Need help trying to plot power beam patterns in dB
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Hello,
I am getting extremely confused trying to plot a power beam pattern in Matlab with a dB scale for the y-axis.
Basically, I have a function, G = 10log10(norm((Y(x)/M)^2) that needs to be plotted. The x-axis should be in values of theta, between -90 and 90 degrees, and the y-axis should be in dB scale. The Y(x) function, with is contained in the G function, is then evaluated at certain values of theta (-75, 0, 30, and 60), and the results are then plotted.
As shown above, I have already converted the values of the G function to dBs, however, when I try to manually change the y-axis scale and tics to shown dB scale, my plot is gibberish.
Any advice or tips would be very much appreciated. Thanks in advanced.
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Star Strider
2018 年 1 月 21 日
‘when I try to manually change the y-axis scale and tics to shown dB scale, my plot is gibberish.’
Please post the relevant parts of your code.
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Star Strider
2018 年 1 月 21 日
My pleasure.
The reason your plot is not working out as you want it is that you are using semilogy to plot a signal you have already log-transformed into dB.
Just use plot, or perhaps polarplot.
Also, I noticed that ‘theta’ appears to be in degrees. Either convert it to radians by multiplying it by pi/180 or use the sind function instead of sin.
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