RF Exposure

FCC ID: 2ANDL-TYBT5

RF Exposure Info

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FCCID_4145319

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/cm ) 2
(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:

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

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.

Document Created: 2019-03-21 16:42:29
Document Modified: 2019-03-21 16:42:29

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