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如何在连接天线时测量LNA的噪声系数?
我想将天线与LNA匹配以获得最佳噪声系数。 以上来自于谷歌翻译 以下为原文 How can I measure the noise figure of a LNA when the antenna is attached? I want to match the antenna to the LNA for best noise figure. |
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当天线增益开始发挥作用时,它很难甚至术语噪声系数有点模糊。
如果你只测量噪声功率,并调整最低噪声功率,这是一种方法,但你不知道调谐是否与天线不匹配,以至于信号增益下降超过噪声功率。 我熟悉一种称为G / T的测量方法,用于测量有源天线的有效增益/噪声。 我没有SA测量的方法,但是我写了一篇关于使用PNA-X测量这个的白皮书,我已经附上了。 以上来自于谷歌翻译 以下为原文 It's difficult and even the term noise figure gets a bit fuzzy as the antenna gain starts to play a role. If you just measure the noise power, and tune for lowest noise power, that is one way but then you don't know if the tuning has mismatched the antenna so much that the signal gain drops more than the noise power. I'm familiar with a measurement called G/T that measures the effective gain/noise of an active antenna. I don't have a method for SA measurement but I wrote a white paper on using a PNA-X to measure this, which I've attached. 附件
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