MPE

FCC ID: KA2DIR615G1

RF Exposure Info

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FCCID_1214647

Compliance Certification Services Inc. FCC ID ：KA2DIR615G1 Report No.：90619302-RP1 Page 55 of 143 8.4 MAXIMUM PERMISSIBLE EXPOSURE According to FCC 1.1310 : The criteria listed in the following table shall be used to evaluate theenvironment impact of human exposure to radio frequency (RF) radiation as specified in 1.1307(b)LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) Frequency Range Electric Field Magnetic Field Power Density Average Time (MHz) Strength (V/m) Strength (A/m) (mW/cm2) (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

Compliance Certification Services Inc. FCC ID ：KA2DIR615G1 Report No.：90619302-RP1 Page 56 of 143 LIMIT Power Density Limit, S=1.0mW/cm2 TEST RESULTS Minimum Numeric Power Power Antenna Output separation antenna Density Density Mode Gain Power distance gain Limit at 20cm (dBi) (dBm) (cm) (dB) (mW/cm2) (mW/cm2) IEEE 802.11b 1.8 20.0 23.47 1.51 1.00 0.066945 IEEE 802.11g 1.8 20.0 21.29 1.51 1.00 0.040525 IEEE 802.11n HT20 1.8 20.0 23.22 1.51 1.00 0.063200 IEEE 802.11n HT40 1.8 20.0 22.76 1.51 1.00 0.056849 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.


Document Created: 2009-09-08 21:42:03
Document Modified: 2009-09-08 21:42:03
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