RF exposure evaluation

FCC ID: 2AFIW-SH32BZ

RF Exposure Info

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FCCID_4276074

Report No.: E20190305644901-7 Application No.: E20190305644901 MPE Report Exposure category: General population/uncontrolled environment EUT Type: Production Unit Device Type: Mobile Device Refer Standard: KDB 447498 D01 General RF Exposure Guidance v06 FCC Part 2 §2.1091 1. Evaluation method Systems operating under the provisions of FCC 47 CFR section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. In accordance with 47 CFR FCC Part 2 Subpart J, section 2.1091 this device has been defined as mobile device whereby a distance of 0.2m normally can be maintained between the user and the device, and below RF Permissible Exposure limit shall comply with. In accordance with KDB447498D01 for Simultaneous transmission MPE test exclusion applies when the sum of the MPE ratios for all simultaneous transmitting antennas incorporated in a host device, based on the calculated/estimated, numerically modeled or measured field strengths or power density, is ≤ 1.0. The MPE ratio of each antenna is determined at the minimum test separation distance required by the operating configurations and exposure conditions of the host device, according to the ratio of field strengths or power density to MPE limit, at the test frequency. Either the maximum peak or spatially averaged results from measurements or numerical simulations may be used to determine the MPE ratios. Spatial averaging does not apply when MPE is estimated using simple calculations based on far-field plane-wave equivalent conditions. The antenna installation and operating requirements for the host device must meet the minimum test separation distances required by all antennas, in both standalone and simultaneous transmission operations, to satisfy compliance. 2. Limits for General Population/Uncontrolled Exposure FCC ID: 2AFIW-SH32BZ Identifying code: 797393

Report No.: E20190305644901-7 Application No.: E20190305644901 3. Calculation Method Predication of MPE limit at a given distance Equation from page 18 of OET Bulletin 65, Edition 97-01 S=PG/4πR² Where: S=power density P=power input to antenna G=power gain of the antenna in the direction of interest relative to anisotropic radiator R=distance to the center of radiation of the antenna From the EUT RF output power, the minimum mobile separationdistance, d=0.2m, as well as the maximumgain of the used as follows, the RF powerdensity can be obtained. Frequency Antenna type and antenna number Maximum antenna Band gain BLE Antenna -0.042dBi 2.4GHz ZigBee Antenna -0.042dBi 4. Estimation Result 4.1 Conducted Power Results Bluetooth Peak Conducted Output Mode Channel Frequency(MHz) Power (dBm) 00 2402 16.06 GFSK-BLE 19 2440 15.47 39 2480 15.10 FCC ID: 2AFIW-SH32BZ Identifying code: 797393

Report No.: E20190305644901-7 Application No.: E20190305644901 ZigBee Peak Conducted Output Power Mode Channel Frequency(MHz) (dBm) 11 2405 14.53 QPSK 18 2440 13.51 26 2480 8.47 4.2 Manufacturing tolerance Bluetooth GFSK-BLE Frequency (MHz) 2402 2440 2480 Maximum Output Power (dBm) <=19.0 <=19.0 <=19.0 ZigBee QPSK Frequency (MHz) 2405 2440 2480 Maximum Output Power (dBm) <=15.0 <=14.0 <=9.0 4.3 Measurement Results 4.3.1 Standalone MPE Bluetooth Output power Antenna Antenna MPE (Including tune-up Duty MPE Mode Gain Gain Limits tolerance) Cycle (mW/cm2) (dBi) (linear) (mW/cm2) (dBm) (mW) GFSK-BLE 19 79.4328 -0.042 0.9904 100% 0.0157 1.0000 ZigBee Output power Antenna Antenna MPE (Including tune-up Duty MPE Mode Gain Gain Limits tolerance) Cycle (mW/cm2) (dBi) (linear) (mW/cm2) (dBm) (mW) QPSK-ZigBee 15 31.6228 -0.042 0.9904 100% 0.0062 1.0000 Remark: FCC ID: 2AFIW-SH32BZ Identifying code: 797393

Report No.: E20190305644901-7 Application No.: E20190305644901 1. Maximum power including tune-up tolerance; 2. MPE use distance is 20cm from manufacturer declaration of user manual. 3. We choose 2402 MHz for Bluetooth (lowest frequency operate at 2.4GHz)to calcul ate MPE limit as higher frequency will have higher MPE limits According to KDB447498 for Transmitters used in mobile exposure conditions for simultaneous transmission operations; The device support one WLAN/BT modular and one antenna, no need consider simultaneous transmission. Conclusion The measurement results comply with the FCC Limit per 47 CFR 2.1091 for the uncontrolled RF Exposure of mobile device. ---------------- END OF REPORT--------------- FCC ID: 2AFIW-SH32BZ Identifying code: 797393


Document Created: 2019-05-15 11:16:05
Document Modified: 2019-05-15 11:16:05
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