RF Exposure Info

FCC ID: TLZ-NU224

RF Exposure Info

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FCCID_988661

FCC ID: TLZ-NU224 RF EXPOSURE REPORT REPORT NO.: SA970731L09 MODEL NO.: AW-NU224 ACCORDING: FCC Guidelines for Human Exposure IEEE C95.1 APPLICANT: AzureWave Technologies, Inc. ADDRESS: 8F, No. 94, Baozhong Rd., Xindian, Taipei, Taiwan 231. ISSUED BY: Advance Data Technology Corporation LAB ADDRESS: No. 47, 14th Ling, Chia Pau Tsuen, Lin Kou Hsiang, Taipei Hsien 244, 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: SA970731L09 1

FCC ID: TLZ-NU224 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 30 1500-100,000 … … 1.0 30 F = Frequency in MHz Report No: SA970731L09 2

FCC ID: TLZ-NU224 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: SA970731L09 3

FCC ID: TLZ-NU224 6. TEST RESULTS 6.1 ANTENNA GAIN The maximum Gain measured in Fully Anechoic Chamber is 2dBi or 1.58489 (numeric). 6.2 OUTPUT POWER INTO ANTENNA & RF EXPOSURE VALUE AT DISTANCE 20cm: 802.11b DSSS MODULATION: LIMIT OF CHANNEL PEAK POWER POWER PEAK POWER POWER CHANNEL FREQUENCY OUTPUT DENSITY OUTPUT (mW) DENSITY (MHz) (dBm) (mW/CM2) (mW/CM2) 1 2412 80.724 19.07 0.025 1.000 6 2437 81.283 19.10 0.026 1.000 11 2462 80.353 19.05 0.025 1.000 802.11g OFDM MODULATION: LIMIT OF CHANNEL PEAK POWER POWER PEAK POWER POWER CHANNEL FREQUENCY OUTPUT DENSITY OUTPUT (mW) DENSITY (MHz) (dBm) (mW/CM2) (mW/CM2) 1 2412 285.759 24.56 0.090 1.000 6 2437 286.418 24.57 0.090 1.000 11 2462 287.078 24.58 0.091 1.000 DRAFT 802.11n (20MHz) OFDM MODULATION: LIMIT OF CHANNEL PEAK POWER POWER PEAK POWER POWER CHANNEL FREQUENCY OUTPUT DENSITY OUTPUT (mW) DENSITY (MHz) (dBm) (mW/CM2) (mW/CM2) 1 2412 283.792 24.53 0.089 1.000 6 2437 285.102 24.55 0.090 1.000 11 2462 285.759 24.56 0.090 1.000 DRAFT 802.11n (40MHz) OFDM MODULATION: LIMIT OF CHANNEL PEAK POWER POWER PEAK POWER POWER CHANNEL FREQUENCY OUTPUT DENSITY OUTPUT (mW) DENSITY (MHz) (dBm) (mW/CM2) (mW/CM2) 1 2412 179.473 22.54 0.057 1.000 4 2437 178.238 22.51 0.056 1.000 7 2452 179.887 22.55 0.057 1.000 Report No: SA970731L09 4


Document Created: 2008-08-12 16:36:13
Document Modified: 2008-08-12 16:36:13
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