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TRF7962a ISO/IEC 15693标签远距离读写器读卡问题

Other Parts Discussed in Thread: TRF7962A

请问一下,我参照TI的TRF7962a 4W输出设计了一款ISO/IEC 15693标签远距离读写器,天线尺寸大小为50CM*40CM,天线输出功率已经达到36DB,但读卡距离只有35cm,怎么才能把距离调到60cm,接收RXIN信号很杂乱,是否是因为发射信号干扰了接收信号?