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cc3220sf选用pcb倒f天线，pcb采用6层板，在天线布局时，天线底下是否需要铺地层？需要所有层都为空吗？
天线引出经过挠性带，即50欧姆走线中穿插过孔，信号影响大吗？
pcb倒f天线的一般传输距离多少？
