从VNA保存数据使用matlab绘制给出了2个不同的峰值

我认为你需要更改定义的数据保存格式，下面的链接会有所帮助，我不熟悉你的确切分析器。
如果我使用matlab并且需要将数据从线性切换到日志，我通常使用内置函数：mag2db和dB2mag。
http://na.tm.agilent.com/pna/help/latest/S5_Output/SaveRecall.htm#ASCII -Chris



     以下为原文

  I think you need to change the defined data save format, the link below will help, I'm not familiar with your exact analyzer. If I'm using matlab and need to switch data from linear to log, I typically use the built in functions: mag2db and dB2mag. 

http://na.tm.agilent.com/pna/help/latest/S5_Output/SaveRecall.htm#ASCII


-Chris

感谢您的答复。
我将数据保存在data.CSV文件（附加）中，它在DB中。
我使用dB2mag将数据转换为线性。
当我们以CSV格式保存数据时，它是否可以节省幅度和相位？



     以下为原文

  Thank you for the reply. I save data in data.CSV file(attached) and it is in DB. i use dB2mag to convert data to linear. when we save data in CSV format does it save magnitude and phase?

比你想象的要复杂一点。
显示的数据是b2,1，它是端口2的功率。您的绘图是lin mag，因此结果以瓦特为单位。
你认为你是在测量功率还是你认为你正在测量增益之比（可能是S21或b2 / a1或B / R）。
要将matlab转换为pna数据，您需要告诉我们matlab数据的单位是多少;
伏特，瓦特，毫瓦，dBm，dBmV？



     以下为原文

  slightly more complicated than you might expect.

The data shown is b2,1 which is the power at port 2.  you plot is in lin mag, so the results is in Watts.

Do you think you are measuring power or do you think you are measuring a ratio such as gain (which would be S21 or b2/a1 or B/R).

to convert the matlab to pna data, you need to tell us what the units of the matlab data is; volts, watts, milliwatts, dBm, dBmV?

感谢您的答复。
我正在测量b2 / a1（a1 = 1），频率（Hz），b2,1（DB），b2,1（DEG），是我在.CSV文件中的列，当我以logmag /格式保存数据时
度。
然后我在matlab中使用dB2mag函数将DB转换为LIN。
我认为matlab图的单位是伏特。



     以下为原文

  Thank you for the reply.

I am measuring b2/a1 (a1=1) , 

Freq(Hz),     b2,1(DB),      b2,1(DEG), are the columns I get in .CSV file , when I save data in the format logmag/deg. then I convert DB to LIN using dB2mag function in matlab. 

I think units of the matlab plot is volts.

您所进行的测量不是比率测量b2 / 1 =非比率并且显示为b2,1，逗号1表示测量b2且源打开端口1.如果您执行了b2 / a1,1则数据将是比率
数据。
对于非比率，数据代表dBm功率（我认为这是一个错误，csv文件说dB而不是dB​​m）。
从线性功率到dBm的转换是PdBm = 10 * log10（功率以瓦特为* 1000）或10 * log10（功率以毫瓦为单位）。
对于增益，例如S21，单位是电压比。
要将增益转换为功率增益（以dB为单位），必须采用Gain_dB = 10 * log10（S21 ^ 2）= 20 * log10（S21）。
我们根据参数是比率参数还是非比率（分母= 1）来决定是执行10 log还是20 log。



     以下为原文

  The measurement you were making is not-ratio measurement b2/1= not ratio and is displayed as b2,1 the comma 1 means measure b2 with source turned on port 1.
if you did b2/a1,1 then the data would be ratio data.

For non-ratio, the data represents dBm power (I think it is a bug that the csv file says dB instead of dBm).

The conversion from linear power to dBm is PdBm=10*log10(power in watts*1000) or 10*log10(power in milliwatts).

For gain, such as S21, the units is ratio of voltages.  To convert gain to power gain in dB you must take Gain_dB=10*log10(S21^2)=20*log10(S21).

We decide whether to do 10 log or 20 log based on whether the parameter is a ratio parameter or a non ratio (denominator = 1).

非常感谢您的解释。



     以下为原文

  Thank you very much for the explanation.