double stub matching using smith chart matlab code

A 75 ohm air filled coaxial line is terminated with a complex load of 109.5-j120 ohms. Design a double stub matching system using short coaxial lines of characteristics impedance 75 ohm.

Answer 1

[Muhammad]

%% *DOUBLE STUB MATCHING ON TRANSMISSION LINE*

g = real(YL_t);

b = imag(YL_t);

ld = 0:lambda/100:lambda/2;

b2 = (cos(beta*ld)/sin(beta*ld)) + (1/(g^1/2)*sin(beta*ld)) - 1;

b1 = (b2.*b2.*sin(beta*ld).*cos(beta*ld) - b2.*((cos(beta*ld).*cos(beta*ld))-((sin(beta*ld)).*(sin(beta*ld)))) - (b./g))/1 - 2.*b2.*sin(beta*l).*cos(beta*l)+(b2.*sin(beta*ld).*b2.*sin(beta*ld));

%Part1:legth of stub2

if (b1<=0)

lb = (atan(-1./b1))/2*pi

else

lb = (pi*atan(-1./b1))/2*pi

end

%Part2:length of stub1

if (b2<=0)

la = (atan(-1./b2))/2*pi

else

la = (pi+atan(-1./b2))/2*pi

end