Q21.py

from smith_chart import plot_smith
from pylab import *

plot_smith()


ZVmax = (3+0j)

G = (ZVmax-1)/(ZVmax+1)
plot(real(G),imag(G),'bo')

# marker of load impedance
text(real(G),imag(G),ZVmax)


text(0.9,0.9,r'$|\Gamma|=%0.2f$'%abs(G))
# G - circle
theta = linspace(0,2*pi,128)
plot(abs(G) * cos(theta),abs(G)*sin(theta),alpha=0.4)

#line along Maximum
amp = linspace(0,1.3,128)
plot(amp*cos(angle(G)),amp*sin(angle(G)))

L = 0.1 # lambda (6/30)  *  (lambda/2)
# travel towards load
phi = linspace(0,-L,64)*4*pi
for p in phi:
    plot(abs(G) * cos(-p+angle(G)),abs(G)*sin(-p+angle(G)),marker='o',c='m',markersize=6,alpha=0.2)


# Line to the Load
amp = linspace(0,1.3,128)
plot(amp*cos(angle(G)+4*pi*L),amp*sin(angle(G)+4*pi*L),c='m',alpha=0.6)



savefig('Q21.png',dpi=150,bbox_inches='tight')
show()