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GB/T 21195-2007: The specifications of antenna for mobile communication indoor distributed system
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| GB/T 21195-2007 | English | 369 |
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The specifications of antenna for mobile communication indoor distributed system
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GB/T 21195-2007
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PDF similar to GB/T 21195-2007
Standard similar to GB/T 21195-2007 JT/T 808 JT/T 1078 GB/T 19392 GB/T 37657 Basic data | Standard ID | GB/T 21195-2007 (GB/T21195-2007) | | Description (Translated English) | The specifications of antenna for mobile communication indoor distributed system | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | M51 | | Classification of International Standard | 33.120.40 | | Word Count Estimation | 14,131 | | Date of Issue | 2007-11-14 | | Date of Implementation | 2008-05-01 | | Regulation (derived from) | China Announcement of Newly Approved National Standards No. 12 of 2007 (No. 112 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard provides mobile communications antenna indoor signal distribution system terminology and definitions, classifications, electrical properties, mechanical properties, environmental conditions, measurement methods, inspection rules and signs, packaging, transport and storage. This standard applies to working frequency of 806MHz ~ 880MHz, 885MHz ~ 960MHz, 1710MHz ~ 1880MHz, 1880MHz ~ 1920MHz, 1920MHz ~ 2170MHz, 2300MHz ~ 2400MHz mobile communication indoor signal distribution system antenna. Other bands of the same type, size of the antenna can also refer to the use. | GB/T 21195-2007: The specifications of antenna for mobile communication indoor distributed system---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.
National Standards of People's Republic of China
GB/T 21195-2007
Mobile Communication Indoor Signal Distribution System
Antenna Specifications
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Issued by the Standardization Administration of China
1 Scope
This standard specifies the terms and definitions, classification, electrical performance, mechanical characteristics, environmental conditions,
Measurement methods, inspection rules and marking, packaging, transportation and storage.
This standard applies to the working frequency bands of 806MHz~880MHz, 885MHz~960MHz, 1710MHz~1880MHz,
1880MHz~1920MHz, 1920MHz~2170MHz, 2300MHz~2400MHz mobile communication indoor signal distribution system
system antenna. Antennas with other frequency bands and specifications of the same type can also be used as a reference.
2 Normative references
The clauses in the following documents become the clauses of this standard through the reference of this standard. For dated references, all subsequent
Amendments (not including errata content) or revised editions do not apply to this standard, however, encourage the parties to the agreement based on this standard to study
Whether the latest versions of these files are available. For undated references, the latest version applies to this standard.
4 categories
4.1 Indoor omnidirectional ceiling antenna.
4.2 Indoor directional ceiling antenna.
4.3 Indoor directional wall-mounted antenna.
4.4 Indoor directional narrow beam antenna.
5 requirements
5.1 Electrical performance requirements
5.1.1 Electrical performance requirements for indoor omnidirectional ceiling antennas (see Table 1).
5.1.2 Electrical performance requirements for indoor directional ceiling antennas (see Table 2).
5.1.3 Electrical performance requirements for indoor directional wall-mounted antennas (see Table 3).
5.1.4 Electrical performance requirements for indoor directional narrow beam antennas (see Table 4).
5.1.5 Lightning protection performance requirements. direct grounding.
5.2 Requirements for mechanical properties
5.2.1 General structural requirements. The antenna structure should be firm and reliable, easy to install, use and transport.
5.2.2 The antenna surface is clean, free from deformation, burrs and scars.
5.3 Environmental Condition Requirements
5.3.1 Ambient temperature. working temperature -30℃～+45℃;
Storage temperature -40℃～+55℃.
5.3.2 It has the ability to prevent salt spray, humidity and sulfur dioxide in the atmosphere.
6 Measurement method
6.1 Far field test
Antenna gain, half-power beam width, and front-to-back ratio can be measured by far-field or near-field test methods. This standard only describes the most commonly used
far-field testing method.
