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关于13.56M高频读写器远距离读卡

Other Parts Discussed in Thread: TRF7962A

最近在做13.56M的读卡器。按照要求设计一个能读到50cm左右的读卡器。根据ISO15693协议,应该是可以达到的。可是我这次选用的芯片是TRF7962A.按照pdf搭建电路,可是也只有5-7cm的距离。我现在想不明白的是如何做才能达到那么远的距离呢?