1、 IEC 62431Edition 1.0 2008-07INTERNATIONAL STANDARD Reflectivity of electromagnetic wave absorbers in millimetre wave frequency Measurement methods IEC 62431:2008(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.THIS PUBLICATION IS CO
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9、MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.IEC 62431Edition 1.0 2008-07INTERNATIONAL STANDARD Reflectivity of electromagnetic wave absorbers in millimetre wave frequency Measurement methods INTERNATIONAL ELECTROTECHNICAL COMMISSION XAICS 19.0
10、80;17.120;29.120.10 PRICE CODEISBN 2-8318-9895-1 Registered trademark of the International Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 62431 IEC:2008(E)CONTENTS FOREWORD.5 1 Scope.7 2 Normative referen
11、ces.7 3 Terms,definitions and acronyms.7 3.1 Terms and definitions.7 3.2 Acronyms and symbols.10 4 Specimen.12 4.1 Specimen specification.12 4.2 Reference metal plate.12 4.2.1 Material and thickness.12 4.2.2 Surface roughness.12 4.2.3 Flatness.12 4.2.4 Size and shape.12 4.3 Reference specimen for ca
12、libration.12 5 Specimen holder.13 6 Measurement equipment.13 6.1 Type of network analyzer.13 6.2 Antenna.13 6.2.1 Horn antenna.13 6.2.2 Lens antenna.13 6.3 Amplifier.13 6.4 Cable.14 7 Measurement condition.14 7.1 Temperature and environment.14 7.2 Warming up of measurement equipment.14 7.3 Electroma
13、gnetic environment.14 8 Calibration of measurement system and measurement conditions.14 8.1 Calibration of measurement system.14 8.2 Measurement conditions.14 8.2.1 Dynamic range.14 8.2.2 Setting up of the network analyzer for keeping adequate dynamic range.14 9 Horn antenna method.15 9.1 Measuremen
14、t system.15 9.1.1 Configuration of the measurement system.15 9.1.2 Horn antenna.16 9.1.3 Specimen holder.16 9.1.4 Mounting of the specimen.18 9.1.5 Antenna stand.18 9.2 Measurement conditions.18 9.2.1 Measurement environment.18 9.2.2 Measuring distance.18 9.2.3 Size of specimen.18 9.3 Measurement pr
15、ocedures.19 10 Dielectric lens antenna method focused beam method.20 10.1 Outline.20 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.62431 IEC:2008(E)3 10.2 Measurement system.20 10.2.1 Transmitting and receiving antennas.20 10.2.2 Foc
16、used beam horn antenna.21 10.2.3 Specimen size.22 10.2.4 Reference metal plate size.22 10.2.5 Specimen holder.22 10.2.6 Method of fixing the specimen and the reference metal plate.23 10.3 Measurement procedures.23 11 Dielectric lens antenna method parallel beam method.25 11.1 Principle.25 11.1.1 Outline.25 11.1.2 Parallel EM wave beam formed using a EM wave lens.25 11.2 Measurement system.26 11.2.1 Composition of measurement system.26 11.2.2 Dielectric lens antenna.29 11.3 Specimen.29 11.3.1 Gen
