MPE_calculate

FCC ID: O9YJL01

RF Exposure Info

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                                                                                            FCC ID: O9YJL01
                                                                                              IC: 22952-JL01


RF Exposure Evaluation
FCC Limits
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)
                        Electric field
Frequency range                            Magnetic field strength      Power density         Averaging time
                          strength                                                      2
      (MHz)                                             (A/m)             (mW/cm )              (minutes)
                           (V/m)
                              (A) Limits for Occupational/Controlled Exposures
     0.3–3.0                614                         1.63                *(100)                  6
                                                                                    2
      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
  1500–100,000                                                                5                     6
                          (B) Limits for General Population/Uncontrolled Exposure
     0.3–1.34               614                         1.63                *(100)                 30
                                                                                    2
     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
  1500–100,000                                                               1.0                   30
f = frequency in MHz
                                                    2
Friis transmission formula: Pd = (Pout*G)/(4*pi*r )


Where
                               2
Pd = power density in mW/cm , 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 id the limit of MPE, If we know the maximum gain of the antenna and the total power input to the antenna,
through the calculation, we will know the distance r where the MPE limit is reached.
Test Procedure
Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest
channel individually.


Test Result of RF Exposure Evaluation
WCDMA Band II

                                Output power to         Power Density at              Limit
          Channel                                                         2                   2         Result
                                 antenna (mW)          R=20cm (mW/cm )              (mW/cm )
   Lowest (1852.4MHz)               162.555                   0.05009                 1.0               PASS
   Middle (1880.0MHz)               164.059                   0.05055                 1.0               PASS
  Highest (1907.6MHz)               190.546                   0.05871                 1.0               PASS
Remark: antenna gain=1.9 dBi


WCDMA Band IV

                                Output power to         Power Density at              Limit
          Channel                                                         2                   2         Result
                                 antenna (mW)          R=20cm (mW/cm )              (mW/cm )
   Lowest (1712.4MHz)               146.893                   0.04850                 1.0               PASS
   Middle (1732.4MHz)               135.207                   0.04464                 1.0               PASS
  Highest (1752.6MHz)               127.938                   0.04224                 1.0               PASS
Remark: antenna gain=2.2dBi


WCDMA Band V

                                Output power to         Power Density at              Limit
          Channel                                                         2                   2         Result
                                 antenna (mW)          R=20cm (mW/cm )              (mW/cm )
   Lowest (826.4MHz)                162.930                   0.04794                0.549              PASS
    Middle (836.6MHz)               165.959                   0.04883                0.549              PASS
   Highest (846.6MHz)               163.305                   0.04805                0.549              PASS
Remark: antenna gain=1.7dBi


LTE mode

                                                                        Power
                  Frequency   Output power to     Output power
                                                                   Density at               Limit
   Band             (MHz)      antenna (dBm)       to antenna                                       2    Result
                                                                    R=20cm             (mW/cm )
                                                     (mW)                       2
                                                                   (mW/cm )

LTE Band 2          1880            23              199.526         0.04997                   1.0        PASS


LTE Band 4          1712.5         22.99            199.067         0.04986                   1.0        PASS

 LTE Band
                    699.7          22.99            199.067         0.04986                 0.47         PASS
     12

Remark: antenna gain
Band 2: 1.9dBi
Band 4: 2.2dBi
Band 12: 2.2dBi


IC Limits
Transmitters are exempt from routine SAR and RF exposure evaluations provided that they comply with the
requirements of sections 2.5.1 or 2.5.2.
2.5.1
SAR evaluation is required if the separation distance between the user and/or bystander and the antenna
and/or radiating element of the device is less than or equal to 20 cm, except when the device operates at or
below the applicable output power level (adjusted for tune-up tolerance) for the specified separation distance
defined in Table 1




2.5.2
RF exposure evaluation is required if the separation distance between the user and/or bystander and the
device’s radiating element is greater than 20 cm, except when the device operates as follows:
                6
• below 20 MHz and the source-based, time-averaged maximum e.i.r.p. of the device is equal to or less than
1 W (adjusted for tune-up tolerance);
• at or above 20 MHz and below 48 MHz and the source-based, time-averaged maximum e.i.r.p. of the device
                                  0.5
is equal to or less than 4.49/ƒ         W (adjusted for tune-up tolerance), where ƒ is in MHz;
• at or above 48 MHz and below 300 MHz and the source-based, time-averaged maximum e.i.r.p. of the
device is equal to or less than 0.6 W (adjusted for tune-up tolerance);
• at or above 300 MHz and below 6 GHz and the source-based, time-averaged maximum e.i.r.p. of the device
                                        -2   0.6834
is equal to or less than 1.31 x 10 ƒ                  W (adjusted for tune-up tolerance), where ƒ is in MHz;
• at or above 6 GHz and the source-based, time-averaged maximum e.i.r.p. of the device is equal to or less
than 5 W (adjusted for tune-up tolerance).


Test Result of RF Exposure Evaluation
According to RSS-102 RF exposure section 2.5.2 is calculated.
The minimum separation distance is 20cm declared by manufacturer


WCDMA Band II

                                     Output power to antenna
         Channel                                                         Limit (mW)         Result
                                (adjusted for tune-up tolerance mW)
   Lowest (1852.4MHz)                        204.644                          2240.99       PASS
   Middle (1880.0MHz)                        206.538                          2263.76       PASS
   Highest (1907.6MHz)                       239.883                          2286.42       PASS
Remark: antenna gain=1.9 dBi


WCDMA Band IV

                                     Output power to antenna
         Channel                                                         Limit (mW)         Result
                                (adjusted for tune-up tolerance mW)
   Lowest (1712.4MHz)                        184.927                          2123.82       PASS
   Middle (1732.4MHz)                        170.216                          2140.74       PASS
   Highest (1752.6MHz)                       161.065                          2157.76       PASS
Remark: antenna gain=2.2 dBi


WCDMA Band V

                                     Output power to antenna
         Channel                                                         Limit (mW)         Result
                                (adjusted for tune-up tolerance mW)
   Lowest (826.4MHz)                         205.116                          1290.86       PASS
    Middle (836.6MHz)                        208.930                          1301.73       PASS
   Highest (846.6MHz)                        205.589                          1312.34       PASS
Remark: antenna gain=1.7 dBi


LTE mode

                                              Output power to antenna               Limit
    Band           Frequency(MHz)                                                           Result
                                        (adjusted for tune-up tolerance mW)        (mW)

 LTE Band 2             1880                           251.189                    2287.16   PASS


 LTE Band 4            1712.5                          250.611                    2159.19   PASS


LTE Band 12             699.7                          250.611                    1160.85   PASS

Remark: antenna gain
Band 2: 1.9dBi, Band 4: 2.2dBi, Band 12: 2.2dBi



Document Created: 2018-10-26 17:32:46
Document Modified: 2018-10-26 17:32:46

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