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Micro filter
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Micro filter
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功能簡介及推展:
CMF-2012-2G45-32,主要笔记电脑插USB dongle 時 RFI noise 干扰WiFi天线时使用。同进可以用于HDMI,STTA 3.0.
CMF,WCM是两阻线圈,CMF是一个filter,多一对焊点接地,尺寸相同,只要在pad加两个孔接地,CMF是一连串的LC filter 造成滤波效果。S参数曲线(用网路分析仪器量测),分S11及S21。
(如图一)Sdd21 指的是差模讯号,损失越少越好。定义:-3dB的时候能量损失一半,故讯号损失一半就不行了! 但此颗到9G材負1~2dB。
(如图二)Scc21 干扰RFI干扰对策的元件。在笔记本电脑市场里在wifi当红,天线在2.45G/5G受干扰严重,此颗会有很好的效果,现在各家的防制方案都是用铁壳封闭一整条路,未来可用这个料取代。
此类产品有2.45G与5GHZ频段产品。
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