User Guide
FCC MPE CALCULATION (FCC ID: 2AH4HATD310S)
RF Exposure Requirements: 47 CFR §1.1307(b)
RF Radiation Exposure Limits: 47 CFR §1.1310
RF Radiation Exposure Guidelines: FCC OST/OET Bulletin Number 65
EUT Frequency Band: BLE: 2402-2480MHz
WCDMA Band II: 1852.4 – 1907.6 MHz
WCDMA Band IV: 1712.4 – 1752.6 MHz
WCDMA Band V: 826.4 – 846.6 MHz
LTE Cat-1 Band 2: 1850.7-1909.3MHz
LTE Cat-1 Band 4: 1710.7-1754.3MHz
LTE Cat-1 Band 5: 824.7-848.3MHz
LTE Cat-1 Band 12: 699.7-715.3MHz
LTE Cat-1 Band 13: 779.5-784.5MHz
Limits for General Population/Uncontrolled Exposure in the band of: 300 - 1500 MHz,
Power Density Limit: f/1500 mW/cm2
Limits for General Population/Uncontrolled Exposure in the band of: 1500 - 100,000 MHz
Power Density Limit: 1 mW / cm
2
Equation: S = PG / 4R
2
or R = √PG / 4S
Where, S = Power Density
P = Power Input to Antenna
G = Antenna Gain
R = distance to the center of radiated antenna
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Prediction distance 20 cm
EUT: ATD310
Radio
Frequency (MHz)
Max Conducted
Output Power
(dBm)
Antenna Gain
(dBi)
Separation
distance (cm)
Power Density
(mW/ cm
2
)
MPE Limit (mW/
cm
2
)
BLE
2400-2480
3.35
-2.5
20
0.0002
1
WCDMA Band II
1852.4 – 1907.6
24.00
4
20
0.1255
1
WCDMA Band IV
1712.4 – 1752.6
24.00
4
20
0.1255
1
WCDMA Band V
826.4 – 846.6
24.00
4
20
0.1255
0.551
LTE Band2
1850.7-1909.3
24.50
4
20
0.1408
1
LTE Band4
1710.7-1754.3
24.50
4
20
0.1408
1
LTE Band5
824.7-848.3
24.50
4
20
0.1408
0.550
LTE Band12
699.7-715.3
24.50
4
20
0.1408
0.466
LTE Band13
779.5-784.5
24.50
4
20
0.1408
0.518
The above results show that the device complies with the MPE requirement.
The BLE is able to transmit simultaneously with LTE.
The ratio = 0.0002/1 + 0.1408/0.466 = 0.302 < 1.0
The above results show that the device complies with the simultaneous transmission MPE requirement.
Completed By: David Zhang
Vista Laboratories, Inc.
1261 Puerta Del Sol, San Clemente, CA 92673
Date: May 23rd, 2019