RF screen coating saves space

【嵌牛导读】：

提起“ 创新”，似乎神秘而遥远。我认为，对于电子设计工程师来说，能把可用的技术、产品用到解决所面临的问题上，把问题更好地解决，这就是“创新”，是工程师价值的体现。
从金属罩子到sprayed-on conductive coating，也许在理论家的眼里简直算不是什么创新，但MicroShield公司这样做了，效果很好，还准备授权给其他厂商，这就是实际价值。
愿有理想的未来工程师们从“问题意识”开始，做实事，不要眼高手低，高不成、低不就。

【嵌牛鼻子】：
sprayed-on conductive coating

原文： http://www.edn.com/index.asp? layout=articlePrint&articleID=CA6553632

RF screen coating saves spaceBy Graham Prophet, Editor, EDN Europe -- 5/1/2008
EDN

MicroShield screening technology from RF Micro Devices integrates RF screening on the surface of a molded package. The protected device might contain a single chip or a multichip module. The company developed the process to replace metal screening cans that designers must often mount on PCBs (printed-circuit boards) either to shield the enclosed circuitry from external interfering signals or to prevent RF- interference leakage.

The sprayed-on conductive coating makes conductive contact with a “skirt” contact band that runs around the bottom edge of the molded package. When the assembly process solders the package to the PCB in the usual way, the skirt contacts a grounded ring that surrounds the package site. A ground-plane under the package, with vias for connections, completes the screen.

A company spokesman indicates that results are competitive with those of metal cans and that the technology reduces height and volume for RF-circuit sections by 25 to 50%. RF Micro will employ the process on its own product lines as an option, and it will also license it to other manufacturers.