RF Exposure

FCC ID: 2ANM3NTUDU8

RF Exposure Info

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                      INTERTEK TESTING SERVICES

                                  RF Exposure
The Equipment Under Test (EUT) is a WIFI module which has Bluetooth and WiFi
function, and WiFi operating at 2412-2462MHz for 802.11b/g/n-HT20, 11 channels
with 5MHz channel spacing; 2422-2452MHz for 802.11n-HT20, 7 channels with
5MHz channel spacing. The EUT was powered DC 3.3V. For more detailed features
description, please refer to the user’s manual.

Bluetooth Version: 2.1+EDR, 4.2, 5.0(Dual-mode)
Antenna Type: Integral antenna.
Antenna Gain: 3.1dBi.
Modulation Type: GFSK, /4-DQPSK and 8-DPSK
The nominal conducted output power specified: -0.1dBm (+/-3dB)
The nominal radiated output power (e.i.r.p) specified: 3.0dBm (+/- 3dB)

According to the KDB 447498:
    The maximun peak radiated emission for the EUT is 99.7dBμV/m at 3m in the
    frequency 2402MHz(BLE mode)
    The EIRP = [(FS*D) ^2 / 30] mW = 4.47dBm
    which is within the production variation.

     The minimum peak radiated emission for the EUT is 97.6dBμV/m at 3m in the
     frequency 2480MHz(EDR mode)
     The EIRP = [(FS*D) ^2 / 30] mW = 2.37dBm
     which is within the production variation.

According to FCC Part 2.1091, this unlicensed transmitting devices is categorically
excluded from routine environmental evaluation for RF exposure prior to equipment
authorization or use, According to the KDB 447498 and OET 65, the simple
calculation as below:

The maximun radiated output power specified is 6dBm = 3.98 mW

From above data, the exposed power density at a distance (R) of 20cm from the
center of radiation of the antenna for 2.4GHz band can be calculated according to
OET 65 as follow:
= 3.98mW/ 4πR^2
= 0.0008 mW/cm^2

The MPE limit is 1.0 mW/cm^2 for general population and uncontrolled exposure in
the Bluetooth frequency range according to FCC Part 1.1310. As the measured
power density at 20cm from the transmitter is lower than the MPE limit, the
compliance to the MPE limit can be ensured by indicating the minimum 20cm
separation between the transmitter's radiating structure and body of the user or
nearby persons.



FCC ID: 2ANM3NTUDU8


                      INTERTEK TESTING SERVICES

2.4GHz WiFi:
Antenna Type: Integral Antenna.
Antenna Gain: 3.1dBi.
Directional Gain: 6.1dBi
Modulation Type: BPSK, QPSK, 16QAM, 64QAM, CCK, DQPSK, DBPSK and DSSS,
OFDM.
The nominal conducted output power specified: 18dBm (Tolerance: +/-4dB).

According to the KDB 447498:
    The maximun conducted emission for the EUT is 21.29dBm in the frequency
    2437MHz(IEEE 802.11n-20, MIMO mode) which is within the production
    variation.

     The minimum conducted emission for the EUT is 14.56dBm in the frequency
     2462MHz(IEEE 802.11b, SISO mode) which is within the production variation.

According to FCC Part 2.1091, this unlicensed transmitting devices is categorically
excluded from routine environmental evaluation for RF exposure prior to equipment
authorization or use, According to the KDB 447498 and OET 65, the simple
calculation as below:

The source-based time averaged maximum radiated power in MIMO mode =
18+4+6.1= 28.1dBm = 645.65mW

From above data, the exposed power density at a distance (R) of 20cm from the
center of radiation of the antenna for 2.4GHz band can be calculated according to
OET 65 as follow:
= 645.65/ 4πR^2
= 0.129 mW/cm^2

The MPE limit is 1.0 mW/cm^2 for general population and uncontrolled exposure in
the Bluetooth frequency range according to FCC Part 1.1310. As the measured
power density at 20cm from the transmitter is lower than the MPE limit, the
compliance to the MPE limit can be ensured by indicating the minimum 20cm
separation between the transmitter's radiating structure and body of the user or
nearby persons.




FCC ID: 2ANM3NTUDU8


                       INTERTEK TESTING SERVICES

For Simultaneous transmitting of 2.4GHz WiFi and Bluetooth, According to
865664D02 2.2 d) 1):

The sum of the ratios of the spatially averaged results to the applicable frequency
dependent MPE limits = 0.0008mW/1mW + 0.129mW/1mW = 0.1298 < 1

Since the sum of the MPE ratios for all simultaneously transmitting antennas
incorporated in the device is ≤ 1.0, the EUT is considered to satisfy MPE
compliance for simultaneous transmission operations.

The following RF exposure statement or similar sentence is proposed to be
included in the user manual:

“FCC RF Radiation Exposure Statement Caution: This Transmitter must be
installed to provide a separation distance of at least 20 cm from all persons.”




FCC ID: 2ANM3NTUDU8



Document Created: 2019-06-02 20:47:18
Document Modified: 2019-06-02 20:47:18

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