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usb dongle通讯距离有多远，倒F天线和那个cc2540EM上面的那个天线效果差多少？cc2540EM上面的天线叫什么，上面没有滤波器，不需要吗？为什么
天线信息请参考http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=swra351&fileType=pdf
EM上的天线是pulse的，具体参数可见http://www.pulseelectronics.com/index.php?928
滤波器由客户自己选择是否使用。
天线信息里面 80%（EB）94%(SA) 是什么意思？我怎么根据这个去选？
EB is Evaluation board, SA is Stand Alone. For the DN007 EB means a CC254xEM mounted on a SmartRF05EB, while SA means the board in the antenna kit http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=swra328&fileType=pdf
天线周边的环境会影响天线性能，这是天线设计理论方面的知识。