6.2 Gain measurement
6.2.1 See Figure 1 for the measurement block diagram.
6.2.2 Measurement conditions
6.2.2.1 The antenna under test has the same polarization as the source antenna.
6.2.2.3 The antenna under test is installed in an area where the field strength is basically uniform.
If the peak-to-peak value of the electric field change exceeds 1.5dB, the test site is considered unusable. In addition, gain base
The field strength difference measured by the quasi-antenna on two orthogonally polarized planes is not greater than 1dB.
6.2.2.4 Measurement equipment and instruments such as signal generators and receivers for measurement shall have good stability, reliability, dynamic range and measurement
Accuracy to ensure the correctness of the measurement data.
6.2.3 Measurement steps
When starting the measurement, the antenna under test and the gain reference antenna must be adjusted alternately for horizontal and vertical adjustments to ensure that each antenna is
The best pointing upward, so that the received power level is the largest.
The measurement steps are as follows.
a) The gain reference antenna is aligned with the maximum radiation direction of the same polarization of the source antenna, and the gain reference antenna is connected to the receiver through switching
Then, the receiving power level of the receiver is P1 (dBm);
b) The antenna under test is aligned with the maximum radiation direction of the same polarization of the source antenna, and the antenna under test is connected to the receiver through switching. At this time,
The receiving power level of the receiver is P2 (dBm);
c) Repeat steps a) and b) until the repeatability of P1 and P2 measurements reaches an acceptable level;
d) The gain G of a certain frequency point of the antenna under test is calculated according to formula (2).
6.3 Measurement of pattern circularity (omnidirectional antenna), half-power beam width, and front-to-back ratio
6.3.1 See Figure 2 for the measurement schematic diagram.
6.3.2 Measurement conditions meet 6.2.2.
6.3.3 Measurement steps
a) Erection of the antenna under test before the test.
The test turntable has at least 2 free rotation axes. the azimuth axis at the top and the pitch axis at the bottom, and the pitch axis rotates down or up
When the azimuth is aligned with the direction of the source antenna; there are three situations for antenna erection.
1) Vertical pattern test. the source antenna is installed with horizontal polarization, and the antenna under test is also installed with horizontal polarization;
2) θ=90° cutting plane pattern test. the source antenna is installed with vertical polarization, and the antenna under test is also installed with vertical polarization;
3) θ=120° cutting plane pattern test. the source antenna is installed with vertical polarization, the antenna under test is also installed with vertical polarization, and the test turns
The pitch axis of the platform is tilted up by 30° (that is, from the default initial θ=90° to θ=120°);
b) For the above three cases, the antenna under test rotates 360 degrees on the azimuth axis on the test turntable, and the received level is regarded as the angle
Record the function of the antenna to get the antenna pattern F(θ), record the half-power beam width θ1 of the antenna, and the maximum receiving level P3 in the forward direction,
The maximum receiving level P4 within the range of 180°±30° backward, and the minimum receiving level P5 omnidirectionally;
c) Measurement results.
6.4 Measurement of standing wave ratio
6.4.1 See Figure 3 for the measurement block diagram.
6.4.2 Measurement conditions
The antenna under test is installed in a relatively free space or echo-free dark space that is relatively free from reflection and far enough away from the test equipment and test personnel.
room. The methods for verifying the eligibility of the test site are as follows.
The antenna under test moves at least half a wavelength in each direction, and the maximum change of the standing wave ratio within the moving range is not greater than 0.1.
6.4.3 Measurement procedure
a) The test site meets 6.4.2;
b) Perform system calibration according to the measurement system requirements;
c) Connect the measurement system to the antenna under test, and measure the standing wave ratio within the operating frequency range. The antenna standing wave ratio is the working frequency
The worst value of standing wave ratio of each frequency point in the band.
