用两层板做了蓝牙防丢器，板厚0.4cm，做了阻抗控制， 采用Johanson的 Balun方案， 在强制发0dbm 无调制的空载波时，测量巴伦非平衡端输出只有-15dbm，这个有没有可能是因为巴伦（淘宝购买）是假货的原因？去掉巴伦测CC2541的RF差分输出端口上功率有-5dbm的样子（这个端口输出阻抗非50欧姆，所以测得的功率和实际有差异），请大家帮忙分析一下呢？
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