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+//Chapter 3, Problem 3
+clc
+//https://atoms.scilab.org/toolboxes/microwave
+//Download and install the Microwave toolbox from above link and load it from scilab menubar > Toolboxes > microwave
+
+//Plot the smith chart 
+uW_display_smith([.2 .5 1 2 5],12);
+r=0.667                                         //radius of VSWR circle
+Z=0.25-%i*0.5;                               //impedance
+Z1=50*Z;                                    //50 = characteristic impedance
+G=(Z1-50)/(Z1+50);                          //reflection coefficient
+R2=0
+plot2d(real(R2),imag(R2),-1);
+plot2d(real(G),imag(G),-8);
+
+//Plot a VSWR circle of radius 0.667
+x=linspace(0,2*%pi,200);
+plot2d(r*cos(x),r*sin(x))
+xtitle("Smith Chart");
+
+
+printf("From smith chart, The answer is %.3f (magnitude) and -124 degree (angle)",r)
+disp("This is shown as point C in Figure 3.11.")