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TRF7962A寻卡

我是参考TI官网上给的代码写的寻卡操作,我手上有2张标签,UID分别为23 39 1E 2B 50 01 04 E0 和  53 39 1E 2B 50 01 04 E0,单张标签天线上时是可以分别被寻到的,但是2张同时放上去的时候,结果一张都 寻不到,是什么原因导致的?