RF Exposure Info

FCC ID: KA2WA552A1

RF Exposure Info

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FCCID_701685

FCC ID: KA2WA552A1 RF EXPOSURE REPORT REPORT NO.: SA950703L07 MODEL NO.: DWA-552 OEM MODEL NO.: DWA-547 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: SA950703L07 1

FCC ID: KA2WA552A1 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: SA950703L07 2

FCC ID: KA2WA552A1 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: SA950703L07 3

FCC ID: KA2WA552A1 6. TEST RESULTS 6.1 ANTENNA GAIN The maximum Gain measured in Fully Anechoic Chamber is 2dBi or 1.585(numeric). 6.2 OUTPUT POWER INTO ANTENNA & RF EXPOSURE VALUE AT DISTANCE 20cm: 802.11b DSSS MODULATION: CHANNEL PEAK POWER OUTPUT (mW) PEAK POWER OUTPUT (dBm) CHANNEL FREQUENCY (MHz) CHAIN 0 CHAIN 1 CHAIN 2 CHAIN 0 CHAIN 1 CHAIN 2 1 2412 40.644 40.551 40.365 16.09 16.08 16.06 6 2437 71.779 71.285 70.958 18.56 18.53 18.51 11 2462 50.582 50.486 50.350 17.04 17.03 17.02 CHANNEL LIMIT OF TOTAL PEAK TOTAL PEAK POWER DENSITY CHANNEL FREQUENCY 2 POWER DENSITY POWER (mW) POWER (dBm) (mW/CM )) (MHz) (mW/CM2) 1 2412 121.560 20.848 0.038 1.0 6 2437 214.022 23.305 0.067 1.0 11 2462 151.418 21.802 0.048 1.0 Report No: SA950703L07 4

FCC ID: KA2WA552A1 802.11g OFDM MODULATION: CHANNEL PEAK POWER OUTPUT (mW) PEAK POWER OUTPUT (dBm) CHANNEL FREQUENCY (MHz) CHAIN 0 CHAIN 1 CHAIN 2 CHAIN 0 CHAIN 1 CHAIN 2 1 2412 45.290 45.082 44.771 16.56 16.54 16.51 6 2437 56.885 56.754 56.364 17.55 17.54 17.51 11 2462 36.058 35.975 35.727 15.57 15.56 15.53 CHANNEL LIMIT OF TOTAL PEAK TOTAL PEAK POWER DENSITY CHANNEL FREQUENCY 2 POWER DENSITY POWER (mW) POWER (dBm) (mW/CM )) (MHz) (mW/CM2) 1 2412 135.143 21.308 0.043 1.0 6 2437 170.003 22.305 0.054 1.0 11 2462 107.760 20.325 0.034 1.0 Report No: SA950703L07 5

FCC ID: KA2WA552A1 DRAFT 802.11n (20MHz) OFDM modulation - TRIPLE TX CHANNEL PEAK POWER OUTPUT (mW) PEAK POWER OUTPUT (dBm) CHANNEL FREQUENCY (MHz) CHAIN 0 CHAIN 1 CHAIN 2 CHAIN 0 CHAIN 1 CHAIN 2 1 2412 32.211 32.137 31.769 15.08 15.07 15.02 6 2437 57.016 56.754 56.364 17.56 17.54 17.51 11 2462 28.708 28.510 28.249 14.58 14.55 14.51 CHANNEL LIMIT OF TOTAL PEAK TOTAL PEAK POWER DENSITY CHANNEL FREQUENCY 2 POWER DENSITY POWER (mW) POWER (dBm) (mW/CM )) (MHz) (mW/CM2) 1 2412 96.117 19.828 0.030 1.0 6 2437 170.134 22.308 0.054 1.0 11 2462 85.467 19.318 0.027 1.0 Report No: SA950703L07 6

FCC ID: KA2WA552A1 DRAFT 802.11n (40MHz) OFDM modulation - TRIPLE TX CHANNEL PEAK POWER OUTPUT (mW) PEAK POWER OUTPUT (dBm) CHANNEL FREQUENCY (MHz) CHAIN 0 CHAIN 1 CHAIN 2 CHAIN 0 CHAIN 1 CHAIN 2 1 2422 14.322 14.289 14.158 11.56 11.55 11.51 4 2437 28.708 28.510 28.184 14.58 14.55 14.50 7 2452 14.355 14.289 14.191 11.57 11.55 11.52 CHANNEL LIMIT OF TOTAL PEAK TOTAL PEAK POWER DENSITY CHANNEL FREQUENCY 2 POWER DENSITY POWER (mW) POWER (dBm) (mW/CM )) (MHz) (mW/CM2) 1 2422 42.769 16.311 0.013 1.0 4 2437 85.402 19.315 0.027 1.0 7 2452 42.835 16.318 0.014 1.0 Report No: SA950703L07 7


Document Created: 2006-08-29 17:47:40
Document Modified: 2006-08-29 17:47:40
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