MPE Calculation

FCC ID: LDKC11011757

RF Exposure Info

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FCCID_4279166

MPE CALCULATION FCC ID: LDKC11011757 Host Model: C1121X-8PLTEPWB RF Exposure Requirements: 47 CFR §1.1307(b) RF Radiation Exposure Limits: 47 CFR §1.1310 RF Radiation Exposure Guidelines: FCC OST/OET Bulletin Number 65 EUT Frequency Band: 2412-2462 MHz, 5150-5250 MHz, 5470-5725 MHz, 5725-5850 MHz Limits for General Population/Uncontrolled Exposure in the band of: 1500-100,000 MHz Power Density Limit: 1 mW / cm2 Equation: S = PG / 4πR2 or R = √PG / 4πS Where, S = Power Density P = Power Input to Antenna G = Antenna Gain R = distance to the center of radiated antenna ______________________________________________________________________________________________________________________ EUT: Cisco Wireless Router, Model No.: C1121X-8PLTEPWB Internal PIFA Antenna Prediction distance 20cm (WLan 2.4GHz): Power = 20 dBm, Antenna Gain = 2.14 dBi, Directional Gain = 5.14 dBi, Power density = 0.0818 mW/cm2 (WLan 5GHz): Power = 20.7 dBm, Antenna Gain = 4 dBi, Directional Gain = 7 dBi, Power density = 0.148 mW/cm2 CH Conducted Antenna Directiona Tolerance Calculated MPE Tune-Up Max Power Measurement Freq Power Gain l Gain MPE Limit Pass/ Type Tolerance (dBm) Distance (cm) (MHz) (dBm) (dBi) (dBi) (mW/cm2) (mW/cm2) Fail WLAN 2462 20 2.14 5.14* ±1dB 21 20 0.0818 1 Pass 2.4GHz WLAN 5795 20.7 4 7* ±1dB 21.7 20 0.148 1 Pass 5GHz *Correlated Gain. Co-location worse case: 2.4GHz WLAN = (0.0818/1) x 100% = 8.18% 5 GHz WLAN = (0.148/1) x 100% = 14.8% Total MPE Percentage = (8.18+14.8) % = 22.98%< 100% The Above Result had shown that the device complied with MPE requirement at a prediction distance of 20cm. Completed By: Deon Dai SIEMIC, Inc 775 Montague Expressway, Milpitas, CA 95035 Phone: (408) 526-1188 Date: 04/10/2019


Document Created: 2019-04-22 11:45:21
Document Modified: 2019-04-22 11:45:21
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