatial-Average Specific Absorption Rate (SAR) in the Human Body
from Wireless Communications Devices, 30 MHz - 6 GHz: General Requirements
for using the Finite Difference Time Domain (FDTD) Method for SAR Calculations"
(Formerly known as IEEE P1528.1). Compared to the IEEE C95.3 method it
uses an additional criterion that limits the air volume in valid averaging
cubes to 10%.
The CST Legacy
method does not take into account the face in air condition but just grows
the cube further until the required mass is reached. (Equivalent to CST
MWS 2006 and previous versions)
The Constant volume
method uses for all points an averaging volume of the same size, defined
by averaging mass multiplied with the ratio of total volume to total mass.
Subvolume
You can define a subvolume to be additionally evaluated
in the SAR result file by "Use subvolume
for statistics" or to save SAR calculation time if you calculate SAR in subvolume only. In
the latter case, the SAR field plot will only show nonzero values in the
subvolume and there will be no statistics for the total volume in the
SAR result file.
To define the XYZmin
and XYZmax points you may also
use picks before
opening the dialog (i.e., two diagonal picked points).
See also
SAR
Calculation Overview , Import
Voxel Data , Monitors
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