RF Exposure

FCC ID: 2ANDLTYBT2

RF Exposure Info

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FCCID_4258150

Bay Area Compliance Laboratories Corp. (Kunshan) Report No.: RSHD190131002-00A

FCC §1.1310& §2.1091 - MAXIMUM PERMISSIBLE EXPOSURE (MPE)
Applicable Standard

According to subpart 15.247(i) and subpart §1.1310, systems operating under the provisions of this section
shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in
excess of the Commission’s guidelines.

Limits for Maximum Permissible Exposure (MPE) (§1.1310, §2.1091)

(B) Limits for General Population/Uncontrolled Exposure
Frequency Range Electric Field Magnetic Field Power Density Averaging Time
(MHz) Strength (V/m) Strength (A/m) (mW/cm2) (minutes)
0.3-1.34 614 1.63 *(100) 30
1.34-30 824/f 2.19/f *(180/f²) 30
30-300 27.5 0.073 0.2 30
300-1500 / f/1500 30
1500-100,000 / 1.0 30

f = frequency in MHz; * = Plane-wave equivalent power density;

According to §1.1310 and §2.1091 RF exposure is calculated.

Calculated Formulary:

Predication of MPE limit at a given distance
S = PG/4πR² = power density (in appropriate units, e.g. mW/cm2);
P = power input to the antenna (in appropriate units, e.g., mW);
G = power gain of the antenna in the direction of interest relative to an isotropic radiator, the power gain
factor, is normally numeric gain;
R = distance to the center of radiation of the antenna (appropriate units, e.g., cm);

Calculated Data:

Frequency Tune-up Evaluation Power
Antenna Gain MPE Limit
Mode Range Conducted Power Distance Density
(mW/cm2)
(MHz) (dBi) (numeric) (dBm) (mW) (cm) (mW/cm2)

BLE 2402~2480 2.00 1.58 6.50 4.47 20 0.0014 1.0

Conclusion: The EUT meets exemption requirement- RF exposure evaluation greater than 20cm distance specified in
§ 2.1091. If the device built into a host as a portable usage, the additional RF exposure evaluation may be required as
specified by§ 2.1093.

FCC Part 15.247 Page 11 of 43

Document Created: 2019-04-30 02:31:07
Document Modified: 2019-04-30 02:31:07

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