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MPE

Moman Electronics (Shenzhen) Co., LTD M300 2BGA2-M300 2BGA2M300 m300

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Document DEVICE REPORTGetApplicationAttachment.html?id=7630876 
FCC ID:2BGA2-M300

RF Exposure Evaluation
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)

Frequency range (MHz)

Electric field strength (V/m)

Magnetic field strength (A/m)

Power density (mW/cm2)

Averaging time (minutes)

(A) Limits for Occupational/Controlled Exposures

0.3­3.0

614

1.63

*(100)

6

3.0­30

1842/f

4.89/f

*(900/f2)

6

30­300

61.4

0.163

1.0

6

300­1500

f/300

6

1500­100,000

5

6

(B) Limits for General Population/Uncontrolled Exposure

0.3­1.34

614

1.63

*(100)

30

1.34­30

824/f

2.19/f

*(180/f2)

30

30­300

27.5

0.073

0.2

30

300­1500

f/1500

30

1500­100,000

1.0

30

f = frequency in MHz 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 id the limit of MPE, 1 mW/cm2. 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

Modulat ion

Freque ncy MHz

Output power to antenna (dBm)

Target power W/toleran ce (dBm

Max Output power to antenna (dBm)

Max Output power to antenna (mW)

Power Density at R=20cm (mW/cm2)

Limit Result
(mW/cm2)

2402

-2.69

-2±1

-1

0.7943

0.000284

1.0

PASS

BLE GFSK 2440

-2.58

-2±1

-1

0.7943

0.000284

1.0

PASS

2480

-2.78

-2±1

-1

0.7943

0.000284

1.0

PASS

2412

15.91

16±1

17

50.1187

0.017936

1.0

PASS

802.11b 2437

16.80

16±1

17

50.1187

0.017936

1.0

PASS

2462

16.83

16±1

17

50.1187

0.017936

1.0

PASS

2412

19.86

20±1

21

125.8925

0.045054

1.0

PASS

802.11g 2437

20.50

20±1

21

125.8925

0.045054

1.0

PASS

2462

20.58

20±1

21

125.8925

0.045054

1.0

PASS

Wifi

2.4g

2412 802.11n

19.70

20±1

21

125.8925

0.045054

1.0

PASS

2437

20.36

20±1

21

125.8925

0.045054

1.0

PASS

(20)

2462

20.24

20±1

21

125.8925

0.045054

1.0

PASS

2422

20.63

20±1

21

125.8925

0.045054

1.0

PASS

802.11n

2437

20.44

20±1

21

125.8925

0.045054

1.0

PASS

(40)

2452

19.91

20±1

21

125.8925

0.045054

1.0

PASS

Modulati on

Freque ncy MHz

Output power to antenna (dBm)

Target power W/toleran ce (dBm

Max Output power to antenna (dBm)

5745

-1.75

-1±1

0

802.11a 5785

-0.72

-1±1

0

5825

-0.35

-1±1

0

5745

-1.32 -0.5±1

0.5

802.11

5785

-0.34 -0.5±1

0.5

n(20)

5825

0.04 -0.5±1

0.5

5745

-1.40 -0.5±1

0.5

Wifi 802.11

5.8g ac(20) 5785

-0.42 -0.5±1

0.5

5825

0.06 -0.5±1

0.5

802.11 5755

-1.74

-1±1

0

n(40)

5795

-1.19

-1±1

0

802.11 5755

-1.74

-1±1

0

ac(40) 5795

-1.08

-1±1

0

802.11

5775

-0.53

-1±1

0

ax(80)

Max Output power to antenna (mW)

Power Density at R=20cm (mW/cm2)

1.0000 1.0000 1.0000 1.1220 1.1220 1.1220 1.1220 1.1220 1.1220 1.0000 1.0000 1.0000 1.0000

0.000438 0.000438 0.000438 0.000492 0.000492 0.000492 0.000492 0.000492 0.000492 0.000438 0.000438 0.000438 0.000438

1.0000

0.000438

Limit (mW/cm2)
1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
1.0

Result
PASS PASS PASS PASS PASS PASS PASS PASS PASS PASS PASS PASS PASS
PASS

Modulation
802.11a
802.11n(20) Wifi 5.2g 802.11ac(20)
802.11n(40) 802.11ac(40) 802.11ac(80)

Frequency MHz

Output power to antenna (dBm)

Target power W/tolera nce (dBm

Max Output power to antenna (dBm)

Max Output power to antenna (mW)

5180

6.11

6±1

7

5.0119

5200

6.01

6±1

7

5.0119

5240

5.73

6±1

7

5.0119

5180

6.81

6±1

7

5.0119

5200

6.35

6±1

7

5.0119

5240

6.01

6±1

7

5.0119

5180

6.72

6±1

7

5.0119

5200

6.27

6±1

7

5.0119

5240

5.88

6±1

7

5.0119

5190

5.83

6±1

7

5.0119

5230

5.34

6±1

7

5.0119

5190

6.04

6±1

7

5.0119

5230

5.06

6±1

7

5.0119

5210

5.79

6±1

7

5.0119

Power Density at R=20cm (mW/cm2)
0.001798 0.001798 0.001798 0.001798 0.001798 0.001798 0.001798 0.001798 0.001798 0.001798 0.001798 0.001798 0.001798 0.001798

Limit (mW/c m2)

Result

1.0

PASS

1.0

PASS

1.0

PASS

1.0

PASS

1.0

PASS

1.0

PASS

1.0

PASS

1.0

PASS

1.0

PASS

1.0

PASS

1.0

PASS

1.0

PASS

1.0

PASS

1.0

PASS

Remark
1. BT/wifi2.4g Antenna gain is 2.55 dBi, wifi5.2g Antenna gain is 2.56 dBiwifi5.8g Antenna gain is 3.43 dBi 2. In the case of simultaneous launches for wifi and BT:
The Max Calc. Thresholds : BLE: 0.000284, Wifi2.4g: 0.045054, Wifi5g:0.001798
BT and Wifi: 0.000284+0.045054+0.001798 = 0.047136  1
So a SAR test is not required

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