搜索 - 科创

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小白求助，在用VNA测量4个已知频段为868MHz天线，发现每个天线都不准确。每次测量前都已经校准过了，有哪些可能的问题？如图这里有4个已知为868MHz的天线。其中一个是pcb天线。

868MHz是欧洲的ISM频段，915MHz是美国的ISM频段，这两个频段的引入避免了2.4GHz附近各种无线通信设备的相互干扰。868MHz的传输速率为20kb/s，916MHz是40kb/s。

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