EBESHW05 LED LAMP with 2.4G WiFi RF Exposure Info RF EXPOSURE Report_MPE Hangzhou Eboylamp Electronics Co., Ltd.
Hangzhou Eboylamp Electronics Co., Ltd. LED LAMP with 2.4G WiFi
RF Exposure Report FCC-ID: 2AJ3WEBESHW05 RF Exposure Measurement The limit for Maximum Permissible Exposure (MPE) specified in FCC 1.1310 is followed. The gain of the antennas used in the product is extracted from the Antenna data sheets provided and also the maximum total power input to the antenna is measured. Through the Friis transmission formula and the maximum gain of the antenna, we can calculate the distance, away from the product, where the limit of MPE is reached. Although the Friis Transmission formula is far field assumption, the calculated result of that is an over-prediction for near field power density. It is taken as worst case to specify the safety range. RF Exposure Limit According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environmental impact of the human exposure to radio-frequency (RF) radiation as specified in 1.1307 (b) Limits for Maximum Permissible Exposure (MPE) Frequency Range Electric Field Magnetic Field Power Density (MHz) Strength (V/m) Strength (A/m) (mW/cm²) Limits for Occupational / controlled Exposures 300 - 1500 -- -- F/300 1500 – 100000 -- -- 5.0 Limits for General population / Uncontrolled Exposure 300 - 1500 -- -- F/1500 1500 – 100000 -- -- 1.0 F= Frequency in MHz Friss Formula Friss Transmission Formula: Pd = (Pout * G) / (4*pi*r²) Where Pd = power density in mW/cm² Pout = output power to antenna in mW G = gain of antenna in linear scale Pi = 3.1416 R = Distance between observation point and the center of radiator in cm If we know the maximum gain of the antenna and the total output power to the antenna, through calculation, we will know MPE value at distance 20cm. EUT Operation condition EUT was enabled to transmit and receive at lowest, middle and highest channels. Classification The antenna of this product, under normal use condition, is at least 20cm away from the body of the user. Warning statement to the user for keeping at least 20cm or more separation distance from the antenna should be included in the User manual. So, this device is classified as Mobile device. 2.4G WIFI Mode 802.11b/g/n20:2412-2462MHz Detector PEAK 802.11b 17±1dBm 802.11g 16±1dBm 802.11n20 16±1dBm ANT Gain (G) Antenna gain : 2dBi (gain of antenna in linear scale=1.58) Channel Protocol 802.11 b 802.11 g 802.11 n20 Output Output Power Power to ANT Gain(gain of Frequenc Power to Limit Density Antenna antenna in Antenna (mW/cm²) (mW/cm²) (dBm) linear scale) (MHz) (mW) 1.58 1.58 1.58 2412 2412 2412 18 63.0957 17 50.1187 17 50.1187 0.01984 0.01576 0.01576
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File Type : PDF File Type Extension : pdf MIME Type : application/pdf PDF Version : 1.5 Linearized : No Page Count : 2 Language : zh-CN Tagged PDF : Yes Author : bovey Creator : Microsoft® Office Word 2007 Create Date : 2018:11:22 06:45:59+08:00 Modify Date : 2018:11:22 06:45:59+08:00 Producer : Microsoft® Office Word 2007