RF Exposure 2.4GHz

FCC ID: 2ADEFAT-DG1

RF Exposure Info

Download: PDF
FCCID_2595638

TRaC Global Test Report: TRA-021973WUS1 Appendix G: General SAR test reduction and exclusion guidance KDB 447498 Section 4.3 General SAR test reduction and exclusion guidance For Standalone SAR exclusion consideration, when SAR Exclusion Threshold requirement in KDB 447498 is satisfied, standalone SAR evaluation for general population exposure conditions by measurement or numerical simulation is not required. In the frequency range below 100 MHz to 6 GHz and test separation distance of 50mm, the SAR Test Exclusion Threshold for operation in the 2400 – 2483.5 MHz band will be determined as follows SAR Exclusion Threshold NT= { [ (MP/TSD) * √ fGHz ] + (TSD – 50mm) * 10 ] } Where: NT = Numeric Threshold (3.0 for 1-g SAR and 7.5 for 10-g SAR) MP = Max Power of channel (mW) (inc tune up) TSD = Min Test separation Distance (mm) = 50 fGHz = Transmit frequency (or 100MHz if lower) We can transpose this formula to allow us to find the maximum power of a channel allowed and compare this to the measured maximum power. MP= { [ (NT x TSD) / √ fGHz] + (TSD – 50) * 10] } Operating Frequency 2.412 GHz MP= { [ (3.0 x 50) / √2.412 ] + (50 – 50) * 10 } MP= { [150 / 1.55 ] + (0 * 10 } MP= 96.77mW Operating Frequency 2.442 GHz MP= { [ (3.0 x 50) / √2.442 ] + (50 – 50) * 10 } MP= { [150 / 1.56 ] + (0 * 10 } MP= 96.15mW Operating Frequency 2.472 GHz MP= { [ (3.0 x 50) / √2.472 ] + (50 – 50) * 10 } MP= { [150 / 1.57 ] + (0 * 10 } MP= 95.54mW Channel Frequency EIRP SAR Exclusion SAR Evaluation (MHz) (mW) Threshold 2412 69.18 96.77 Not Required 2442 28.84 96.15 Not Required 2472 26.92 95.54 Not Required Therefore standalone SAR evaluation for general population exposure conditions by measurement or numerical simulation is not required. 157

TRaC Global Test Report: TRA-021973WUS1 Appendix H: MPE exclusion calculation As per KDB 447498 47 CFR §§1.1307 and 2.1091 2.1091 Radio frequency radiation exposure evaluation: Portable devices. For purposes of these requirements mobile devices are defined by the FCC as transmitters designed to be used in other than fixed locations and to generally be used in such a way that a separation distance of at least 20 centimetres is normally maintained between radiating structures and the body of the user or nearby persons. These devices are normally evaluated for exposure potential with relation to the MPE limits. As the 20cm separation specified under FCC rules may not be achievable under normal operation of the EUT, an RF exposure calculation is needed to show the minimum distance required to be less than 0.6mW/cm2 power density limit, as required under FCC rules. Prediction of MPE limit at a given distance Equation from KDB 447498 D01 1.64 ERP 1.64 ERP S = re - arranged R = 4πR 2 S 4π where: S = power density R = distance to the centre of radiation of the antenna ERP = EUT Maximum power Result: Prediction Maximum Distance (R) cm required to be less than Power density limit 2 Frequency ERP 2 0.6mW/cm (S) (mW/cm ) (MHz) (mW) (cm) 2412 69.18 0.6 3.9 2442 28.84 0.6 2.5 2472 26.92 0.6 2.4 158


Document Created: 2019-09-28 11:41:33
Document Modified: 2019-09-28 11:41:33
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC