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IWR6843AOP: PCB天线区域挖空问题

Part Number: IWR6843AOP

想请问一下6843AOP的天线区域挖空的问题,芯片所在的TOP层梯形区域挖空还是所有层的梯形区域都需要挖空?希望能尽快回复,谢谢。