MATLAB Answers

How to convert logarithmic to linear

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Moza Mohamed
Moza Mohamed on 20 Sep 2021 at 6:28
Answered: Star Strider on 20 Sep 2021 at 11:06
I use rfplot to plot magnitude of s-parameters in db, if i want to plot the s.parameters in linear form how can i do this ?
s=sparameters("C:\Users\Moza Salem Mohamed\OneDrive\Desktop\MM\Lab 2\emptyCell.s2p")
figure
rfplot(s,1,1)
hold on
rfplot(s,2,1)
title("Empty Cavity (Log)")
hold off

Answers (2)

KSSV
KSSV on 20 Sep 2021 at 6:49
Take exp of the result. The inverse of log is exp,

Star Strider
Star Strider on 20 Sep 2021 at 11:06
If you have the Signal Processing Toolbox, use the db2mag function.
If you do not have it:
dB2mag = @(dB) 10.^(dB/20); % Note: Capital 'B'
mag = 100;
dB = mag2db(mag)
mag = dB2mag(dB)
Since MATLAB is case-sensitive, the ‘dB2mag’ anonymous function will not overshadow any of the db2mag functions in the Toolboxes. (The exp function will not work in this instance, since decibels are defined in terms of base-10 logarithms.)
.

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