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How to plot a graph on frequency domain when i don't have any time parameter?

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shahriar sowad
shahriar sowad on 28 May 2021
Commented: shahriar sowad on 29 May 2021
I have plotted a graph in comsoll Frequency vs S11 plot,i need to transform it in frequency domain spectrum.How to do it?
  4 Comments
shahriar sowad
shahriar sowad on 29 May 2021
I was told to use FFT to plot in the frequency domain,i have no idea hopow to do it when i have no time values in the x axis

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Answers (1)

Girijashankar Sahoo
Girijashankar Sahoo on 28 May 2021
You are calculating return loss parameter with frequency.
Calculate PSD input and PSD of return signal
X(K)=(1/N)*fft(x(n)); PSDX=Pi=abs(X(K)*X(K)')
Y(K)=(1/N)*fft(y(n));PSDY=Pr=abs(Y(K)*Y(K)')
S11= 10log(Pi/Pr)
plot(f,S11)
  1 Comment
shahriar sowad
shahriar sowad on 28 May 2021
i Have frequency values in the x axis and S11 values in the y axis,i now want to plot the frequency domain from these values,how do i do it?

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