Attachment 80-Jxxxx-1_RF exposu

This document pretains to SES-LIC-20050621-00795 for License on a Satellite Earth Station filing.

IBFS_SESLIC2005062100795_437952

EMF Exposure Assessment 4.8-Meter Antenna for OmniTRACS Earth Station May 18, 2005 80-Jxxxx-1 Rev A Fang Han Restricted Distribution This document contains critical information about QUALCOMM products and may not be distributed to anyone that is not an employee of QUALCOMM without the approval of Configuration Management.


QUALCOMM Incorporated 5775 Morehouse Drive San Diego, CA 92121-1714 U.S.A. Copyright © 2005 QUALCOMM Incorporated. All rights reserved. Printed in the United States of America. All data and information contained in or disclosed by this document is confidential and proprietary information of QUALCOMM Incorporated and all rights therein are expressly reserved. By accepting this material, the recipient agrees that this material and the information contained therein is held in confidence and in trust and will not be used, copied, reproduced in whole or in part, nor its contents revealed in any manner to others without the express written permission of QUALCOMM Incorporated. OmniTRACS® , Wireless Business Solutions®, and QUALCOMM® are registered trademarks and registered service marks of QUALCOMM Incorporated. Other brand, product, or service names listed in this document are the trademarks/service marks or registered trademarks/service marks of their respective holders. Export of this technology may be controlled by the U.S. Government. Diversion contrary to U.S. law prohibited. The information in this document is subject to change with subsequent software releases without notice. EMF Exposure Assessment 5M Antenna for OmniTRACS Earth Station 80-Jxxxx-1 Rev A Fang Han May 2005

Contents Contents ................................................................................................................................ iv 1. Introduction..........................................................................................................................1 2. Antenna and System Parameters .......................................................................................1 3. Power Density Calculation ..................................................................................................3 3.1 Far Field Calculations.......................................................................................................3 3.2 Near Field Calculations ....................................................................................................3 3.3 Transition Region Calculations ........................................................................................4 3.4 Region between Power Feed and Sub-Reflector ..............................................................4 3.5 Antenna Surface (Main Reflector)....................................................................................5 3.6 Antenna Area in Plane with Sub-Reflector.......................................................................5 4. Conclusions...........................................................................................................................6 5. Reference ..............................................................................................................................7 6. Engineering Declaration......................................................................................................7 80-Jxxxx-1 Rev A QUALCOMM Proprietary Page iv

EMF Exposure Assessment 4.8M Antenna for OmniTRACS Earth Station Introduction 1. Introduction This report assesses non-ionizing electromagnetic field radiation from a 5-meter antenna for OmniTRACS earth station with pursuant to FCC OET Bulletin, No. 65, Edition 97-01 [1]. Power flux densities generated from the antenna at far field, near field, transition region, sub-reflector, and main reflector surface are calculated based on the method recommended by the FCC Bulletin. Table 1 outlines the limits of exposure to EMF in the Ku-band in terms of power density specified by FCC and ICNIRP [2]. Table 1. Maximum permissible exposure (MPE) limits at Ku-band Power density Average time (min) Exposure environment 2 (W/m ) FCC ICNIRP General public/uncontrolled 10 30 4 (based on 68/f 1.05) Occupational/controlled 50 6 4 (based on 68/f 1.05) 2. Antenna and System Parameters The antenna and system specifications for power density assessment are listed in Table 2. Drawing of the antenna assembly and partition of power density are shown in Fig.1 and Fig.2 respectively. The worst case of simultaneous transmit of 13 carriers are considered in the analysis. Table 2. Antenna and system specs Main reflector diameter and area D = 4.8 m , Aa = πD 2 / 4 = 18.1 m 2 Sub-reflector diameter and area DS = 0.356 m , AS = πDS 2 / 4 = 0.1 m 2 Wavelength at mid-band 14.25 GHz λ = 0.021 m Maximum feed power at antenna flange Pmax = 10 log(300) − 9 + 10 log(13) = 26.9 dBW = 491 W feed under 13 systems Average power in any 30-min and 6-min Pavg = 10 log(52) − 9 + 10 log(13) = 19.3 dBW = 85 W period at flange feed Antenna gain G = 55 dBi = 10 6 Antenna aperture efficiency η = (Gλ2 / 4πAa ) = 0.62 Antenna pattern beam-width -15dB (0.032) at 0.59° 80-Jxxxx-1 Rev A QUALCOMM Proprietary Page 1

Antenna and System Parameters EMF Exposure Assessment 4.8M Antenna for OmniTRACS Earth Station Figure 1. 4.8-meter ku-band antenna assembly – side view Page 2 QUALCOMM Proprietary 80-Jxxxx-1 Rev A

EMF Exposure Assessment 4.8M Antenna for OmniTRACS Earth Station On-Axis Power Density Calculation Figure 2. Radiation 4.8-meter ku-band antenna assembly – side view 4 1. far-field 2. near field 3. transition field 4. between feed and sub- reflector 5. antenna surface 5 6. surface in plane with sub-reflector 6 2 3 1 3. On-Axis Power Density Calculation 3.1 Far Field Calculations The distance to the beginning of the far field can be calculated as follows [1] 0.60 D 2 RFF = = 656.6 m λ The maximum on-axis power density in the far field can be calculated as follows G × Pmax (or EIRP) S FF = = 28.65 W/m 2 4πRFF2 The average on-axis power density in the far field can be then calculated as Pavg S FF _ avg = S FF = 4.96 W/m 2 Pmax The average off-axis (0.3°) power density in the far field can be calculated as S FF _ avg_off = 0.032 × S FF _ avg = 0.16 W/m 2 80-Jxxxx-1 Rev A QUALCOMM Proprietary Page 3

