RF Exposure Info

FCC ID: KA2DIR625C1

RF Exposure Info

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FCCID_770944

FCC ID: KA2DIR625C1 RF EXPOSURE REPORT REPORT NO.: SA960202L03 MODEL NO.: DIR-625 ACCORDING: FCC Guidelines for Human Exposure IEEE C95.1 APPLICANT: D-Link Corporation ADDRESS: 17595 Mt. Herrmann, Fountain Valley, CA 92708, U.S.A. ISSUED BY: Advance Data Technology Corporation LAB ADDRESS: No. 47, 14th Ling, Chia Pau Tsuen, Lin Kou Hsiang 244, Taipei Hsien, Taiwan, R.O.C. TEST LOCATION: No. 19, Hwa Ya 2nd Rd., Wen Hwa Tsuen, Kwei Shan Hsiang, Taoyuan Hsien 333, Taiwan, R.O.C. Report No: SA960202L03 1

FCC ID: KA2DIR625C1 RF EXPOSURE MEASUREMENT (MOBILE DEVICE) 1. INTRODUCTION 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) calibrated for antenna measurement in ADT, 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 a far field assumption, the calculated result of that is an over-prediction for near field power density. We will take that as the worst case to specify the safety range. 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) LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) FREQUENCY ELECTRIC FIELD MAGNETIC FIELD POWER DENSITY AVERAGE TIME RANGE (MHz) STRENGTH (V/m) STRENGTH (A/m) (mW/cm2) (minutes) (A)LIMITS FOR OCCUPATIONAL / CONTROL EXPOSURES 300-1500 … … F/300 6 1500-100,000 … … 5 6 (B)LIMITS FOR GENERAL POPULATION / UNCONTROLLED EXPOSURE 300-1500 … … F/1500 6 1500-100,000 … … 1.0 30 F = Frequency in MHz Report No: SA960202L03 2

FCC ID: KA2DIR625C1 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 r. 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. 5. CLASSIFICATION This device is fixed inside the host equipment. Warning statement to the user for keeping at least 20cm or more separation distance with the antenna should be included in users manual. So, this device is classified as Mobile Device. Report No: SA960202L03 3

FCC ID: KA2DIR625C1 6. TEST RESULTS 6.1 ANTENNA GAIN The maximum Gain measured in Fully Anechoic Chamber is 2.0dBi or 1.5849 (numeric). 6.2 OUTPUT POWER INTO ANTENNA & RF EXPOSURE VALUE AT DISTANCE 20cm: 802.11b DSSS MODULATION: PEAK POWER OUTPUT PEAK POWER OUTPUT TOTAL TOTAL LIMIT OF CHANNEL POWER (mW) (dBm) PEAK PEAK POWER CHAN. FREQUENCY DENSITY POWER POWER (mW/CM2) DENSITY (MHz) (mW/CM2)) CHAIN 0 CHAIN 1 CHAIN 0 CHAIN 1 (mW) (dBm) 1 2412 40.644 39.902 16.09 16.01 80.547 19.06 0.025 1.0 6 2437 64.863 63.241 18.12 18.01 128.105 21.08 0.040 1.0 11 2462 65.163 63.973 18.14 18.06 129.136 21.11 0.041 1.0 802.11g OFDM modulation: PEAK POWER OUTPUT PEAK POWER OUTPUT TOTAL TOTAL LIMIT OF CHANNEL POWER (mW) (dBm) PEAK PEAK POWER CHAN. FREQUENCY DENSITY POWER POWER (mW/CM2) DENSITY (MHz) (mW/CM2)) CHAIN 0 CHAIN 1 CHAIN 0 CHAIN 1 (mW) (dBm) 1 2412 40.738 39.994 16.10 16.02 80.733 19.07 0.025 1.0 6 2437 40.926 40.087 16.12 16.03 81.013 19.09 0.026 1.0 11 2462 40.926 40.365 16.12 16.06 81.291 19.10 0.026 1.0 Report No: SA960202L03 4

FCC ID: KA2DIR625C1 DRAFT 802.11n (20MHz) OFDM modulation - DUAL TX PEAK POWER OUTPUT PEAK POWER OUTPUT TOTAL TOTAL LIMIT OF CHANNEL POWER (mW) (dBm) PEAK PEAK POWER CHAN. FREQUENCY DENSITY POWER POWER (mW/CM2) DENSITY (MHz) (mW/CM2)) CHAIN 0 CHAIN 1 CHAIN 0 CHAIN 1 (mW) (dBm) 1 2412 29.242 28.973 14.66 14.62 58.215 17.65 0.018 1.0 6 2437 45.814 45.394 16.61 16.57 91.208 19.60 0.029 1.0 11 2462 46.238 44.875 16.65 16.52 91.113 19.60 0.029 1.0 DRAFT 802.11n (40MHz) OFDM modulation - DUAL TX PEAK POWER OUTPUT PEAK POWER OUTPUT TOTAL TOTAL LIMIT OF CHANNEL POWER (mW) (dBm) PEAK PEAK POWER CHAN. FREQUENCY DENSITY POWER POWER (mW/CM2) DENSITY (MHz) (mW/CM2)) CHAIN 0 CHAIN 1 CHAIN 0 CHAIN 1 (mW) (dBm) 1 2422 28.840 28.379 14.60 14.53 57.220 17.58 0.018 1.0 4 2437 46.345 45.394 16.66 16.57 91.739 19.63 0.029 1.0 7 2452 39.898 35.724 15.67 15.53 72.625 18.61 0.023 1.0 Report No: SA960202L03 5


Document Created: 2007-03-12 14:37:10
Document Modified: 2007-03-12 14:37:10
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