How can I calculate EMI shielding using S Parameters

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Mathias Magdowski

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.

Brijesh Gaud

I read papers on EMI measurement. They provided that: The total EMI shielding effectiveness (SET) depends on the logarithm of the ratio of the incident wave PI to the transmitted wave PT obtained by the equation SET = 10log(PI/PT) dB. The reflection coefficient (R) and transmission coefficient (T) is calculated from the relations R = |S11|2 and T = |S21|2 with the waveguide method, respectively. The value of S11 and S21 can be directly obtained from the vector network analyzer. Meanwhile, the absorption coefficient (A) is obtained from the relation of A = 1−R−T. In addition, SET is the total value from reflection effectiveness (SER) and absorption effectiveness (SEA) given by SET = SER + SEA, SER = − 10log(1−R) dB, and SEA = − 10log(T/(1−R)) dB, respectively. I don't understand how to calculate (R) and (T). I know that R and T should be in the range of 0 - 1. and |S11|, |S21| were extracted from VNA in dB. What is the correlation between R, T, and |S11| and |S21|

Husna Jan

Raghunath Sahoo we don't have calibration kit for the waveguides...so we need to calculate SE separately for the waveguides without sample and then subtract the corresponding data from the SE data of the samples...that is the answer...any corrections?

Raghunath Sahoo

Husna Jan Basically calibrating is the subtraction of wave guide part. It is the transfer matrix method that determines the contribution of reflection and transmission.. but, more or less you can assume the same.

Arun Bhaskaran

You can download the following python code to calculate the EMI Shielding using s-parameters.

https://github.com/ArunBhas/EMI-Shielding-Effectiveness-Calculator

More details are attached as a manual in the above link.