6.5 Intermodulation measurement
6.5.1 Measurement block diagram
The intermodulation measurement uses the "passive intermodulation test equipment" of the corresponding frequency band for testing, and the reflection frequency sweep test is used. The measurement block diagram is shown in Figure 4.
6.5.2 Measurement conditions
6.5.2.1 Meet 6.4.2.
6.5.2.2 The non-echo absorber cannot be placed in the near-field of the antenna induction, so as to ensure that the induced echo in the absorber does not generate intermodulation. Also ensure
The same polarization gap between absorbers does not produce leakage.
6.5.2.3 The residual intermodulation of the test cable is less than -117dBm, and the VSWR of both ports of the test cable is less than 1.2.
6.5.3 Measurement procedure
a) Set the working frequency so that the third-order intermodulation products fall within the working frequency band;
b) Adjust the output power so that the power of the two carriers on the test port is 20dBm;
c) perform system calibration;
d) The antenna under test is connected to the test port, and the intermodulation level is read out.
6.6 Power margin measurement
6.6.1 Measurement conditions
6.6.2 Measurement steps
The antenna under test is connected to the RF signal source under specified conditions, and the continuous wave power of the specified frequency is applied to the antenna under test for a duration of
1h, the antenna should not be damaged or damaged, and its standing wave ratio meets the requirements of this standard.
6.7 Test methods for general structural requirements
The antenna structure can be inspected by checking calculation, visual inspection and mechanical methods to verify whether the material, external dimensions and structural design and processing are
meet the requirements.
6.8 Environmental test methods
7 Inspection rules
7.1 Inspection classification
Product inspection is divided into two types. type inspection (routine inspection) and ex-factory inspection (delivery inspection).
7.1.1 Type inspection
Carry out a comprehensive inspection of the various indicators specified in the product technical conditions, usually once every two years. When one of the following situations occurs
Type inspection must be carried out.
a) Trial type identification of new products or old products transferred to factory;
b) After formal production, if there are major changes in structure, materials, and processes, which may affect product performance;
c) When the product has been discontinued for a long time and production is resumed;
d) When there is a large difference between the factory inspection result and the previous type inspection;
e) When the national or industry quality supervision organization deems it necessary.
The type inspection adopts a sampling plan according to GB/T 2829.shape = 3, Ac = 0, Re = 1, discrimination level III, unqualified quality level
(RQL) is 65.
7.1.2 Factory inspection
7.1.2.1 The ex-factory inspection items shall be carried out according to the provisions in Table 6.
7.1.2.2 Sampling method is used for factory inspection, and the sampling plan for one-time normal inspection in GB/T 2828.1 is used for sampling.
7.1.2.3 Product quality is represented by the number of unqualified products. If any item of any sample is unqualified in the inspection, the sample unit shall be judged as unqualified.
Qualified product.
8 Marking, packaging, transportation and storage
8.1 Signs
Products should have product logos and packaging logos.
8.1.1 Product marking
There should be a nameplate on the antenna, the basic content of which is.
a) manufacturer's name;
b) product name;
c) trademarks;
d) product model;
e) date of manufacture;
f) frequency band, gain;
g) Inspection marks.
8.1.2 Outer packaging marks
Should comply with the relevant provisions of GB/T 191.
8.2 Packaging
8.2.1 Packaging requirements
The basic content should comply with the relevant provisions of GB/T 3873.
8.2.2 Documents accompanying the product
a) product certificate;
b) product manual;
c) packing list;
d) list of accessories;
e) installation drawing;
f) Other relevant technical information.
8.3 Transportation
The antenna should avoid large vibration and collision during transportation, and should abide by the marking regulations on the outside of the box.
8.4 Storage
The packaged products should be placed in a ventilated and dry warehouse without acid, alkali and other corrosive gases in the surrounding air. Storage period
The storage period does not exceed two years, and the storage period exceeds two years, and it needs to be re-measured, and it can be used only after passing the inspection.
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