On-Axis Power Density Calculation EMF Exposure Assessment 4.8M Antenna for OmniTRACS Earth Station 3.2 Near Field Calculations The distance to the end of the near field can be calculated as follows D2 R NF = = 273.6 m 4λ The maximum on-axis power density in the near field can be determined by 16ηPmax S NF = = 66.89 W/m 2 πD 2 The average on-axis power density in the near field can be then calculated as Pavg S NF _ avg = S NF = 11.58 W/m 2 Pmax The average off-axis (>0.3°) power density in the near field can be calculated as S NF _ avg_off < 0.032 × S NF _ avg = 0.37 W/m 2 3.3 Transition Region Calculations The transition region will be the region extending from R NF to RFF . If the location falls within this transition region, the on-axis power density can be determined by the following equation: S NF R NF S TF = R The exposure level ST at the transition region R ( R NF < R < R FF ) would be less than near-field exposure level and greater than far field exposure level, i.e., S FF < S TF < S NF Therefore the average power density in transition region will not exceed 3.0 W/m 2 . 3.4 Region between Power Feed and Sub-Reflector The maximum on-axis power density between the RF power feed and sub- reflector can be determined by the following equation: Page 4 QUALCOMM Proprietary 80-Jxxxx-1 Rev A

EMF Exposure Assessment 4.8M Antenna for OmniTRACS Earth Station On-Axis Power Density Calculation Pmax S4 = = 4944 W/m 2 AS The average on-axis power density between the RF power feed and sub-reflector can be then calculated as Pavg S 4_avg = S 4 = 856 W/m 2 Pmax 3.5 Antenna Surface (Main Reflector) Assuming uniform illumination and full reflection of the reflector surface, the power density at the antenna surface (main reflector) can be calculated as follows: 4 Pmax S5 = = 108.5 W/m 2 Aa The average on-axis power density at the antenna surface (main reflector) can be then calculated as Pavg S 5_avg = S 5 = 18.8 W/m 2 Pmax The average off-axis (>0.3°) power density at the antenna surface (main reflector) can be calculated as S 5 _ avg_off < 0.032 × S 5 _ avg = 0.59 W/m 2 3.6 Antenna Area in Plane with Sub-Reflector Assuming uniform illumination of the reflector surface, the power density near the antenna surface in plane with sub-reflector can be calculated as follows: 2.56 P S6 = = 69.5 W/m 2 Aa The average power density near the antenna surface in plane with sub-reflector can be then calculated as 80-Jxxxx-1 Rev A QUALCOMM Proprietary Page 5

Conclusions EMF Exposure Assessment 4.8M Antenna for OmniTRACS Earth Station Pavg S 6_avg = S 6 = 12.0 W/m 2 Pmax The average off-axis (>0.3°) power density near the antenna surface in plane with sub-reflector can be calculated as S 5 _ avg_off < 0.032 × S 5 _ avg = 0.38 W/m 2 4. Conclusions Table 3 summarizes the expected RF exposure levels from the above analysis. Under the worst-case scenario, at regions in axis with main beam of the antenna, except the region between power feed and sub-reflector, the EMF exposure level would be below the occupational exposure limit specified by FCC and ICNIRP. At regions of off-axis (0.3º) from the main beam, the EMF exposure level would be below the public exposure limit specified by FCC and ICNIRP. Table 3. Summary of expected RF exposure levels in beam and outside beam area On-axis average Off-axis (>0.59º) ave RF Hazard assessment Region exposure level (W/m2) exposure level (W/m2) (off-axis area) Meet FCC MPE limit for Far field (R>657m) <4.96 <0.16 public exposure Transition field Meet FCC MPE limit for 5.0 – 11.6 0.16 – 0.37 (961m<R<2308m) public exposure Meet FCC MPE limit for Near field (R>964m) <11.6 <0.37 public exposure Between power feed 855.6 N/A Potential hazard and sub-reflector Antenna surface Meet FCC MPE limit for 18.8 0.59 (main reflector) public exposure Antenna area in Meet FCC MPE limit for plane with sub- 12.0 0.38 public exposure reflector In addition, the earth station with the antenna is isolated from public access by a fence by at least 10 meters. The antenna beam will be elevated at least 30 degrees from the horizontal plane for normal operation. The actual exposure would be much lower than the above analysis. To ensure RF safety for operating personnel, the transmitter will be turned off during antenna maintenance. Page 6 QUALCOMM Proprietary 80-Jxxxx-1 Rev A

EMF Exposure Assessment 4.8M Antenna for OmniTRACS Earth Station Reference 5. Reference [1] FCC OET Bullet No. 65, Edition 97-01, “Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields”, August 1997. [2] ICNIRP Guidelines, “Guidelines for limiting exposure to time-varying electric magnetic, and electromagnetic fields”, Health Physics, Vol.74, No.4, April 1998. 6. Engineering Declaration I hereby certify that the information contained in this test report is complete and true to the best of my knowledge. All test and analysis were performed in accordance with good engineering practices. Certified by: Fang Han Regulatory Engineer, Senior Staff Qualcomm Inc. Date: May 18, 2005 80-Jxxxx-1 Rev A QUALCOMM Proprietary Page 7


Document Created: 2005-05-19 15:56:06
Document Modified: 2005-05-19 15:56:06
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