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
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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。
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。