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我发现mmwcas-rf-evm每个接收天线阵列里有5根接收天线，多出来的一根是干嘛的，我在板子的user guide里没有找到这根天线的作用描述？
多出来的天线没有使用。板子上总共是16根RX，请参考下面的文档里的天线编号。Figure 5. Device and Antenna Array Groups https://www.ti.com/lit/ug/tiduen5a/tiduen5a.pdf
