RF Exposure

FCC ID: MSQ-RTN15U

RF Exposure Info

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FCCID_1570121

                                                                          Report No. 118108R-RF-US-Exp




         RF Exposure Evaluation declaration


                    Product Name : Gigabit Wireless-N Router
                    Model No.              : RT-N15U
                    FCC ID.                : MSQ-RTN15U




       Applicant : ASUSTeK COMPUTER INC.
       Address : No. 15, Li-Te Rd., Peitou, Taipei 112, Taiwan R.O.C.




                      Date of Receipt             : 2011/08/01
                      Date of Declaration : 2011/08/26
                      Report No.                  : 118108R-RF-US-Exp
                      Report Version              : V1.0




The declaration results relate only to the samples calculated.
The declaration shall not be reproduced except in full without the written approval of QuieTek Corporation.




                                          Page: 1 of 4


                                                                      Report No. 118108R-RF-US-Exp




1.      RF Exposure Evaluation

1.1.    Limits

        According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate
        the environment impact of human exposure to radio frequency (RF) radiation as specified in
        1.1307(b)
        LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE)
        Frequency Range        Electric Field     Magnetic Field    Power Density      Average Time
                                                                                2
               (MHz)          Strength (V/m)      Strength (A/m)      (mW/cm )           (Minutes)
                                (A) Limits for Occupational/ Control Exposures
             300-1500                --                  --             F/300                6
           1500-100,000              --                  --                5                 6
                           (B) Limits for General Population/ Uncontrolled Exposures
             300-1500                --                  --             F/1500               6
           1500-100,000              --                  --                1                 30
        F= Frequency in MHz


       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 id 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.



1.2.    Test Procedure

         Software provided by client enabled the EUT to transmit and receive data at lowest, middle
         and highest channel individually.
         The temperature and related humidity: 18℃and 78% RH.


                                          Page: 2 of 4


                                                                     Report No. 118108R-RF-US-Exp


1.3.      Test Result of RF Exposure Evaluation

Product            Gigabit Wireless-N Router
Test Mode          Mode 1: Transmit
Test Condition     RF Exposure Evaluation


Antenna Gain
Antenna Gain: The maximum Gain measured in fully anechoic chamber is 2.89dBi or 1.95 in linear
scale.


Output Power into Antenna & RF Exposure Evaluation Distance:

IEEE 802.11b
WLAN Function

                      Channel Frequency        Output Power to Antenna Power Density at R = 20 cm
       Channel
                             (MHz)                        (mW)                   (mW/cm2)

          1                   2412                       199.9862                 0.07758

          6                   2437                       148.2518                 0.05751

          11                  2462                       140.2814                 0.05442


IEEE 802.11g
WLAN Function

                      Channel Frequency        Output Power to Antenna Power Density at R = 20 cm
       Channel
                             (MHz)                        (mW)                   (mW/cm2)

          1                   2412                       257.6321                 0.09995

          6                   2437                       373.2502                 0.14480

          11                  2462                       316.9567                 0.12296


The power density Pd (4th column) at a distance of 20 cm calculated from the Friis transmission
formula is far below the limit of 1 mW/cm2.




                                          Page: 3 of 4


                                                                     Report No. 118108R-RF-US-Exp



Product            Gigabit Wireless-N Router
Test Mode          Mode 1: Transmit
Test Condition     RF Exposure Evaluation


Antenna Gain
Antenna Gain: The maximum Gain measured in fully anechoic chamber are 2.89dBi or 1.95 in linear
scale (Antenna 0); 2.51 dBi or 1.78 in linear scale (Antenna 1), the maximum Gain is 5.71 dBi or 3.73
in linear scale.


Output Power into Antenna & RF Exposure Evaluation Distance:

IEEE 802.11n (20MHz)
WLAN Function

                      Channel Frequency        Output Power to Antenna Power Density at R = 20 cm
      Channel
                             (MHz)                        (mW)                    (mW/cm2)

          1                   2412                       605.3409                  0.44920

          6                   2437                       668.3439                  0.49595

          11                  2462                       729.4575                  0.54130


IEEE 802.11n (40M)
WLAN Function

                      Channel Frequency        Output Power to Antenna Power Density at R = 20 cm
      Channel
                             (MHz)                        (mW)                    (mW/cm2)

          3                   2422                       258.8213                  0.19206

          6                   2437                       642.6877                  0.47691

          9                   2452                       384.5918                  0.28539


The power density Pd (4th column) at a distance of 20 cm calculated from the Friis transmission
formula is far below the limit of 1 mW/cm2.




                                          Page: 4 of 4



Document Created: 2011-09-09 13:40:19
Document Modified: 2011-09-09 13:40:19

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