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From: Andres Romero on 5 May 2010 07:15
Hi, I had the same problem but I figured out a way to solve it:
Linear values below 0 are negative values in the logarithmic scale, so polar plot takes the absolute value instead.
If you want a logarithmic plot of a function x(theta) in a logarithmic scale that goes between -40 and 0 dB you should write

polar(theta,40-10*log10(x))

Your polar plot will then have values between 0 and 40. You can then manually change the value of 40 to 10dB (edit plot, double click in the 0 value)
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