Microwave anechoic chamber

Microwave anechoic chamber

    The microwave anechoic chamber is mainly used to detect the radiation or scattering performance of the specimen to be tested, which is mainly divided into far-field anechoic chamber (including the compact field, which is mainly used for RCS detection), planar near-field anechoic chamber, cylindrical near-field anechoic chamber and spherical near-field anechoic chamber. Generally, large-scale radar antennas are used for near-field testing, and wide-wave speed antennas generally use spherical near-field and cylindrical near-field testing, and with the improvement of test requirements, the demand for multi-functional anechoic chambers (including near-field, far-field and EMC testing and integration) is gradually expanding.

    Through the construction of the project, the electromagnetic environment and test conditions required for the electromagnetic compatibility test of the tested equipment are provided, which can effectively eliminate the interference of external electromagnetic waves and various reflected interference, so as to obtain reliable and standardized test data, and the main purpose is to carry out the compliance test of radiated emission and immunity.

Citation:

 GB50826-2012 Technical Code for Electromagnetic Anechoic Chamber Engineering

 GB/T12190-2006

 GB/T50719-2011

 GB50017—2003 Code for Design of Steel Structure

 GB50009—2012 Code for Loading of Building Structures

 GB50205—2001 Code for Acceptance of Construction Quality of Steel Structure Engineering

 GB50034-2013 Code for Architectural Lighting Design

 GB50052-2009 Code for Design of Power Supply and Distribution System

 GB50019-2015 Code for Design of Heating, Ventilation and Air Conditioning in Industrial Buildings

 GB50116-2013 Code for Design of Automatic Fire Alarm System

 GB4717-2015

 GB50016-2010 Code for Fire Protection Design of Buildings

 GB50057-2010 Code for lightning protection design of buildings

 GB/T2406-93

 GB8624-2012

 GJB6780-2009 "Microwave Anechoic Chamber Performance Test Method"

 GJB5239-2004 Test Method for Absorption Performance of RF Absorbing Materials

Microwave anechoic chamber performance requirements

The performance of the anechoic chamber is tested by an independent third-party organization, and the main test indicators are shielding effectiveness, quiet zone performance, field average operation, and cross-polarization level.

Shielding efficiency index: meet the EN50147-1, GB/T 12190-2006 standard.

The performance of the quiet zone is determined by the DUT and the test requirements, which affects the measurement accuracy of the DUT.

Uniform field includes longitudinal field width uniformity, which is generally ≤± 2dB

                    Transverse field width uniformity, generally ≤± 0.25dB

                    Cross-polarization level, typically ≤ 25dB

Microwave anechoic chamber specifications

Planar near-field: It can test radar antennas with large volume and narrow wave velocity.

Cylindrical near-field: It can test large antennas with wide wave speeds.

Spherical near-field: 3D pattern test with wide wave velocity, such as ordinary base station antennas, 5G antennas, etc.

Compact field: It can be used for stealth characteristic test and far-field test.

Ordinary far-field: mainly for the test of not too large DUTs.

Simulation chamber: Simulation target characteristic measurement.

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