18_H5040 RFExp r2

FCC ID: 2AQA6-H5040

RF Exposure Info

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FCCID_4499066

RF EXPOSURE EVALUATION

According to FCC 1.1310: The criteria listed in the following table shall be used to
evaluate the environment impact of human exposure to radio frequency(RF) Radiation
as specified in §1.1307(b)

FCC ID: 2AQA6-H5040

EUT Specification
EUT WIFI Gateway
Frequency band (Operating) WLAN: 2.412GHz ~ 2.462GHz
WLAN: 5.18GHz ~ 5.32GHz / 5.50GHz ~ 5.70GHz
WLAN: 5.745GHz ~ 5825GHz
Others: 433.92MHz
Device category Portable (<20cm separation)
Mobile (>20cm separation)
Others ___
Exposure classification Occupational/Controlled exposure (S = 5mW/cm2)
General Population/Uncontrolled exposure (S=1mW/cm2)
Antenna diversity Single antenna
Multiple antennas
Tx diversity
Rx diversity
Tx/Rx diversity
Max. output power WIFI: 16.29 dBm (0.0426W); 433.92: -15.5dBm(0.000028W)
Antenna gain (Max) WIFI: 2 dBi; 433.92MHz: 0 dBi
Evaluation applied MPE Evaluation
SAR Evaluation

Limits for Maximum Permissible Exposure(MPE)

Frequency Electric Field Magnetic Field Power Average
Range(MHz) Strength(V/m) Strength(A/m) Density(mW/cm2) Time
(A) Limits for Occupational/Control Exposures
300-1500 -- -- F/300 6
1500-100000 -- -- 5 6
(B) Limits for General Population/Uncontrol Exposures
300-1500 -- -- F/1500 6
1500-100000 -- -- 1 30

$Friis transmission formula: Pd=(Pout*G)\(4*pi*R2) Where Pd= Power density in mW/cm2 Pout=output power to antenna in Mw G= gain of antenna in linear scale Pi=3.1416 R= distance between observation point and center of the radiator in cm Pd the limit of MPE, 1mW/cm2. If we know the maximum gain of the antenna and total power input to the antenna, through the calculation, we will know the distance where the MPE limit is reached. Measurement Result 2.4G WiFi Channel Measured Tune up Max. Tune Antenna Power density Power density Operating Frequency Power tolerance up Power Gain at 20cm Limits Mode 2 (MHz) (dBm) (dBm) (dBm) (dBi) (mW/ cm ) (mW/cm2 ) 2412 15.13 15.13±1 16.13 2 0.0129 1 802.11b 2437 15.14 15.14±1 16.14 2 0.0130 1 2462 14.82 14.82±1 15.82 2 0.0120 1 2412 14.41 14.41±1 15.41 2 0.0110 1 802.11g 2437 16.24 16.24±1 17.24 2 0.0167 1 2462 15.86 15.86±1 16.86 2 0.0153 1 2412 14.23 14.23±1 15.23 2 0.0105 1 802.11n 2437 16.29 16.29±1 17.29 2 0.0169 1 (HT20) 2462 15.70 15.70±1 16.70 2 0.0147 1$

433.92MHz：

Channel Antenna Max Output Max Output Power Power Power
Frequency Gain power power Included density at density
(MHz) (dBi) (dBuV/m) (dBm) Tune-up(dBm) 20cm(mW/ Limits
cm2) (mW/cm2)
433.92 0 79.75 -15.5 -14.5 0.71e-5 1

MPE Calculation Method
P = Peak RF output power (W)
G = EUT Antenna numeric gain (numeric)
R = Separation distance between radiator and human body (m)=0.2m
The formula can be changed to
Pd =Pout*G/(4*Pi*R2)

EIRP=E-104.8+20logD=79.75-104.8+20log3=-15.5dBm

WiFi+433.92MHz（worst case）：
0.0169+0.71e-5=0.01691<1

The SAR measurement is not necessary.

Document Created: 0680-11-02 00:00:00
Document Modified: 0680-11-02 00:00:00