IEC TR 62669-2011 Case studies supporting IEC 62232 - Determination of RF field strength and SAR in the vicinity of radiocommunication base stations for the pur.pdf

1、 IEC/TR 62669 Edition 1.0 2011-05 TECHNICAL REPORT Case studies supporting IEC 62232 Determination of RF field strength and SAR in the vicinity of radiocommunication base stations for the purpose of evaluating human exposure IEC/TR 62669:2011(E) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED

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10、ciec.ch Tel.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC/TR 62669 Edition 1.0 2011-05 TECHNICAL REPORT Case studies supporting IEC 62232 Determination of RF field strength and SAR in the vicinity of radiocommunication base stations for the purpose of evaluating human exposure INTERNATIONAL ELECTROTE

11、CHNICAL COMMISSION XK ICS 13.280; 17.240 PRICE CODE ISBN 978-2-88912-528-9 Registered trademark of the International Electrotechnical Commission colour inside 2 TR 62669 IEC:2011(E) CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope . 6 2 Normative references . 6 3 Terms, definitions, symbols and abbrev

12、iated terms . 6 4 Overview of case studies 6 4.1 Case study synopsis . 6 4.2 Micro cell case study . 7 4.3 Roof-top case study with nearby apartment buildings 8 4.4 Roof-top / tower case study in residential area 9 4.5 Roof-top case study with direct access to antennas . 10 4.6 Roof-top case study w

13、ith large antennas and no direct access 11 4.7 Circular cylindrical compliance boundary determination case study with large antennas and no direct access 11 4.8 Tower case study in parkland 12 4.9 Multiple towers case study at sports venue 13 4.10 In-building base station case study 14 Annex A (info

14、rmative) Micro cell case study . 16 Annex B (informative) Roof-top case study with nearby apartments . 41 Annex C (informative) Roof-top / tower case study in residential area 68 Annex D (informative) Roof-top case study with direct access to antennas 98 Annex E (informative) Roof-top case study wit

15、h no direct access to antennas 126 Annex F (informative) Circular cylindrical compliance boundary determination case study 143 Annex G (informative) Tower case study in parkland 155 Annex H (informative) Tower case study at sports venue . 170 Annex I (informative) In-building base station case study

16、 . 191 Annex J (informative) Evaluation template and sample uncertainty table 212 Figure 1 Micro cell case study 7 Figure 2 Roof-top case study with nearby apartment buildings . 8 Figure 3 Roof-top / tower case study in residential area . 9 Figure 4 Roof-top case study with direct access to antennas

17、 . 10 Figure 5 Roof-top case study with large antennas and no direct access . 11 Figure 6 Cylindrical compliance boundary determination for dual band antenna on building . 12 Figure 7 Tower case study in parkland . 13 Figure 8 Multiple towers case study at sports venue 14 Figure 9 Office building IB

18、C case study . 15 TR 62669 IEC:2011(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ CASE STUDIES SUPPORTING IEC 62232 DETERMINATION OF RF FIELD STRENGTH AND SAR IN THE VICINITY OF RADIOCOMMUNICATION BASE STATIONS FOR THE PURPOSE OF EVALUATING HUMAN EXPOSURE FOREWORD 1) The International Electrotech

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30、t has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC 62669, which is a technical report, has been prepared by IEC technical committee 106: Methods for the assessment of electric, magnetic and electromagnetic

31、fields associated with human exposure. This publication contains attached files in the form of a CD-ROM for the paper version and embedded files for the electronic version. These files are intended to be used as a complement and do not form an integral part of the technical report. 4 TR 62669 IEC:20

32、11(E) The text of this technical report is based on the following documents: Enquiry draft Report on voting 106/199/DTR 106/208/RVC Full information on the voting for the approval of this technical report can be found in the report on voting indicated in the above table. This publication has been dr

33、afted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publi

34、cation will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the

35、 correct understanding of its contents. Users should therefore print this document using a colour printer. TR 62669 IEC:2011(E) 5 INTRODUCTION This technical report contains a series of case studies for the evaluation of electromagnetic (EM) sources in the frequency range 100 kHz - 300 GHz to suppor

36、t the methods detailed in the international standard IEC 62232, Determination of RF field strength and SAR in the vicinity of radiocommunication base stations for the purpose of evaluating human exposure. Using the methods detailed in the standard, each case study has been chosen to illustrate a typ

37、ical radio base station (RBS) evaluation scenario. 6 TR 62669 IEC:2011(E) CASE STUDIES SUPPORTING IEC 62232 DETERMINATION OF RF FIELD STRENGTH AND SAR IN THE VICINITY OF RADIOCOMMUNICATION BASE STATIONS FOR THE PURPOSE OF EVALUATING HUMAN EXPOSURE 1 Scope This technical report presents a series of c

38、ase studies in which electromagnetic (EM) fields are evaluated in accordance with IEC 62232. It also provides a reporting template cross referenced to IEC 62232. Each case study has been chosen to illustrate a typical radio base station (RBS) evaluation scenario and employs the methods detailed in I

39、EC 62232. Some of the case studies demonstrate more than one evaluation method. However, in most situations only one method would be required to complete an evaluation. The case studies documented in this report are provided for guidance only and are not a substitute for a thorough understanding of

40、the requirements of IEC 62232. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) appl

41、ies. IEC 62232: Determination of RF field strength and SAR in the vicinity of radiocommunication base stations for the purpose of evaluating human exposure 3 Terms, definitions, symbols and abbreviated terms For the purposes of this document, the terms, definitions, symbols and abbreviated terms giv

42、en in IEC 62232 apply. 4 Overview of case studies 4.1 Case study synopsis This clause provides a summary of worked evaluation examples at a number of RBS sites using a range of methods described in IEC 62232. The example sites include roof-tops, towers, poles, micro cells and in-building cells. The

43、case studies have been chosen to illustrate typical RBS sites and common evaluations. Some of the case studies demonstrate multiple evaluation methods. However in most situations only one method would be required to complete an evaluation. NOTE The coloured left-side page margins in the annexes indi

44、cates the pages are unchanged versions of sample RF exposure evaluation reports contributed by TC 106 project team members. TR 62669 IEC:2011(E) 7 4.2 Micro cell case study The purpose of this case study was to evaluate the RF exposure compliance boundaries from a particular micro cell installation

45、on a building wall to determine whether they would extend to a nearby awning. Compliance boundaries were determined based on a) basic restrictions and b) reference levels to determine the minimum distance from the antenna to the compliance boundary. The maximum values were compared against internati

46、onal safety guidelines known as ICNIRP (International Commission on Non-Ionizing Radiation Protection) guidelines. The assessment establishes compliance against the basic restrictions known as specific absorption rate (SAR) and the spatially averaged field strength reference levels. SAR testing was

47、performed in a laboratory and frequency selective field measurements were performed on site. The equipment under test (EUT) was categorised as a simple RBS due to the single technology and single antenna of the micro cell. Nearby base stations, known as secondary sources, had negligible impact on bo

48、th SAR and field strength evaluations. The measured SAR and field strength levels were extrapolated to assess the maximum power configuration for the site. The “best estimate” uncertainty model was applied and the measured levels are reported including the extrapolation for maximum base station powe

49、r configuration. The uncertainty is stated for all assessment methods used. The compliance boundary distance for general public exposure using the on-site field strength measurement was 0,8 m and 0,08 m using the SAR evaluation. Both the SAR evaluation and the on-site field strength measurements confirm that the general public exposure compliance boundary from the micro cell antenna does not extend onto the building awning, therefore access is permitted on the awning. Th