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Microwave anechoic chamber construction and classification

2021-02-13 653
A professional company that designs, develops, and manufactures high-performance, low-cost microwave radio frequency products. Its products are widely used in military and communications fields. Able to provide rich products from 1MHz to more than 36GHz. Mainly include low microwave radio frequency, medium and low power RF amplifiers, waveguide amplifiers, mixers, power splitters/combiners, directional couplers, frequency multipliers, frequency dividers, frequency converters, filters, detectors, switches, etc. Wait. And can provide customers with various customized solutions. Microwave radio frequency products-Yachi Industry (Shanghai) Co., Ltd.
Microwave darkroom construction

The system is equipped with feature-rich measurement and analysis software. Its main functions include: multi-frequency and multi-channel test functions; able to analyze antenna pattern parameters, such as beam width, null depth, null position, side lobe position and level, Axial ratio, phase center, etc.; can analyze the pattern of each section of the antenna and three-dimensional pattern; can analyze the directionality of the antenna, antenna gain; can diagnose the failure element of the array antenna, the amplitude and phase error, and the field distribution of the antenna port.

Microwave anechoic chamber construction-basic classification of microwave anechoic chamber:

Microwave anechoic chamber construction and classification

1. EMC anechoic chamber
The electric wave anechoic chamber is also called the electric wave anechoic room or the electric wave non-reflective room. It is based on a shielded room made of metal materials, and an electric wave absorber is installed on the inner wall to prevent external electromagnetic interference from entering the room without the influence of the inner wall reflection. It is an ideal test site for electromagnetic compatibility testing. Its advantage is that it can simulate free space conditions without reflection and electromagnetic pollution. The electromagnetic compatibility test is a means to verify the rationality of the electromagnetic compatibility design of electronic equipment and ultimately evaluate the quality of electronic equipment. In order to scientifically evaluate the electromagnetic compatibility of electronic equipment, it is necessary to quantitatively measure the interference emission, interference transmission characteristics and the interference sensitivity of electronic equipment of various interference sources. Through quantitative determination, it is possible to identify whether the product meets electromagnetic compatibility standards or specifications; to find out the weak links in electromagnetic compatibility in the product design and production process, and to provide users with relevant data for installing and using the product. Therefore, electromagnetic compatibility testing is an indispensable and important link in the development and production of electronic equipment.

2. Antenna test chamber
The antenna test chamber adopts an all-metal double-layer shielding structure, and the size of the shielding shell is: 25m×15m×15m. The length of the absorbing material installed on the inner wall is up to 1.6m, the low frequency absorbing performance is good, and the upper working frequency band can reach 40GHz. The internally installed automatic antenna test system can efficiently complete: antennas (including passive single-aperture antennas, passive array antennas, active phased array antennas, etc.) planar near-field measurement, cylindrical near-field measurement and far-field transmission and reception The interchangeable two-way measurement can also be used for pulse antenna measurement. The effective scanning range of the planar near-field measurement is up to 9m×9m.
Introduction to the construction of microwave anechoic chambers-under normal circumstances, when ignoring the path attenuation of microwaves, it can be considered that the quietness of the anechoic chamber is mainly determined by the reflection performance of the front absorbing material when it is perpendicularly incident. That is to say, when the quietness of the microwave anechoic chamber is better than -38dB at the lower limit of the frequency, it is required that the reflection performance of the front absorbing material at normal incidence is better than -38dB. Therefore, the front of the microwave anechoic chamber, the end wall facing the transmitting antenna and the other four sides of the Fresnel zone use WX-1500 absorbing materials; the selection and layout of other absorbing materials use WX-1200 absorbing materials on the wall.
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