RF Exposure

FCC ID: RI7WE9223GR

RF Exposure Info

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FCCID_3349844

AT4wireless, S.A.U Parque Tecnologico de Andalucía, C/ Severo Ochoa 2 29590 Campanillas Málaga, España Subject: RF exposure analysis for the equipment with FCC ID: RI7WE9223GR; IC: 5131A-WE9223GR The device model: WE922-3GR (FCC ID: RI7WE9223GR; IC: 5131A-WE9223GR) is designed to be installed in and used in mobile exposure conditions. The antennas used for this device must be installed to provide a separation distance of at least 20 cm from all the persons and must not be co- located or operating in conjunction with any other antenna or transmitter. MPE exposure limits The table below is excerpted from Table 1B of 47 CFR 1.1310 titled Limits for Maximum Permissible Exposure (MPE), Limits for General Population/Uncontrolled Exposure: Frequency Range (MHz) Power density (mW/cm2) Averaging time (minutes) 1500 – 100.000 1,0 30 The table below is excerpted from RSS-102, Issue 5, section 4, titled “RF Field Strength Limits for Devices Used by the General Public (Uncontrolled Environment)”: Frequency Range (MHz) Power density (W/m2) Reference Period (minutes) 0.6834 300 – 6000 0.02619ƒ 6 Compliance analysis PG Using the equation S to calculate the exposure to electromagnetic fields 4R 2 where: S = power density (in appropriate units, e.g. mW/cm 2) P = power input to the antenna (in appropriate units, e.g., mW) G = power gain of the antenna in the direction of interest relative to an isotropic radiator R = distance to the center of radiation of the antenna (appropriate units, e.g., cm) compliance with FCC and IC MPE and EIRP limits is demonstrated based on the following calculations: 1. Standalone analysis 1.1 RF exposure in 2.4 GHz band: Calculations done using the antenna gain specified for this band. Only one of these 2.4 GHz modes works at a given moment. They do not work simultaneously. Maximum Reference conducted Evaluation Antenna MPE limit MPE limit Frequency frequency S Worst MPE Ratio Frequency output Duty cicle distance gain in USA in Canada Mode Range (Lowest TX slots (mW/cm^2 case MPE (S/MPE Band power (%) (MHz) freq.) ) limit limit) R (cm) (dBi) (mW/cm2) (mW/cm2) (MHz) Pin (dBm) 2402 - 2,4 ISM BLE 2402,0 5,49 N/A 100,0% 20 2,30 0,0012 1,0000 0,5351 0,5351 0,0022 2480 BL + EDR 2402 - 2,4 ISM 2402,0 6,27 N/A 100,0% 20 2,30 0,0014 1,0000 0,5351 0,5351 0,0027 (GFSK) 2480 BL + EDR 2402 - 2,4 ISM (pi/4- 2402,0 6,90 N/A 100,0% 20 2,30 0,0017 1,0000 0,5351 0,5351 0,0031 2480 DQPSK) BL + EDR 2402 - 2,4 ISM 2402,0 6,82 N/A 100,0% 20 2,30 0,0016 1,0000 0,5351 0,5351 0,0030 (8-DPSK) 2480 WiFi 2.4 2412 - 2,4 ISM GHz 2412,0 19,32 N/A 100,0% 20 2,30 0,0289 1,0000 0,5366 0,5366 0,0539 2462 (802.11b) WiFi 2.4 2412 - 2,4 ISM GHz 2412,0 17,21 N/A 100,0% 20 2,30 0,0178 1,0000 0,5366 0,5366 0,0332 2462 (802.11g) WiFi 2.4 GHz 2412 - 2,4 ISM 2412,0 16,42 N/A 100,0% 20 2,30 0,0148 1,0000 0,5366 0,5366 0,0276 (802.11n20 2462 ))

Conclusion The higher of MPE ratios in this case is 0.0539 The higher S is 0.0289 mW/cm^2  S = 0.289 W/m^2 In compliance with all limits of MPE PA By: Ken Bednasz Title: VP application engineer Company: Telit Communications S.p.A


Document Created: 2017-04-06 18:18:39
Document Modified: 2017-04-06 18:18:39
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