MPE CALCULATIONS

FCC ID: VUJRM100USA

RF Exposure Info

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FCCID_889061

ATTACHMENT FCC ID: VUJRM100USA

** MPE Calculations **
The EUT will only be used with a separation of 20 centimeters or greater between the antenna and
the body of the user. The MPE calculation for this exposure is shown below.

The peak radiated output power (EIRP) is calculated as follows:

EIRP = P + G Where,
EIRP = 28.34 dBm + (-0.27)dBi P = Power input to the antenna (mW)
EIRP = 28.07dBm G = Power gain of the antenna (dBi)
Power density at the specific separation:
Where,
S = PG/(4R2π)
S = Maximum power density (mW/cm2)

S = (682.34 * 0.94) / (4 * 202 * π) P = Power input to the antenna (mW)
G = Numeric power gain of the antenna
S = 0.1276 mW/cm2 R = Distance to the center of the radiation of the antenna
(20cm = limit for MPE)
The Maximum permissible exposure (MPE) for the general population is 1 mW/cm2 .
The power density at 20cm does not exceed the 1 mW/cm2 limit. Therefore, the exposure
condition is compliant with FCC rules.
Estimated safe separation:
Where,
R = √(PG / 4π)
P = Power input to the antenna (mW)

R = √(682.34 * 0.94 / 4π) G = Numeric power gain of the antenna
R = Distance to the center of the radiation of the antenna
R = 7.15Cm (20cm = limit for MPE)

The numeric gain(G) of the antenna with a gain specified in dB is determined by:
G = Log-1 (dB antenna gain / 10)
G = Log-1 ((-0.27) / 10)
G = 0.94

Document Created: 2008-01-07 17:35:33
Document Modified: 2008-01-07 17:35:33

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