Misc RF Exposure Exhibits

FCC ID: DD4P10TD

RF Exposure Info

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FCCID_4077558

Maximum Permissible Exposure calculations

The MPE distance will be calculated for the worst case of a 100% transmitter duty cycle.
For an isotropic radiator the surface area of a sphere can be used to determine the area
over which the transceiver energy is radiated.

Surface area of a sphere = 4 * π * radius2

In the case where there is an antenna gain, the worst case energy density is increased by
the antenna gain. In this case, the exposure level for a controlled environment can be
calculated as follows:

MPE distance =((output power*duty cycle*10*(antenna gain/10))/(4*π*Exposure Limit
[mW/cm2]))1/2

In the case of 2.15 dBi antenna at 698MHz

MPE distance = ((100 mW * 1 * 1.64) /( 4 * 3.14 * 0.47))1/2
= 5.3 cm

Document Created: 2011-03-18 08:57:06
Document Modified: 2011-03-18 08:57:06

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