GB/T 40602.2-2021Antennas and reception systems for radio interference—Part 2:Basic measurement—Method for near field measuring high gain antenna pattern in microwave anechoic chamber (English PDF)
天线及接收系统的无线电干扰 第2部分：基础测量 高增益天线方向图室内平面近场测量方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 11, 2021
Implementation date
May 1, 2022
Scope
GB/T 40602.2-2021 is the English-translated version of 天线及接收系统的无线电干扰 第2部分：基础测量 高增益天线方向图室内平面近场测量方法.
GB/T 40602.2-2021 describes how to measure the radiation pattern of high-gain antennas in a microwave anechoic chamber by planar near-field scanning. It applies to antennas with a gain of at least 15 dBi and a maximum measurement angle of up to 60°.
The document covers the measurement conditions, including the state of the antenna under test and the coordinate system, the environment, power supply and site, and the measuring system with its mechanical, radio frequency and control subsystems and software.
It then gives the measurement method, parameters and steps, data analysis, the way patterns are represented, the uncertainty analysis, the measurement report and safety protection.
Annexes explain near-to-far field conversion, pattern representation and uncertainty evaluation. It was issued on 11 October 2021 and has applied since 1 May 2022.
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Document preview — GB/T 40602.2-2021
National Standard of the People's Republic of China
- ICS
- 33.120.40
- Classification
- L 06
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Measurement conditions
- 4.1 Overview
- 4.2 Tested antenna status
- 4.3 Coordinate system
- 5 Measuring environment
- 5.1 Measurement environment requirements
- 5.2 Power requirements
- 5.3 Measurement site requirements
- 6 Measuring system
- 6.1 System block diagram
- 6.2 Mechanical subsystem
- 6.3 Radio Frequency Subsystem
- 6.4 Control subsystem
- 6.5 Measurement software
- 7 Measurement method
- 7.1 Basic theory
- 7.2 Measurement implementation
- 7.3 Measurement parameters
- 7.4 Measurement steps
- 7.5 Data analysis
- 7.6 Representation method of radiation pattern
- 7.7 Analysis of measurement uncertainty
- 8 Measurement report
- 8.1 Measurement report requirements
- 8.2 Output of measurement results
- 9 Security
- 9.1 Safety protection requirements
- 9.2 Safety protection measures
- Appendix A (informative) Near-to-far field conversion method
- Appendix B (informative) Radiation pattern representation
- Appendix C (Informative) Explanation of Measurement Uncertainty Evaluation
- Reference
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 of Standardization Documents" Drafting.
This document is part 2 of GB/T 40602 "Radio Interference from Antennas and Receiving Systems". GB/T 40602 has been released to Lower part.
---Part 1: Basic indoor far-field measurement method of antenna pattern;
---Part 2: Basic measurement method for indoor planar near-field measurement of high-gain antenna pattern.
Certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
Introduction
The radio interference of the antenna and the receiving system is based on the "antenna" (invisible antenna-wireless receiving system) as the entry point to establish the antenna and the radio The electromagnetic compatibility standard of the receiving system covers antennas, measurement sites and wireless receiving systems.
GB/T 40602 "Radio Interference from Antennas and Receiving Systems" is intended to be composed of the following parts.
---Part 1: Basic indoor far-field measurement method of antenna pattern. The purpose is to specify the antenna radiation pattern (below Radiation pattern for short) is a method of measuring the elevated far field in a microwave anechoic chamber.
---Part 2: Basic measurement method for indoor planar near-field measurement of high-gain antenna pattern. The purpose is to specify high-gain antennas Planar near-field scanning method is a method for measuring the antenna pattern in a microwave anechoic chamber.
---Part 3: Field measurement method to confirm the performance of the compact field. The purpose is to specify the tight field shielding effectiveness, static field radiation characteristics Measurement methods for performance, phase characteristics, and cross-polarization performance.
---Part 4: The electromagnetic compatibility test method of the integrated radio module electronic equipment of the wireless receiving system. The purpose is to provide for EMC testing requirements and testing methods for electronic equipment with integrated wireless modules such as industrial, scientific, medical, automotive, and household appliances.
The above four parts and the previously published GB/T 38889-2020 on vehicle antennas and systems together form the antenna and receiving system. A unified radio interference standard system.
1 Scope
This document describes how to measure the antenna pattern (hereinafter referred to as the pattern) in a microwave anechoic chamber using the planar near-field scanning method of a high-gain antenna.
This document is applicable to the measurement of antenna pattern with gain >= 15dBi and maximum measurement angle <= 60°.
2 Normative references
The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.
GB 8702-2014 Electromagnetic environment control limits
GB/T 14733.10-2008 Telecom Terminology Antenna
3 Terms and definitions
The following terms and definitions defined in GB 8702-2014 and GB/T 14733.10-2008 apply to this document.
3.1 Near-field measurement
Measurements made in the near-field area of the antenna under test.
3.2 Coordinate system
A system including antenna coordinate system, turntable coordinate system, and site coordinate system.
Note 1. Generally, the antenna coordinate system is selected as the measurement coordinate system. If another coordinate system is selected, it needs to be transformed from the antenna coordinate system to another measurement or working coordinate system As long as their relative orientation and location are known.
Note 2. With this coordinate system, the measured antenna parameters have nothing to do with the installation or orientation of the antenna.
3.3 Linearly-polarized antenna
In the direction of maximum gain, it can be used as an antenna that radiates linearly polarized electromagnetic waves when transmitting, or when receiving, the antenna terminal can obtain the maximum available power.
The direction of the incoming rays polarizes the electromagnetic wave of the antenna.
3.4 Circularly-polarized antenna
In the direction of maximum gain, it can be used as an antenna that radiates circularly polarized electromagnetic waves when transmitting, or when receiving, the antenna terminal can obtain the maximum available power.
The direction of the rate of incidence of circularly polarized electromagnetic waves of the antenna.
3.5 Radiation pattern
Characterize the distribution of antenna radiation in space.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 23 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB 8702-2014 — Controlling limits for electromagnetic environment
GB/T 40602.1-2021 — Antennas and reception systems for radio interference—Part 1: Basic measurement—Method for far field measuring in microwave anechoic chamber
GB/T 40602.3-2023 — Antennas and reception systems for radio interference—Part 3: Test site measurement—Performance test method of compact range
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