Sample holder length = 1.9500e-003 meters
Sample thickness = 3.2000e-004 meters
Distance to sample = 0.0000e+000 meters
Sample holder Fco = 6.5600e+000 GHz
Test data:
frequency s11r s11i s21r s21i s12r s12i s22r s22i
8200000000 -0.7835 0.2117 0.1583 -0.1661 0.1594 -0.1657 -0.7953 -0.1117
8221000000 -0.7836 0.2142 0.1571 -0.1671 0.1581 -0.1668 -0.7958 -0.1119
8242000000 -0.7836 0.2166 0.1559 -0.1681 0.1569 -0.1678 -0.7962 -0.1121
8263000000 -0.7837 0.2188 0.1547 -0.169 0.1558 -0.1688 -0.7967 -0.1122
Also see http://link.springer.com/chapter/10.1007/978-3-642-03290-5_17
The magnitude |S11| of the scattering parameter S11 can be calculated from the sqrt( S11r^2 + S11i^2), where S11r and S11i are the real and imaginary parts of the scattering parameter S11, respectively. The same is for the transmission coefficient S21.
From the simulated result, I got S21 coefficient. The formula for Shielding Effect is SE (dB) = ─ 20 × log (Et/Ei) . Kindly tell me how to calculate SE from my simulated S21 values.
Please look up the definition of your simulated scattering parameters at https://en.wikipedia.org/wiki/Scattering_parameters . Everything is more or less explained there.
How can I calculate EMI shielding and also how can Calculate |S11| or |S21|?
I measured the S-parameters (S11 and S12) for the EMI shielding
here i uploaded my data file in which S parameters were obtained using VNA.
Here is a video, where I explain how to plot the s2p file in MATLAB.
https://youtu.be/WhNOO6BZi2g
If you want to obtain some shielding efficiency, you should (in the simplest case) measure the transmission coefficient s_21 with and without the shielding material or shielding enclosure. The ratio of the two linear values (or the difference in dB-scaled quantities) gives the the shielding efficiency.
Hi Masud Rana
Pls check the data attached.
For more details: https://github.com/ArunBhas/EMI-Shielding-Effectiveness-Calculator
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