RF EXPOSURE EVALUATION

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RF Exposure

SHENZHEN ELECTRON TECHNOLOGY CO.,LTD. E0087 Digital Calendar 2ABC5-E0087 2ABC5E0087 e0087

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RF EXPOSURE EVALUATION

According to FCC 1.1310: 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 KDB 447498 D01 V06 and §1.1307(b) CFR Title 47 §2.1091(b): (b) For purposes of this section, a mobile device is defined as a transmitting device designed to be used in other than fixed locations and to generally be used in such a way that a separation distance of at least 20 centimeters is normally maintained between the transmitter's radiating structure(s) and the body of the user or nearby persons.

FCC ID: 2ABC5-E0087

EUT Specification

EUT Frequency band (Operating)
Device category Exposure classification Antenna diversity
Evaluation applied

Digital Calendar WLAN: 2.412GHz ~ 2.462GHz WLAN: 5.18GHz ~ 5.24GHz WLAN: 5.745GHz ~ 5.825GHz Others: 2.402GHz~2.480GHz BT NFC: 13.56MHz RFID: 125kHz Portable (<20cm separation) Mobile (>20cm separation) Others ___ Occupational/Controlled exposure (S = 5mW/cm2) General Population/Uncontrolled exposure (S=1mW/cm2) Single antenna Multiple antennas Tx diversity Rx diversity Tx/Rx diversity MPE Evaluation SAR Evaluation

Limits for Maximum Permissible Exposure(MPE)
Note: Emissions between 100 kHz to 300 kHz should be assessed versus the limits at 300 kHz in Table 1 of Section 1.1310: 614 V/m and 1.63 A/m.AKDB inquiry is required to determine the applicable exposure limits below 100 kHz.
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 the limit of MPE, 1mW/cm2. If we know the maximum gain of the antenna and total power input to the antenna, through the calculation, we will know the distance where the MPE limit is reached.

Measurement Result

BT worst case:

Channel Measured Tune up Max. Tune Operating Frequency Power tolerance up Power
Mode (MHz) (dBm) (dBm) (dBm)

8DPSK 2480

-0.34 -0.34±1

0.66

Antenna Gain (dBi) 1.91

Power density

at 20cm

Power density

Limits (mW/cm2 )

(mW/ cm2 )

0.0004

1

BLE worst case:

Channel Measured Tune up Max. Tune Operating Frequency Power tolerance up Power
Mode (MHz) (dBm) (dBm) (dBm)

1M

2402

-7.26 -7.26±1 -6.26

Antenna Gain (dBi) 1.91

Power density

at 20cm

Power density

Limits (mW/cm2 )

(mW/ cm2 )

0.0001

1

2.4GHz WiFi worst case: Channel Measured Tune up Max. Tune
Operating Frequency Power tolerance up Power Mode (MHz) (dBm) (dBm) (dBm)

802.11g 2462

14.49 14.49±1 15.49

Antenna Gain (dBi)

Power density

at 20cm

Power density

Limits (mW/cm2 )

(mW/ cm2 )

1.91

0.0109

1

5.1GHz WiFi worst case:

Channel Measured Tune up Max. Tune Operating Frequency Power tolerance up Power
Mode (MHz) (dBm) (dBm) (dBm)

802.11n (HT20)

5240

16.69 16.69±1 17.69

Antenna Gain (dBi)

Power density

at 20cm

Power density

Limits (mW/cm2 )

(mW/ cm2 )

2.60

0.0213

1

5.8GHz WiFi worst case:

Channel Measured Tune up Max. Tune Operating Frequency Power tolerance up Power
Mode (MHz) (dBm) (dBm) (dBm)

Antenna Gain (dBi)

Power density

at 20cm

Power density

Limits (mW/cm2 )

(mW/ cm2 )

802.11ax

5825

16.15 16.15±1 17.15

2.51

0.0184

1

(HEW40)

Evaluate the condition of different modules work simultaneously

The requirement of Simultaneous Transmission evaluation has also been considered and has

complied with the following conditions of the worst case:

MPE1/Limit1 + MPE2/Limit2 +......  1

Thus,

0.0004/1 + 0.0109/1 + 0.0213/1 + 0.0184/1

(BT/BLE) (2.4G WiFi) (5.1G WiFi) (5.8G WiFi)

= 0.0510  1

It is concluded that no Simultaneous Transmission evaluation is required.

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