手机EMI屏蔽材料应用设计讲义

1、常用屏蔽材料1:导电布( Fabric Over Foam: FOF)常用屏蔽材料2(导电泡棉衬垫(CF)制成的板料,方形条,及用于电脑接口的I/O屏蔽衬垫常用屏蔽材料3:金属簧片 (Finger Stock)常用屏蔽材料4:导电橡胶 Conductive ElastomersHigh shielding effectivenessProvides environmental sealingExtruded, molded, and die-cutVariety of compounds and fillersBest for miniature devices.常用屏蔽材料4:导电橡胶 Co

2、nductive ElastomersHollow P25-50%Hollow D 20-50%Hollow O 0-50%Solid D 5-20%Solid O20-25%Flat strip 5-10%常用屏蔽材料5: 点胶 Form-In-Place ElastomerApplied to die-cast metal or metalized plastic parts.Can be applied to non-planar surfaces.Can be applied with standard application machinery常用屏蔽材料6: 5Connection

3、ElectrolyteAnode( + )Cathode( - )EMF1.10 VoltsZincCorrosionSilver受正压力受单剪切力受单剪切力/倒沟受90压力双向受的剪切力.120.200120 - 100 - 80 - 60 - 40 - 20 - 0 -dB | | | | | | | 10k 100k 1M 10M 100M 1G 10G Frequency (Hz)BeCu Metal GasketsBeCu Mesh GasketsBeCuFabric Over Foam GasketsElastomer GasketsMonel Mesh Gaskets卡扣短缝沟槽

4、双卡压敏胶/导电胶铆,焊,螺SNAP-INWELDRIVETRITE TRAKSNAP-IN RIVET TRAKCLIP-ONOTHERSSOLDERSLOT MOUNT PSA-金属簧片 安装 ParameterdB Falloff, 10k-10G VariabilityCompression Range Closure Pressure Usable in Shear Compression Set Flame Retardant Fluid Seal Surface Area Weight Gas PermeableBeCu FingerNo0 - 6 dB20 - 80%,45 2

5、0 #/Lin Ft0,3 kg/cmYesNoneYesNoMinimumLightNoBeCu MeshYes (Hi Freq)6 - 18 dB15 - 75%,4510 #/Lin Ft0,15 kg/cmNoNoneYesNoMediumLightNoMonel MeshYes (Hi Freq)6 - 18 dB5 - 15%,1020 #/sq in1.41 kg/sq cmNoMediumYesNoMaximumMediumNoFabric o FoamYes (VHiFreq)0 - 10 dB20 - 60%,4510 #/Lin Ft0,15 kg/cmLimitedLowYesNoMediumLightYesAg Filled ElastYes (LowFreq)40 - 60 d