RF Exposure

FCC ID: H8NWLL4030

RF Exposure Info

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FCCID_346090

FCC ID: H8NWLL4030 FCC TEST REPORT REPORT NO.: RF920624R02 MODEL NO.: WLL4030 ACCORDING: FCC Guidelines for Human Exposure IEEE C95.1 APPLICANT: Askey Computer Corp. ADDRESS: 10F, No.119, ChienKang Rd., Chung-Ho, Taipei, Taiwan, R.O.C. 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.: 920624R02

FCC ID: H8NWLL4030 RF Exposure Measurement (Mobile Device) 1. Introduction 2.4GHz and 5GHz frequency bands are 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. Classification The modular is installed in the laptop PC with antennas mounted around LCD panel, under normal use condition, is at least 20cm away from the body of the user. Warning 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. 3. 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.: 920624R02

FCC ID: H8NWLL4030 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 4. 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 Pd is the limit of MPE, 1 mW/cm2. If we know the maximum Gain of the antenna and the total power input to the antenna, through the calculation, we will know the distance r where the MPE limit is reached. Ref. : David K. Cheng, Field and Wave Electromagnetics, Second Edition, Page 640, Eq. (11-133). 5. 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.: 920624R02

FCC ID: H8NWLL4030 6. Test Results 6.1 Antenna Gain The maximum Gain measured in Fully Anechoic Chamber are 3dBi or 2 .0 (numeric) for 2.4GHz and 2.8dBi or 1.91(numeric) for 5GHz. 6.2 Output Power Into Antenna & RF Exposure Distance : For Part 802.11b (CCK technique): Channel Limit of Output Power to Power Density Channel Frequency Power Density Antenna (mW) (mW/cm2 ) (MHz) (mW/cm2 ) 1 2412 43.853 0.017 1 6 2437 43.351 0.017 1 11 2462 43.652 0.017 1 For Part 802.11g (OFDM technique): Channel Limit of Output Power to Power Density Channel Frequency Power Density Antenna (mW) (mW/cm2 ) (MHz) (mW/cm2 ) 1 2412 43.853 0.017 1 6 2437 43.652 0.017 1 11 2462 43.652 0.017 1 For 802.11a (OFDM technique): Channel Limit of Output Power to Power Density Channel Frequency Power Density Antenna (mW) (mW/cm2 ) (MHz) (mW/cm2 ) 1 5180 33.651 0.013 1 4 5240 34.593 0.013 1 5 5260 46.131 0.017 1 8 5320 45.394 0.017 1 9 5747 69.502 0.026 1 12 5805 66.374 0.025 1 The minimum allowable distance is very close to the enclosure of the antenna and is very far away from the human being under normal use condition. ADT No.: 920624R02


Document Created: 2003-07-29 09:53:40
Document Modified: 2003-07-29 09:53:40
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