RF exposure info

FCC ID: KA2IR640LA1

RF Exposure Info

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FCCID_1790365

Reference No.: T120810N92-RP1 FCC ID：KA2IR640LA1 Report No.：T120810N92-RP1 8.3 MAXIMUM PERMISSIBLE EXPOSURE 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)LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) Frequency Electric Field Magnetic Field Power Density Average Range Strength (V/m) Strength (A/m) (mW/cm2) Time (MHz) (A) Limits for Occupational / Control Exposures 300-1,500 -- -- F/300 6 1,500-100,000 -- -- 5 6 (B) Limits for General Population / Uncontrol Exposures 300-1,500 -- -- F/1500 6 1,500-100,000 -- -- 1 30 CALCULATIONS 30 × P × G E2 Given E= & S= d 3770 Where E = Field strength in Volts / meter P = Power in Watts G = Numeric antenna gain d = Distance in meters S = Power density in milliwatts / square centimeter Combining equations and re-arranging the terms to express the distance as a function of the remaining variables yields: 30 × P × G S= 3770d 2 Changing to units of mW and cm, using: P (mW) = P (W) / 1000 and d (cm) = d(m) / 100 Yields 30 × (P / 1000 ) × G P×G S= = 0.0796 × 3770 × (d / 100) 2 d2 Where d = Distance in cm P = Power in mW G = Numeric antenna gain S = Power density in mW / cm2 Page 56 / 138

Reference No.: T120810N92-RP1 FCC ID：KA2IR640LA1 Report No.：T120810N92-RP1 LIMIT Power Density Limit, S=1.0mW/cm2 TEST RESULTS No non-compliance noted. 30 × (P / 1000 ) × G P×G S= = 0.0796 × 3770 × (d / 100) 2 d2 Numeric antenna gain : Once Antenna Gain=2.0dBi=1.584893 Total Antenna Gain=5.01dBi=3.169786 IEEE 802.11b = 0.0796 * 220.2926 * 1.58489319 ÷ 400 = 0.06948 IEEE 802.11g = 0.0796 * 120.5036 * 1.58489319 ÷ 400 = 0.03801 IEEE 802.11n HT20 = 0.0796 * 193.6501 * 3.16978638 ÷ 400 = 0.12215 IEEE 802.11n HT40 = 0.0796 * 74.3939 * 3.16978638 ÷ 400 = 0.04693 Minimum Power Power Output Output Antenna separation Density Density Mode Power Power Gain distance Limit at 20cm (dBm) (mW) (dBi) (cm) (mW/cm2) (mW/cm2) IEEE 802.11b 20 23.43 220.29 2.00 1.00 0.069479 IEEE 802.11g 20 20.81 120.50 2.00 1.00 0.038006 IEEE 802.11n HT20 20 22.87 193.65 5.01 1.00 0.122152 IEEE 802.11n HT40 20 18.72 74.39 5.01 1.00 0.046927 REMARK: For mobile or fixed location transmitters, the maximum power density is 1.0 mW/cm2 even if the calculation indicates that the power density would be larger. Page 57 / 138


Document Created: 2012-09-13 15:12:32
Document Modified: 2012-09-13 15:12:32
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