Microwave anechoic chamber, microwave absorbing chamber, radio anechoic chamber.Whenelectromagnetic waveWhen incident on the wall, ceiling and ground, most of the electromagnetic waves are absorbed, while the transmission and reflection are very little.Microwave also has some characteristics of light. It is called microwave anechoic chamber by virtue of the meaning of optical anechoic chamber.Microwave anechoic chamber is a special room composed of microwave absorbing materials and metal shields, which provides artificially open "free space" conditions.Testing antenna, radar and other wireless communication products and electronic products in the darkroom can avoid clutter interference and improve the testing accuracy and efficiency of the tested equipment.With the development of electronic technology, microwave anechoic chamber is understood and applied by more people.Microwave darkroom is usedWave absorbing materialTo create a closed space, so that a pure electromagnetic environment can be created in the darkroom.
Microwave anechoic chamber materials can be all kinds of microwave absorbing materials, the main material is polyurethane wave absorbing sponge SA (for high-frequency use). In addition, when testing electromagnetic compatibility of electronic products, ferrite wave absorbing materials will also be used because the frequency is too low.
The main working principle of the microwave anechoic chamber is to use the high permeability based on the law of electromagnetic wave propagation in the medium from the direction of low magnetism to high permeabilityWave absorbing materialGuide electromagnetic wave, absorb a large amount of radiation energy of electromagnetic wave through resonance, and then passcouplingConvert the energy of electromagnetic waves into heat energy.
Scope of application
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The microwave anechoic chamber is mainly used for the measurement of radiated radio disturbance (EMI) and radiation sensitivity (EMS). The size of the microwave anechoic chamber and the selection of RF absorbing materials are mainly determined by the overall size and test requirements of the equipment under test (EUT).
main performance
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Frequency range: 30MHz~18GHz Wave absorbing material Reflection loss: 30MHz~18GHz ≥ 15dB (wave absorbing material is composite wave absorbing material, that is, conical carbon sponge wave absorbing material is pasted on ferrite)
Structure composition
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Shield room:It is composed of shield shell, shield door, ventilation waveguide window and various power filters.The shielding shell is usually welded.
Wave absorbing material：Single layer ferrite sheet, operating frequency range 30MHz - 1000MHz;Conical carbon sponge absorbing material: the conical carbon sponge absorbing material is composed ofPolyurethane foamIt is permeated in carbon glue solution.It has good flame retardancy.
Microwave anechoic chamber
other:It mainly includes signal transmission board, turntable, antenna, monitoring system, etc
