03 FCC SAR Report-2

FCC ID: W2Z-02000004

Test Report

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Test report No. : 11884511S-A
Page : 15 of 48
Issued date : September 1, 2017

FCC ID : W2Z-02000004

APPENDIX 2: SAR Measurement data
Appendix 2-1: Evaluation procedure

The SAR evaluation was performed with the following procedure:
Step 1: Measurement of the E-field at a fixed location above the central position of flat phantom was used as a reference value
for assessing the power drop.
Step 2: The SAR distribution at the exposed side of head or body position was measured at a distance of each device from the
inner surface of the shell. The area covered the entire dimension of the antenna of EUT and suitable horizontal grid
spacing of EUT. Based on these data, the area of the maximum absorption was determined by splines interpolation.
Step 3: Around this point found in the Step 2 (area scan), a volume of more than or equal to 30mm(X axis)30mm(Y
axis)30mm(Z axis) was assessed by measuring 777 points (or more) under 3GHz and a volume of more than or
equal to 28mm(X axis)28mm(Y axis)24mm (Z axis) was assessed by measuring 887 (ratio step method (*1))
points (or more) for 3-6GHz frequency band.
Any additional peaks found in the Step2 which are within 2dB of limit are repeated with this Step3 (Zoom scan).
On the basis of this data set, the spatial peak SAR value was evaluated under the following procedure:
(1) The data at the surface were extrapolated, since the center of the dipoles is 1mm away from the tip of the probe
and the distance between the surface and the lowest measuring point is 2mm. The extrapolation was based on a
least square algorithm. A polynomial of the fourth order was calculated through the points in z-axes. This
polynomial was then used to evaluate the points between the surface and the probe tip.
(2) The maximum interpolated value was searched with a straightforward algorithm. Around this maximum the
SAR values averaged over the spatial volumes (1g or 10g) were computed by the 3D-Spline interpolation
algorithm. The 3D-Spline is composed of three one-dimensional splines with the “Not a knot"-condition (in x, y
and z-directions). The volume was integrated with the trapezoidal-algorithm. One thousand points (101010)
were interpolated to calculate the average.
(3) All neighboring volumes were evaluated until no neighboring volume with a higher average value was found.
Step 4: Re-measurement of the E-field at the same location as in Step 1 for the assessment of the power drift.
Step 5: Repeat Step 1-Step 4 with other condition or/and setup of EUT.

*1. Ratio step method parameters used; the first measurement point: “1.4mm” from the phantom surface, the initial grid separation: “1.4mm”, subsequent graded grid
ratio: “1.4”. These parameters comply with the requirement of the KDB 865664 D01 (v01r04) and recommended by Schmid & Partner Engineering AG (DASY5
manual).

UL Japan, Inc.
Shonan EMC Lab.
1-22-3 Megumigaoka, Hiratsuka-shi, Kanagawa-ken, 259-1220 JAPAN
Telephone: +81 463 50 6400 / Facsimile: +81 463 50 6401

Document Created: 2017-09-01 17:19:19
Document Modified: 2017-09-01 17:19:19

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