RF Exposure

FCC ID: SS3-WM334R1801

RF Exposure Info

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FCCID_3810576

Bay Area Compliance Laboratories Corp. (Dongguan)                           Report No.: RDG180118004-00C

FCC §15.407 (f) & §1.1310 & §2.1091- MAXIMUM PERMISSIBLE
EXPOSURE (MPE)
Applicable Standard
According to subpart 15.407(f)and subpart §1.1310, systems operating under the provisions of this
section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy
level in excess of the Commission’s guidelines.

Limits for Maximum Permissible Exposure (MPE) (§1.1310, §2.1091)

                         (B) Limits for General Population/Uncontrolled Exposure
Frequency Range        Electric Field       Magnetic Field        Power Density               Averaging Time
     (MHz)            Strength (V/m)        Strength (A/m)           (mW/cm2)                   (minutes)
    0.3–1.34                614                   1.63                 *(100)                       30
    1.34–30                824/f                 2.19/f               *(180/f²)                     30
    30–300                 27.5                  0.073                   0.2                        30
   300–1500                  /                      /                  f/1500                       30
 1500–100,000                /                      /                    1.0                        30

f = frequency in MHz; * = Plane-wave equivalent power density;

According to §1.1310 and §2.1091 RF exposure is calculated.


Calculation formula:

Prediction of power density at the distance of the applicable MPE limit
S = PG/4R² = power density (in appropriate units, e.g. mW/cm2);
P = power input to the antenna (in appropriate units, e.g., mW);
G = power gain of the antenna in the direction of interest relative to an isotropic radiator, the power gain
factor, is normally numeric gain;
R = distance to the center of radiation of the antenna (appropriate units, e.g., cm);


Calculated Data:

                                             Max. Target Power
                                                                     Evaluation      Power        MPE
       Frequency         Antenna Gain             including
                                                                      Distance      Density       Limit
         Band                                    Tolerance
                                                                       (cm)         (W/m2)       (W/m2)
                      (dBi)    (numeric)     (dBm)       (mW)
     2.4GHz Band        3         2.00         28        630.96         20.00         0.25         1.0
     5.8GHz Band        3         2.00         23        199.53         20.00         0.08         1.0

Note: the Max. Target Power including Tolerance was declared by manufacturer.
      The 2.4GHz band and 5.8GHz band can`t transmit simultaneously

Result: Compliance, The device meets MPE requirement for Devices Used by the General Public
(Uncontrolled Environment) at distance ≥20 cm.




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Document Created: 2019-10-14 00:30:13
Document Modified: 2019-10-14 00:30:13

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