How to use y2abcd function if y parameter matrix has variables

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ABIRAMI
ABIRAMI 2024-12-4，5:15
回答： Walter Roberson 2024-12-4，8:48
I have to find the equivalent of three two port networks cascaded as below where x1 and x2 are variables ans the matrices represent y-parameters. I am trying to convert them to abcd matrix and then multiply to obtain equivalent abcd which can then be coverted to y.
This is the code I have written for the same
syms x1
y1 = [x1,-x1;-x1,x1];
syms x3
y3 = [x3,-x3;-x3,x3];
syms x1
t1 = y2abcd(y1);
syms x2
t3 = y2abcd(y3);
But, I am getting an error

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采纳的回答

Walter Roberson
Walter Roberson 2024-12-4，8:48
Ran in:
Nothing in the RF toolbox accepts symbolic parameters (unless it is by accident.)
You cannot use y2abcd() with symbolic parameters.
That said, the calculation is:
syms x1
y_params = [x1,-x1;-x1,x1];
abcd_params = [
-y_params(2,1).\y_params(2,2), -1./y_params(2,1);
y_params(1,2)-y_params(1,1)./y_params(2,1).*y_params(2,2), ...
-y_params(1,1)./y_params(2,1)];
disp(char(abcd_params))
[1, 1/x1; 0, 1]

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