Lnn Calibration on free space measurement setup

[Kursat Yildiz]

Hi,

In the context of my masterthesis I have to do some measurements on a free space measurement setup using two horn antennas and two lens. As VNA I'm using HP 8722ES. Besides one and two port calibration, the VNA has TRL calibration. My Prof. wants to try out LNN calibration. I don't know how can i setup the VNA for LNN calibration. I know both calibration techniques have 3 steps (T-R-L, L-N-N) , still have no idea how to adjust the TRL calibration on VNA to LNN calibration.
If it is not possible, has anyone an idea how to do it in MATLAB? I already wrote the following code.

b1=trace(M1*M0^-1);
b2=trace(M1*M2^-1);
b3=trace(M1*M3^-1);

c=((2-b3)/(2*(2-b2)))-1;
% with c=cosh(2*"Propogation constant"*l) 


q21_1=sqrt((b2-2)/(c-2));
q21_2=-sqrt((b2-2)/(c-2));

q12_1=q21_1;
q12_2=q21_2;

q11_1=(b1/2)+sqrt((b1/2)^2+(q21_1)^2-1);
q11_2=(b1/2)-sqrt((b1/2)^2+(q21_1)^2-1);
q11_3=(b1/2)+sqrt((b1/2)^2+(q21_2)^2-1);
q11_4=(b1/2)-sqrt((b1/2)^2+(q21_1)^2-1);

Any help would be appreciatet. Thanks in advance.

Kürsat