RF Exposure

FCC ID: 2AHMR-ESP32-S

RF Exposure Info

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FCCID_4169852

RF Exposure evaluation FCC ID: 2AHMR-ESP32-S 1. Reference According to §1.1307(b)(1), 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 level in excess of the Commission’s guidelines. According to §1.1310 and §2.1091 RF exposure is calculated. KDB447498 D01: Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies 2. Limit Limits for Maximum Permissible Exposure (MPE)/Controlled Exposure Frequency Electric Field Magnetic Field Power Density Averaging Time Range(MHz) Strength(V/m) Strength(A/m) (mW/cm²) (minute) Limits for Occupational/Controlled Exposure 0.3 – 3.0 614 1.63 (100) * 6 3.0 – 30 1842/f 4.89/f (900/f2)* 6 30 – 300 61.4 0.163 1.0 6 300 – 1500 / / f/300 6 1500 – 100,000 / / 5 6 Limits for Maximum Permissible Exposure (MPE)/Uncontrolled Exposure Frequency Electric Field Magnetic Field Power Density Averaging Time Range(MHz) Strength(V/m) Strength(A/m) (mW/cm²) (minute) Limits for Occupational/Controlled Exposure 0.3 – 3.0 614 1.63 (100) * 30 3.0 – 30 824/f 2.19/f (180/f2)* 30 30 – 300 27.5 0.073 0.2 30 300 – 1500 / / f/1500 30 1500 – 100,000 / / 1.0 30 F=frequency in MHz *=Plane-wave equivalent power density

3. MPE 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 an isotropic radiator R=distance to the center of radiation of the antenna 4. Result As declared by the Applicant, the EUT is a wireless device used in a fix application, at least 20 cm from any body part of the user or nearby persons; from the maximum EUT RF output power, the minimum separation distance, r =20cm, as well as the gain of the used antenna is 0dBi, the RF power density can be obtained. Max. Max. Power Power Antenna Output Output Density Density Test Mode Gain Power Power At 20 cm Limit FCC Results (Numeric) 2 2 (dBm) (mW) (mW/cm ) (mW/cm ) 802.11b 21.19 131.52 1.0000 0.0262 1.0000 PASS 802.11g 24.84 304.79 1.0000 0.0606 1.0000 PASS 802.11n20 24.96 313.33 1.0000 0.0623 1.0000 PASS 802.11n40 24.63 290.40 1.0000 0.0578 1.0000 PASS Bluetooth 5.659 3.68 1.0000 0.0007 1.0000 PASS BLE 2.192 1.66 1.0000 0.0003 1.0000 PASS 5. Conclusion The RF exposure evaluation is not required.


Document Created: 2019-02-14 13:16:01
Document Modified: 2019-02-14 13:16:01
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