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GB/T 44645-2024: Measurement method for shielding effectiveness of electromagnetic shielding materials under the excitation of high power microwave
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Measurement method for shielding effectiveness of electromagnetic shielding materials under the excitation of high power microwave
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GB/T 44645-2024
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Basic data | Standard ID | GB/T 44645-2024 (GB/T44645-2024) | | Description (Translated English) | Measurement method for shielding effectiveness of electromagnetic shielding materials under the excitation of high power microwave | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | F74 | | Classification of International Standard | 17.240 | | Word Count Estimation | 26,274 | | Date of Issue | 2024-09-29 | | Date of Implementation | 2026-10-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 44645-2024: Measurement method for shielding effectiveness of electromagnetic shielding materials under the excitation of high power microwave
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 17.240
CCSF74
National Standard of the People's Republic of China
Electromagnetic shielding materials High power microwave shielding effectiveness
Measurement method
Released on 2024-09-29
2026-10-01 implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 General requirements 2
4.1 General 2
4.2 Measurement conditions 2
4.3 Requirements for tested materials 2
5 Narrowband High Power Microwave Shielding Effectiveness Measurement 3
5.1 Measurement system and equipment 3
5.2 Measurement Layout 6
5.3 Measurement steps 6
6 Wide (ultra-wide) band high power microwave shielding effectiveness measurement 7
6.1 Measurement systems and equipment 7
6.2 Measurement layout 10
6.3 Measurement steps 10
7 Safety and Protection11
7.1 High voltage protection 11
7.2 Radiation protection 11
7.3 Safety Warning 11
7.4 Darkroom Safety Protection 11
8 Test Report 11
Appendix A (Normative) Shielded dark box structure 12
Appendix B (Informative) Microwave Frequency Measurement 13
Appendix C (Normative) Attenuation value calibration of transmission lines and attenuators under narrowband high power microwaves 14
Appendix D (Normative) Detector dynamic range calibration 15
Appendix E (Informative) Analysis of uncertainty in shielding effectiveness measurement 16
Appendix F (Normative) Attenuation coefficient calibration of transmission lines and attenuators for wide (ultra-wide) band high power microwaves 18
Appendix G (Informative) High Power Microwave Shielding Effectiveness Measurement Record 19
Reference 21
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Electrical Equipment Industry Association.
This document is under the jurisdiction of the National Technical Committee for Standardization of Electromagnetic Shielding Materials (SAC/TC323).
This document was drafted by. Institute of Applied Electronics, China Academy of Engineering Physics, Shanghai Institute of Metrology and Testing Technology, Maxim New Materials
Materials Co., Ltd., Jiangsu Quality and Standardization Research Institute, Northern Engineering Design and Research Institute Co., Ltd., China Electronics Cosine Technology Co., Ltd.
Ltd., Beijing Huayu Xinao Technology Co., Ltd., Institute of Metal Research, Chinese Academy of Sciences, Chengdu Moore Huanyu Testing Technology Co., Ltd., Beijing
Beijing Radio Measurement and Testing Institute, Huawei Terminal Co., Ltd., University of Electronic Science and Technology of China, China Institute of Metrology, Harbin Institute of Technology,
Anhui Normal University, Jiangsu Institute of Metrology (Jiangsu Energy Metrology Data Center), Jiangsu Zhongdi New Materials Technology Co., Ltd., Tianjin
Nuo Optoelectronic Materials Co., Ltd., Anfang High-tech Electromagnetic Safety Technology (Beijing) Co., Ltd., Tianjin University, Shenzhen Feirongda Technology Co., Ltd.
Ltd.
The main drafters of this document are. Ma Hongge, Qin Feng, Xiao Tian, Chen Chaochan, Yan Zhiyang, Chen Weibin, Zhu Jiangang, Yu Xiaolei, Zhao Zhanliang, Guo Rongbin,
Gao Cheng, Ma Song, Chen Nan, Han Yufeng, Yu Zhigang, Li En, Gao Yuan, Huang Pan, Lu Zhengang, Liu Xiaoming, Zhao Pinzhang, Liu Weide, Zhu Yanyan, Cai Jinliang,
Yang Hong, Wang Zhen, Lai Lei, Wu Fan, Shi Weiwei, Gao Yong, Zhao Rui, Zhang Hong, Wu Zhuang.
Electromagnetic shielding materials High power microwave shielding effectiveness
Measurement method
1 Scope
This document describes the measurement method, safety and performance of high power microwave shielding effectiveness of electromagnetic shielding materials in the frequency range of 100MHz~40GHz.
Protection and test report contents.
This document is applicable to the measurement of high-power microwave shielding effectiveness of planar electromagnetic shielding materials.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB 8702 Electromagnetic environment control limits
GB 18871 Basic Standard for Ionizing Radiation Protection and Radiation Source Safety
GB/T 26667-2021 Terminology of electromagnetic shielding materials
GB/T 30142 Measurement method for shielding effectiveness of planar electromagnetic shielding materials
GB 50826 Technical Specification for Electromagnetic Anechoic Chamber Engineering
3 Terms and definitions
The terms and definitions defined in GB/T 26667-2021 and GB/T 30142 and the following apply to this document.
3.1
High power microwave high power microwave; HPM
Strong electromagnetic radiation with a frequency of 100MHz~300GHz, a peak power greater than 100MW or an average power greater than 1MW.
Note. The high power microwave frequency range described in this document is 100MHz~40GHz, including narrowband high power microwave, broadband high power microwave, ultra-wideband high power microwave,
Rate microwave.
3.2
relative bandwidth
The ratio of the signal bandwidth to its center frequency is calculated according to formula (1).
FRB=
fH-fL
fH fL()/2
×100% (1)
Where.
FRB---relative bandwidth;
fH ---The highest frequency corresponding to the microwave pulse power spectrum density decreasing by 3dB relative to the peak power spectrum density, in gigahertz
Hertz (GHz);
fL ---The lowest frequency corresponding to the microwave pulse power spectrum density decreasing by 3dB relative to the peak power spectrum density, in gigahertz
Hertz (GHz).
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