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Site validation method for microwave anechoic chamber
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Basic data
| Standard ID | GB/T 44073-2024 (GB/T44073-2024) |
| Description (Translated English) | Site validation method for microwave anechoic chamber |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | L06 |
| Word Count Estimation | 22,239 |
| Date of Issue | 2024-05-28 |
| Date of Implementation | 2024-12-01 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 44073-2024: Site validation method for microwave anechoic chamber
---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 33.100
CCSL06
National Standards of People's Republic of China
Method for confirming the site of microwave darkroom
Released on 2024-05-28
2024-12-01 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 Measurement methods 1
4.1 Overview 1
4.2 Measuring equipment 2
4.3 Measurement Setup 5
4.4 Measurement Step 6
4.5 Data Processing 7
4.6 Measurement uncertainty 8
5 Test Report 8
6 Darkroom Diagnosis 8
Appendix A (Informative) Derivation of the calculation formula for the quiet zone reflectivity level 9
Appendix B (Informative) Example of uncertainty evaluation of quiet zone reflectivity level measurement 10
Appendix C (Informative) Darkroom Imaging Technology 12
Reference 14
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 is proposed and coordinated by the National Radio Interference Standardization Technical Committee (SAC/TC79).
This document was drafted by. China Institute of Metrology, China Electronics Standardization Institute, Beijing Radio Metrology and Testing Institute,
Henan Institute of Measurement and Testing Science, China Electric Power Research Institute Co., Ltd., Jiangsu Provincial Electronic Information Product Quality Supervision and Inspection Research
Institute, Orto RF Technology (Shanghai) Co., Ltd., Beiqi Foton Motor Co., Ltd., China Automotive Engineering Research Institute Co., Ltd.,
Shenzhen Yanoxun Technology Co., Ltd.
The main drafters of this document are. Liu Xiao, Cui Qiang, Han Yufeng, Wang Weilong, Bai Bing, Ban Hao, Zhao Xing, Meng Donglin, Liu Wenfang, Wu Yanli, Li Zhipeng,
Fu Jun, Yang Zhichao, Huang Minchang, Zhu Mingxing, Shang Zhugang, Chen Zhengyu, Wang Nan, Gao Qixuan, Wang Zetang, Huang Xuemei, Huang Jiewu.
Method for confirming the site of microwave darkroom
1 Scope
This document describes the site validation method for microwave anechoic chambers in the frequency range of 700MHz to 110GHz.
This document is applicable to the performance confirmation of the quiet zone of the microwave anechoic chamber.
2 Normative references
The contents of the following documents constitute the 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/T 4365-2003 Electrical terminology - Electromagnetic compatibility
3 Terms and definitions
The terms and definitions defined in GB/T 4365-2003 and the following apply to this document.
3.1
A specially designed enclosed chamber designed to simulate free space.
Note. The indoor wall is paved with absorbing materials, which can fully absorb electromagnetic waves in the microwave frequency band, so that the limited area where the test piece is placed can reflect electromagnetic waves from all directions.
The signal level drops to an acceptable level.
3.2
Quiet Zone
The device under test is placed in a microwave darkroom, and the level of electromagnetic wave reflection signals from all directions is controlled to a limited area of the designed level.
3.3
The ratio of the equivalent reflected wave signal to the direct wave signal in the quiet zone of a microwave darkroom.
Note. Usually expressed in decibel (dB).
4 Measurement methods
4.1 Overview
Microwave darkroom simulates free space and is used in antenna measurement, target characteristic measurement and other fields, with the advantage of working around the clock.
Because the absorbing material cannot completely absorb electromagnetic waves, there will still be reflected waves in the dark room. These reflected waves enter from all directions.
The quiet zone is superimposed with the direct wave, as shown in Figure 1.A spatial standing wave distribution is formed on a certain travel line in the quiet zone, and this index is characterized by the quiet zone reflectivity.
When a microwave anechoic chamber is used to measure parameters such as antenna radiation pattern, the reflectivity level of the quiet zone at different angles in the chamber should be evaluated.
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