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USB辐射超标怎么处理



现在做个PCB板,单片机带USB模块,单片机的USB线到USB端口约50mm长,然后连接个1米长的usb线到适配器供电。

现在发现emc辐射超标,推测是1米长的usb线产生的辐射,但在usb线上加磁环,仍然超标,

只有屏蔽掉USB模块辐射达标,请问该怎么处理?谢谢