2.4G MPE report

FCC ID: LDK102089P

RF Exposure Info

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FCCID_2396182

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                Maximum Permissible Exposure (MPE) Calculations
                                     For AIR—CAP1532E—A—K9
                                           2.4GHz Band

15.247; U—NIl devices are subject to the radio frequency radiation exposure requirements specified in
        Sec. 1.1307(b), Sec. 2.1091 and Sec. 2.1093 of this chapter, as appropriate. All equipment shall
        be considered to operate in a general population/uncontrolled" environment. Applications for
        equipment authorization of devices operating under this section must contain a statement
        confirming compliance with these requirements for both fundamental emissions and unwanted
        emissions. Technical information showing the basis for this statement must be submitted to the
        Commission upon request.

        Given
                E=V(30*P*G)Y/d and      S=EA2/3770
        where
                E=Field Strength in Volts/meter
                P=Power in Watts
                G=Numeric Antenna Gain
                d=Distance in meters
                S=Power Density in mW/cm*A2

        Combine equations and rearrange the terms to express the distance as a function of the
        remaining variables:
                d=V/((30*P*G)/(3770*S))

        Changing to units of power in mW and distance in cm, using:
               P(mW)=P(W)/1000                 d(cm)=100*d(m)
        yields
               d=100*/((30*(P/1000)*G)/(3770*8))
                d=0.282*~(P*G/S)
        where
                d=Distance in cm
                P=Power in mW
                G=Numerica Antenna Gain
                S=Power Density in mW/emA2

        Substituting the logarithmic form of power and gain using:
                 P(mW)=104M(P(dBm)/10)           G(numeric)=104(G{dBi)/10)
        yields
                d=0.282*104((P+G)/20)WNS                                                 Equation (1)
        and
                s=((0.282*104((P+G)/20))/d)42                                            Equation (2)
        where
                d=MPE distance in cm
                P=Power in dBm
                G=Antenna Gain in dBi


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                 S=Power Density in mW/cm*42

        Equation (1) and the measured peak power are used to calculate the MPE distance. Note that for
        mobile or fixed location transmitters such as an access point, the minimum separation distance is
        20 cm even if the calculations indicate that the MPE distance may be less.

        S=1mW/em*A2 maximum. The highest supported antenna gain is 13 dBi. Using the peak power
        levels recorded in the test report along with Equation 1 above, the MPE distances are calculated
        as follows.

                                                 Peak
                                    Power      Transmit| Antenna|        MPE
         Frequency |Bit Rate| Density            Power      Gain     Distance| Limit] Margin
           (MHz)    (Mbps) (mW/cm*2)|            (dBm)      (dBi)      (cm)    |(cm)| (cm)
            2412       11        1                22.7        13       17.19     40    22.81
            2437       11        1                26.9        13       27.88     40    12.12
            2462       11        1                19.4        13       11.76     40    28.24
            2412       54        1                13.5        13        5.96     40    34.04
            2437       54        1                26.4        13       26.32     40    13.68
            2462       54        1                13.1        13        5.69     40    34.31
        MPE Calculations


To maintain compliance, installations will assure a separation distance of at least 20cm.

Using Equation 2, the MPE levels (s) at 20 ocm are calculated as follows:

                                          Peak
                             MPE    Transmit| Antenna    Power
     Frequency    Bit Rate Distance| Power      Gain    Density    Limit    Margin
       (MHz)       (Mbps)    (cm)     (dBm)     (dBi) (mW/em*2) (mW/em*2) (mW/em*2)
        2412         11       40       22.7       13      0.18       1       0.82
        2437         11       40       26.9       13      0.49       1       0.51
        2462         11       40       19.4       13      0.09       1       0.91
        2412         54       40       13.5       13      0.02       1       0.98
        2437         54       40       26.4       13      0.43       1       0.57
        2462         54       40       13.1       13      0.02       1       0.98




Test Enginger:       W/
Date: //ZZ/Z 1.3



Document Created: 2019-11-16 12:29:40
Document Modified: 2019-11-16 12:29:40

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