RF Exposure Evaluation_Rev1

FCC ID: S8J-WA730RE

RF Exposure Info

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FCCID_2553216

RF EXPOSURE EVALUATION EUT Specification EUT 300Mbps Universal WiFi Range Extender FCC ID S8J-WA730RE Frequency band WLAN: 2.412GHz ~ 2.462GHz (Operating) WLAN: 5.18GHz ~ 5.32GHz / 5.50GHz ~ 5.70GHz WLAN: 5.745GHz ~ 5825GHz Others 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 21.43dBm for 802.11b; 20.46dBm for 802.11g; 20.10dBm for 802.11n(HT20); 19.61dBm for 802.11n(HT40); Antenna gain (Max) 2.0dBi ( for per antenna port Max) 5.01dBi for MIMO(Ant3+Ant4 Directional Gain) Evaluation applied MPE Evaluation SAR Evaluation 1

Applicable Standard: 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 levels in excess limit for maximum permissible exposure. In accordance with 47 CFR FCC Part 2 Subpart J. Section 2.1091 this device has been defined as a mobile device whereby a distance of 0.2m Normally can be maintained between the user and the device. 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 0.3-3.0 614 1.63 (100)* 6 3.0-30 1842/f 4.89/f (900/f)* 6 30-300 61.4 0.163 1.0 6 300-1500 -- -- F/300 6 1500-100000 -- -- 5 6 (B) Limits for General Population/Uncontrol Exposures 0.3-1.34 614 1.63 (100)* 30 1.34-30 824/f 2.19/f (180/f)* 30 30-300 27.5 0.073 0.2 30 300-1500 -- -- F/1500 30 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. 2

Measurement Result Max power Result: Operation Channel Channel Measurement Level Limit Mode Number Frequency (dBm) (dBm) Verdict (MHz) Ant3 Ant4 Sum 1 2412 19.33 19.23 -- 30 PASS 802.11b 6 2437 20.13 20.24 -- 30 PASS 11 2462 21.43 20.75 -- 30 PASS 1 2412 18.75 19.11 -- 30 PASS 802.11g 6 2437 19.03 19.42 -- 30 PASS 11 2462 20.42 20.46 -- 30 PASS 1 2412 16.02 16.17 19.11 30 PASS 802.11n 6 2437 16.25 16.29 19.28 30 PASS (HT20) 11 2462 17.12 17.05 20.10 30 PASS 3 2422 14.48 14.23 17.37 30 PASS 802.11n 6 2437 15.13 15.02 18.09 30 PASS (HT40) 9 2452 16.75 16.45 19.61 30 PASS Antenna 3: Tune up Power Output Power tolerance Max tune up Ant. density at Operating Test Peak Ant. Gain density (dBm) conducted Gain 20cm Mode Channel power (numeric) Limits power(dBm) (dBi) (mW/ (mW) (mW/cm2 ) cm2 ) 1 19±1 20 100.000 2 1.585 0.031530 1 802.11b 6 20±1 21 125.893 2 1.585 0.039694 1 11 21±1 22 158.489 2 1.585 0.049972 1 1 19±1 20 100.000 2 1.585 0.031530 1 802.11g 6 19±1 20 100.000 2 1.585 0.031530 1 11 20±1 21 125.893 2 1.585 0.039694 1 1 16±1 17 50.119 2 1.585 0.015803 1 802.11n 6 16±1 17 50.119 2 1.585 0.015803 1 (H20) 11 17±1 18 63.096 2 1.585 0.019894 1 3 14±1 15 31.623 2 1.585 0.009971 1 802.11n 6 15±1 16 39.811 2 1.585 0.012552 1 (H40) 9 17±1 18 63.096 2 1.585 0.019894 1 3

Antenna 4: Tune up Power Output Power tolerance Max tune up Ant. density at Operating Test Peak Ant. Gain density (dBm) conducted Gain 20cm Mode Channel power (numeric) Limits power(dBm) (dBi) (mW/ (mW) (mW/cm2 ) cm2 ) 1 19±1 20 100.000 2 1.585 0.031530 1 802.11b 6 20±1 21 125.893 2 1.585 0.039694 1 11 21±1 22 158.489 2 1.585 0.049972 1 1 19±1 20 100.000 2 1.585 0.031530 1 802.11g 6 19±1 20 100.000 2 1.585 0.031530 1 11 20±1 21 125.893 2 1.585 0.039694 1 1 16±1 17 50.119 2 1.585 0.015803 1 802.11n 6 16±1 17 50.119 2 1.585 0.015803 1 (H20) 11 17±1 18 63.096 2 1.585 0.019894 1 3 14±1 15 31.623 2 1.585 0.009971 1 802.11n 6 15±1 16 39.811 2 1.585 0.012552 1 (H40) 9 16±1 17 50.119 2 1.585 0.015803 1 MPE Result: Operation Channel Channel Power density at 20cm (mW/ cm2 ) Power Mode Number Frequency Ant3 Ant4 Sum density Verdict (MHz) Limits (mW/cm2 ) 1 2412 0.031530 0.031530 -- 1 PASS 802.11b 6 2437 0.039694 0.039694 -- 1 PASS 11 2462 0.049972 0.049972 -- 1 PASS 1 2412 0.031530 0.031530 -- 1 PASS 802.11g 6 2437 0.031530 0.031530 -- 1 PASS 11 2462 0.039694 0.039694 -- 1 PASS 1 2412 0.015803 0.015803 0.031606 1 PASS 802.11n 6 2437 0.015803 0.015803 0.031606 1 PASS (HT20) 11 2462 0.019894 0.019894 0.039788 1 PASS 3 2422 0.009971 0.009971 0.019942 1 PASS 802.11n 6 2437 0.012552 0.012552 0.025104 1 PASS (HT40) 9 2452 0.019894 0.015803 0.035697 1 PASS 4


Document Created: 2015-03-11 17:00:57
Document Modified: 2015-03-11 17:00:57
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