RF Exposure Info

FCC ID: PY3WG121

RF Exposure Info

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FCCID_355356

FCC ID: PY3WG121 FCC TEST REPORT REPORT NO.: RF920820R03 MODEL NO.: WG121 ACCORDING: FCC Guidelines for Human Exposure IEEE C95.1 APPLICANT: NETGEAR, INC. ADDRESS: 4500 GREAT AMERICA PARKWAY SANTA CLARA CA95054 U.S.A. ISSUED BY: Advance Data Technology Corporation LAB LOCATION: 47 14th Lin, Chiapau Tsun, Linko, Taipei, Taiwan, R.O.C. Lab Code: 200102-0 0528 ILAC MRA ADT No.: 920820R03

FCC ID: PY3WG121 RF Exposure Measurement (Mobile Device) 1. Introduction 2.4GHz frequency band is regarded specially as a dangerous band for its heating harmfulness to the human body. That’s why microwave oven is operating in this frequency band. The manufacturer whose product is working in this frequency band is obligatory to prove the harmfulness of his product. In this document, we try to prove the safety of radiation harmfulness to the human body for our product. The limit for Maximum Permissible Exposure (MPE) specified in FCC 1.1310 is followed. The Gain of the antenna used in this product is measured in a Fully Anechoic Chamber (FAC), and 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. 2. RF Exposure Limit According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environmental impact of human exposure to radio-frequency (RF) radiation as specified in 1.1307(b). ADT No.: 920820R03

FCC ID: PY3WG121 LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) Frequency Electric Field Magnetic Field Power Density Average Time Range Strength (V/m) Strength (A/m) (mW/cm2) (minutes) (MHz) (A)Limits For Occupational / Control Exposures 30-300 61.4 0.163 1.0 6 300-1500 … … F/300 6 1500-100,000 … … 5 6 (B)Limits For General Population / Uncontrolled Exposure 30-300 27.5 0.073 0.2 30 300-1500 … … F/1500 30 1500-100,000 … … 1.0 30 F = Frequency in MHz 3. Friis Formula Friis 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 center of the radiator in cm If we know the maximum Gain of the antenna and the total power input to the antenna, through the calculation, we will know the MPE value at distance 2.5cm. Ref. : David K. Cheng, Field and Wave Electromagnetics, Second Edition, Page 640, Eq. (11-133). 4. EUT Operating condition The software provided by Manufacturer enabled the EUT to transmit and receive data at lowest, middle and highest channel individually. ADT No.: 920820R03

FCC ID: PY3WG121 5. Classification The antenna of the product, under normal use condition, is at least 20cm away from the body of the user. Warming statement for keeping 20cm separation distance and the prohibition of operating next to a person has been printed on the user’s manual. So, this product is classified as the Mobile Device. 6. Test Results 6.1. Antenna Gain The maximum Gain measured in Fully Anechoic Chamber is 2dBi or 1.58(numeric). 6.2. Output Power Into Antenna & MPE value at distance 20cm: for 802.11b part Channel Limit of Output Power to Power Density Channel Frequency Power Density Antenna (mW) (mW/cm2) (MHz) (mW/cm2) 1 2412 62.66 0.020 1.0 6 2437 62.52 0.020 1.0 11 2462 62.37 0.020 1.0 for 802.11g part Channel Limit of Output Power to Power Density Channel Frequency Power Density Antenna (mW) (mW/cm2) (MHz) (mW/cm2) 1 2412 62.23 0.020 1.0 6 2437 61.94 0.020 1.0 11 2462 62.09 0.020 1.0 ADT No.: 920820R03


Document Created: 2003-09-08 15:51:47
Document Modified: 2003-09-08 15:51:47
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