RF EXPOSURE EVALUATION

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MPE

Shenzhen Interthings Technology Co., Ltd. IPB215 Smart Video Doorbell 2AQ7B-IPB215 2AQ7BIPB215 ipb215

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Document DEVICE REPORTGetApplicationAttachment.html?id=8365085 
RF EXPOSURE EVALUATION
KDB 447498 D01 Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies v06.
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 §1.1307(b)

EUT Specification

FCC ID EUT Frequency band (Operating)
Device category Exposure classification Antenna diversity
Antenna gain (Max) Evaluation applied

2AQ7B-IPB215 Smart Video Doorbell
BT: 2.402GHz ~ 2.480GHz WLAN: 2.412GHz ~ 2.462GHz RLAN: 5.180GHz ~ 5.240GHz RLAN: 5.260GHz ~ 5.320GHz RLAN: 5.500GHz ~ 5.700GHz RLAN: 5.745GHz ~ 5.825GHz Others: 433.92MHz 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 Wi-Fi 1.96G/BT: 1.96 dBi MPE Evaluation SAR Evaluation

Limits for Maximum Permissible Exposure(MPE)

Frequency

Electric Field Magnetic Field

Power

Range(MHz) Strength(V/m) Strength(A/m) Density(mW/cm2)

(A) Limits for Occupational/Control Exposures

300-1500

--

--

F/300

1500-100000

--

--

5

(B) Limits for General Population/Uncontrol Exposures

300-1500

--

--

F/1500

1500-100000

--

--

1

Average Time
6 6
6 30

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.
Max Measurement Result

Operating Mode

Field strength (dBuV/m)

SRD 433.92MHz

86.16

Max Output power=Field strength-95.2=86.16-95.2=-11.19dBm

Note: ERP(dBm)=(dBV/m)-95.2-2.15

Max Output power (dBm)
-11.19

Measured Tune up Operating Mode Power tolerance

BDR&EDR BLE
WiFi 2.4G SRD

(dBm) 0.89 4.06 15.94 -11.19

(dBm) 0.89 ±1 4.06 ±1 15.94 ±1 -11.19 ±1

Max. Tune Antenna up Power Gain

(dBm) 1.89 5.06 16.94 -10.19

(dBi) 1.96 1.96 1.96
0

Power

density at

Power

20cm density Limits

(mW/cm2 )

(mW/ cm2 )

0.0005

1

0.0010

1

0.0155

1

0.0000191

0.29

No. Applicable Simultaneous Transmission 1. BT+SRD 2. WiFi +SRD
The Maximum simultaneous transmission for WiFi +SRD:
=SWiFi 2.4G /Slimit-2.4+ SSRD/Slimit-SRD =0.0155/1+0.00002/0.29 =0.0156 < 1.0
Note: BT&WiFi cannot support simultaneous transmission. Result: No Standalone SAR test is required.

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