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The design requirement and precaution for rf shielding
View: Time: 2017-12-1 17:58:14
RF shielding is mainly used in mobile phones, GPS and other fields, it is to prevent electromagnetic interference (EMI), the components of PCB and LCM shielding.Below I'd like to share with you the design requirement and precaution for rf shielding.
Design requirement:
1.Shielding frame flatness should be 0.13mm, with enough strength,the thickness is 0.2mm, the height is 2mm,the distance from PCB edge is 0.75mm,the internal edge distance from the external frame should be 0.8mm(min).
2.Shielding cover thickness is 0.2mm, sometimes to make the componenets of heat and cooling, a small round hole added on the cover is acceptable, with diameter of Φ1.0 to 1.5 mm, if hole is too bigger,will lead to bad shielding effect.
3.Shield can shield LCM, the distance from the edge of shielding can and LCD visual edge should not exceed 1mm.
Design notes:
1.The blister tray that place the RF shielding too big, space of the blister tray, when SMT it's easy to swing, it can not be absorb, the rf shielding must be placed in the tray, left approximately 1.0mm activity space, if activity space is too big, will cause the shielding to swing, if activity space is too small,it will be difficult to pick out the shielding.
2.The picking point size of shielding cover should be appropriate,feeding point should be in the middle of the material as far as possible, the size of the discharge point is best Φ 6.0 mm, the bigger of feeding point, the higher stability of SMT,the efficiency will be higher.
Tina Lin