HOME   Cart(0)   Quotation   About-Us Tax PDFs Standard-List Powered by Google www.ChineseStandard.net Database: 189759 (9 Feb 2025)

GB/T 44073-2024 English PDF

GB/T 44073-2024_English: PDF (GB/T44073-2024)
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 44073-2024English459 Add to Cart 4 days [Need to translate] Site validation method for microwave anechoic chamber Valid GB/T 44073-2024


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 22,266
Date of Issue 2024-05-28
Date of Implementation 2024-12-01
Administrative Organization National Technical Committee for Radio Interference Standardization (SAC/TC 79)
Proposing organization National Technical Committee for Radio Interference Standardization (SAC/TC 79)
Issuing agency(ies) State Administration for Market Regulation, National Standardization Administration


GB/T 44073-2024. Microwave darkroom site confirmation method 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 Range 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 Preface 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. ......

Similar standards: GB/T 44119-2024  GB/T 44182-2024  
Similar PDFs (Auto-delivered in 9 seconds): GB/T 43248-2023  GB/T 40309-2021  GB/T 38889-2020  GB/T 38659.1-2020