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怎样为EFR32MG实现天线分集？
问题
怎样为EFR32MG实现天线分集？
答案
芯科并没有提供具有天线分集的EFR32MG参考设计。但是，你可以以EM35x的天线分集设计作为例子，比如如何选用外部的RF开关。自EmberZNet 5.7.4 版本协议栈起，对发射/软件分集（当MAC—Level的ACK没有收到时切换天线路径）就开始有了支持，并且通过天线插件（Antenna plug-in）的选择/配置任何的GPIO都可用来做天线选择功能。接收/硬件分集（对到来的数据包的RSSI值做评估从而选择最强的路径）功能是不支持的。也就是说，在设计中通过MODEM_ANT0和MODEM_ANT1 两个GPIO选择 (在有两个天线选择GPIO和一个外部RF开关情况下)来保证发射/软件分集暂时可用，如果将来加入了接收/硬件天线分集功能，可以通过软件升级来支持该功能。请参考EFR32MG1规格书的表6.5来了解哪些GPIO具有MODEM_ANT0 和 MODEM_ANT1功能的详细内容。
就硬件的建议上，天线应该分开至少1/4波长的距离，而且应相互转成90度。请参考上述的EM35x天线分集设计作为例子。
英文原文：
https://www.silabs.com/community/wireless/zigbee-and-thread/knowledge-base.entry.html/2016/11/09/how_can_i_implement-hsvn