MPE - Part 90

FCC ID: QJEAP716101

RF Exposure Info

Download: PDF

FCCID_1519482

RF Exposure Requirements: §1.1307(b)(1) and §1.1307(b)(2): 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 levels in excess
of the Commission’s guidelines.

RF Radiation Exposure Limit: §1.1310: As specified in this section, the Maximum Permissible
Exposure (MPE) Limit shall be used to evaluate the environmental
impact of human exposure to radiofrequency (RF) radiation as specified
in Sec. 1.1307(b), except in the case of portable devices which shall be
evaluated according to the provisions of Sec. 2.1093 of this chapter.

MPE Limit Calculation: EUT’s operating frequencies @ 4940-4990 MHz; highest
conducted power = 13.73dBm (peak) therefore, Limit for Uncontrolled exposure: 1
mW/cm2 or 10 W/m2

Gain of Antenna Elements @ 4.9GHz = 10 dBi
# of Antenna Elements = 3
EUT maximum antenna gain = 10dBi + 10*log(3)dBi = 14.77 dBi.

Equation from page 18 of OET 65, Edition 97-01

S = PG / 4R2 or R = √PG / 4S

where, S = Power Density (1 mW/cm2)
P = Power Input to antenna (23.59mW)
G = Antenna Gain (29.99 numeric)

R = (23.59*29.99/ 4*3.14*1.0)1/2 = (707.62/12.56) 1/2 = 7.504 cm

Document Created: 2011-05-27 11:23:55
Document Modified: 2011-05-27 11:23:55

© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC