9.1 Introduction to Polar Plot
The presence of magnitude plot and phase plot for showing the variation of gain and phase angle of a system with respect to the change in frequency is the major disadvantage of the Bode plot. The plot that combines both the plots to a single plot without losing any information is called polar plot. The polar plot can be plotted either on a polar graph or on an ordinary graph. Hence, polar plot for a particular system can be defined in two ways based on the graph used for plotting. The two different definitions for polar plot are given below:
The polar plot of a loop transfer function is defined as a plot of versus on the polar coordinates as the frequency varies from zero to infinity ...
