Attachment Radiation_study[1].p

This document pretains to SES-LIC-20050629-00841 for License on a Satellite Earth Station filing.

IBFS_SESLIC2005062900841_436120

Created by Nikolay Yumatov 1 Confidential Page 5/10/2005 Radiation Hazard Study Evaluating Exposure to RF Emissions (FCC OET 65) Antenna : Prodelin RX/TX Linear Ku 1383 series Diameter= 3.8 m Gain Tx: 53.2 dBi Antenna Feed Flange Power P P ≡ 10.18 w D := 3.8 m Area of 3.8 Antenna A= 2 A := π   D 2 A = 11.341 m 2 The maximum power density directly in front of an antenna : 4P Ssurface := A Ssurface = 3.59 W /m2 = 0.359 mW/cm2 The maximum power density allowed 5mW/cm2 in controlled area. Surface = the maximum power at the antenna surface (W/m2) P = power fed to the antenna ( W) A = physical area of the aperture Antenna(sq.m) D= Diameter of the Antenna (m) η= aperture efficiency G = power gain in the direction of interest dB = Gain of the Antenna from the spec sheet(dB) λ = wavelength F= transmit frequency (GHz) F ≡ 14 dB ≡ 53.2 dB 10 G := 10 λ := ( 2.99792458 ⋅10 ) 8 9 F ⋅10 5 G = 2.089 × 10 ( G⋅λ2) 4π η :=  π ⋅D2    4  η = 0.672 Near -field , on -axis power density Snf =: 16η ⋅P Snf := 2 πD Snf = 2.414 W/m2=0.2414 mW/cm2 1

Created by Nikolay Yumatov 2 Confidential Page 5/10/2005 Extend of near-field region (m) Rnf: 2 D Rnf := 4λ Rnf = 168.583 m Maximum Power Density with 168 m distance to the antenna=2.414W/m2=0.2414mW/cm2 The distance to the beginning of the far-field region Rff (m): 2 0.6 ⋅D Rff := λ Rff = 404.6 m The power density in the far-field region Sff (W/m2): Where : R distance to the point of interest. R := 500m P ⋅G Sff := 2 4π R Sff = 0.677 w /m2 =0.0677 mW/cm2 The maximum allowable gain for the Antenna from the spec. sheet θ := 1 .. 48 Where θ : the angle in degrees from the axis of the main lobe Gfcc : allowable gain in dBi relative to an isotropic radiator Gfcc( θ ) := 29 − 25 ⋅log( θ ) Gfcc1( θ ) := 32 − 25 ⋅log( θ ) Gmh( θ ) := if( 1 ≤ θ ≤ 7 , Gfcc( θ ) , if( 7 < θ ≤ 9.2 , 8 , if( 9.2 < θ ≤ 48 , Gfcc1( θ ) , −10) ) ) 2

Created by Nikolay Yumatov 3 Confidential Page 5/10/2005 30 28.2 26.4 24.6 22.8 21 19.2 17.4 15.6 13.8 12 10.2 8.4 Gmh ( θ ) 6.6 4.8 3 1.2 0.6 2.4 4.2 6 7.8 9.6 11.4 13.2 15 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 θ The maximum allowable gain for the Antenna Define the Power density in the point of interest A see drawing 1 For the angel θ = 9 deg according to the table Distance to the Antenna (See drawing 1) R= R := 3m dB := 8 dB 10 G := 10 G = 6.31 P ⋅G Sff := 2 4π R Sff = 0.568 W /m2 = 0.0568 mW/cm2 The maximum power density allowed 1mW/cm2 in uncontrolled public area. The power density in the point of interest B For the angel θ = 40 deg according to the table dB 10 G := 10 dB := −7.8 3

Created by Nikolay Yumatov 4 Confidential Page 5/10/2005 Distance to the Antenna ( see drawing 1) R := 2 dB 10 G := 10 G = 0.166 P ⋅G Sff := 2 4π R Sff = 0.034 w /m2 = 0.0034 mW/cm2 The maximum power density allowed 1mW/cm2 in uncontrolled public area. The power density in the point of interest C dB := −10 For the angel θ = 45 deg according to the table Distance to the Antenna R= R := 2 dB 10 G := 10 P ⋅G Sff := 2 4π R Sff = 0.02 w /m2 = 0.002 mW/m2 The maximum power density allowed 1mW/cm2 in uncontrolled public area. 4

Created by Nikolay Yumatov 5 Confidential Page 5/10/2005 Fa r F ie ld Z one Tr a ns it io nZ on e Antenna Surface Ne ar fie ld (F r e sn el ) Zo ne 45.05 deg N C 2.0 m Controlled Area 9 deg 2.2m 3.0 m 2.0m A B Evaluation Exposure of RF emission DRAWN BY : for The Transmitton Antenna of Sacramento Church Nikolay Yumatov REV. SHT 1 OF 1 1 5


Document Created: 2005-06-10 19:57:23
Document Modified: 2005-06-10 19:57:23
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