really12138
Newbie
My topology is a pi network with only passive lumped elements and I want to use the Y parameters to calculate the admittance of the three parts of the pi network.
As can be seen from the figure, my imagY(2,1)=imagY(1,2)=(imag(Y21) + imag(Y12))/2 (because the three curves in the lower left corner overlap), imag(Y11) = imag(Y22) (similarly, the two curves in the lower right corner also overlap).
So the question is, why is (imag(Y21) + imag(Y12))/2 + imag(Y11) ≠ (imag(Y21) + imag(Y12))/2 + imag(Y22)? (As can be seen from the figure), their curves are not equal, and it is not a simple "negative" relationship. I tried other circuits (even including converting the S parameters obtained by testing passive components such as capacitors into Y parameters and then calculating them), and found that they are not equal? Why?
Ports 3/4 are connected to my passive pi network, and port 12 is connected to the test data I imported through the DAC (testing a passive capacitor)
As can be seen from the figure, my imagY(2,1)=imagY(1,2)=(imag(Y21) + imag(Y12))/2 (because the three curves in the lower left corner overlap), imag(Y11) = imag(Y22) (similarly, the two curves in the lower right corner also overlap).
So the question is, why is (imag(Y21) + imag(Y12))/2 + imag(Y11) ≠ (imag(Y21) + imag(Y12))/2 + imag(Y22)? (As can be seen from the figure), their curves are not equal, and it is not a simple "negative" relationship. I tried other circuits (even including converting the S parameters obtained by testing passive components such as capacitors into Y parameters and then calculating them), and found that they are not equal? Why?
Ports 3/4 are connected to my passive pi network, and port 12 is connected to the test data I imported through the DAC (testing a passive capacitor)