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Designing an RF shielded enclosure Anticipated problems must be factored into enclosure design

机译:设计射频屏蔽外壳外壳设计中必须考虑到预期的问题

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Shielding has been with us a long long time. Early AM radios had shielded RF and IF transformers, shielded electron tubes, and compartmentalized shielded chassis. These shields were necessary to prevent RF pickup, feedback, and oscillation by the electron tubes, radiation from the local oscillator, RF contamination of the IF strip, and crosstalk within circuit wiring. By the mid-1940s, there were a number of military RFI specifications to be met, and RF gaskets were in use (beryllium copper, silver elastomers, and monel wire mesh). In 1956 a tri-service shielded enclosure measurement specification was released called MIL-STD-285. Fifty years later it is still being used to evaluate shielded enclosures. This standard has been used to measure almost every kind of shielded enclosure, but it was originally designed to measure the enclosure attenuation provided for sources located outside the enclosure. How the enclosure is measured is significant. The measurement technique should reflect the proposed use of the enclosure.
机译:屏蔽已经存在了很长时间。早期的AM收音机具有屏蔽的RF和IF变压器,屏蔽的电子管和分隔的屏蔽底盘。这些屏蔽层对于防止RF拾取,反馈和电子管的振荡,本地振荡器的辐射,IF条带的RF污染以及电路布线内的串扰是必不可少的。到1940年代中期,已经满足了许多军用RFI规范,并且使用了RF垫圈(铍铜,银弹性体和蒙乃尔金属丝网)。 1956年,发布了一种三重服务的屏蔽外壳测量规范,称为MIL-STD-285。五十年后,它仍被用于评估屏蔽外壳。该标准已用于测量几乎所有类型的屏蔽外壳,但其最初旨在测量为位于外壳外部的信号源提供的外壳衰减。如何测量外壳非常重要。测量技术应反映外壳的建议用途。

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