RF exposure

FCC ID: S8J-R8188EU1F

RF Exposure Info

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FCCID_2866661

RF EXPOSURE EVALUATION EUT Specification EUT 150Mbps Wireless N USB Module FCC ID S8J-R8188EU1F 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 Antenna gain (Max) 2.0dBi 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: Max Output Power (dBm) Test Limit 802.11n 802.11n Result Channel 802.11b 802.11g (dBm) (HT20) (HT40) Lowest 13.25 12.40 11.22 9.52 Middle 14.46 13.05 12.62 10.46 30 Pass Highest 15.66 14.35 13.44 11.05 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 13±1 14 25.12 2 1.585 0.007921 1 802.11b 6 14±1 15 31.62 2 1.585 0.009971 1 11 16±1 17 50.12 2 1.585 0.015804 1 1 12±1 13 19.95 2 1.585 0.006292 1 802.11g 6 13±1 14 25.12 2 1.585 0.007921 1 11 14±1 15 31.62 2 1.585 0.009971 1 1 11±1 12 15.85 2 1.585 0.004998 1 802.11n 6 13±1 14 25.12 2 1.585 0.007921 1 (H20) 11 13±1 14 25.12 2 1.585 0.007921 1 3 10±1 11 12.59 2 1.585 0.003970 1 802.11n 6 10±1 11 12.59 2 1.585 0.003970 1 (H40) 9 11±1 12 15.85 2 1.585 0.004998 1 3


Document Created: 2016-01-05 13:55:20
Document Modified: 2016-01-05 13:55:20
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