What is the design method of electric wave dark room?_Century Wisdom (Suzhou) Testing Technology Co., Ltd

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What is the design method of electric wave dark room?

Release time:

2022-12-02 10:31

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What is the design method of a radio wave darkroom?

Radio wave darkroom is a closed shielded room, mainly used to simulate the open field and measure the radio harassment (EMI) and radiation sensitivity (EMS) of radiation. The size of the radio wave darkroom and the choice of RF absorbing material mainly depends on the size of the outgoing line and EUT test requirements, divided into 1m method, 3m method or 10m method, then the radio wave darkroom: what is the design method of the radio wave darkroom?

Electric wave darkroom: what is the design method of electric wave darkroom?

1. Generally speaking, the electric wave darkroom is used for radiation testing. There are three kinds of test sites: full anechoic chamber, semi-anechoic chamber and open space. In general, radiation tests conducted in these three test sites can be considered to be in line with the laws of electromagnetic wave propagation in free space.

Radio anechoic chamber.

2. The main components of the anechoic chamber are the shielding chamber and wave-absorbing materials. The shielding room consists of shielding shell, shielding door, ventilation waveguide window and various power filters. According to user requirements, the shielding shell can be welded or assembled. The wave absorbing material consists of single-layer ferrite sheet and conical carbon sponge absorbing material. The working frequency range of single-layer ferrite sheet is 30 MHz to 1000 MHz, and the conical carbon sponge absorbing material is made of polyurethane foam in carbon gel solution, which has good flame retardant property.

3. screen door chamber with pneumatic door, using a double knife or single knife finger spring structure; screen door size in (1.5m2.1m) or so, the necessary wave-absorbing material on the door to clear; if the screen door requires regular maintenance, should provide a screen door maintenance kit.

4. Ventilation waveguide, the size and number of vents should be designed according to the need, and the ventilation of the dark room should be 5-8 times / hour.

5. Power filters use multiple AC and DC power line filters to filter the power supply of rotary stations, antenna towers, lighting, EUT and other equipment.

6. power line filters should pass UL safety certification, for frequencies higher than 10KHz, the insertion loss should be at least 100dB. insertion loss, leakage current and other index curves of each filter are given.

7. interface boards in addition to the entire darkroom and control room required interface boards, the location of other interface boards should be reserved in coordination with the equipment supplier. In principle, the number of interface boards should be as small as possible.

8. Grounding Provide a flat copper strip for the connection between the shielding layer and the grounding network. In principle, a single point of grounding should be used.

9. microwave absorbing material in addition to the floor, all other surfaces should be covered with ferrite material, including the interior of the door. In addition, some reflectors on the five surfaces of the Fennell area to be covered with composite absorbing material. In order to meet the radiation sensitivity of the test, you need to set aside ferrite and wedge absorbing material to meet all the test requirements of the radio wave darkroom. In principle, these materials need to be easy to move.

10. floor darkroom proposed to use elevated reflective floor, about 30 cm high. should be committed to the floor will not be deformed. From the dark door to the turntable should withstand 500kg/m2. the rest of the area should withstand 150kg/m2 without deformation. The elevated floor should have a good electrical connection with the dark room shielding wall. Secondly, the floor between the antenna and turntable should be level. 8. antenna tower according to IEC61000-4-3, the antenna tower should be able to meet the requirements of antenna lift within 1-4m; at the same time, there should be an adapter that can be used to install various types of antennas.

11. cd player diameter 2m, about 30cm high metal turntable; to ensure the level and electrical continuity between the turntable and the upper metal floor.

12. power terminal block should provide convenient power terminal block for EUT, antenna tower and turntable respectively.

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