采用两块CC2640，使用板载天线。根据《CC2640软件开发指导书》，如下图所示，cc2640共有13档的功率可调。根据实测发现，即使将主机和从机的功率调整到_21_DBM，两个蓝牙也需要将近20m才会断开连接。而实际项目开发需求为5m左右。请问，有没有其他的方法，可以继续降低发射距离吗？
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