3x3 scattering matrix

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fingroo

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Hi, I am working on waveguide filters synthesis, which contain T junction. I use mode matching method to analyze the structure then I find 3x3 scattering matrix, but I don’t know how to make the cascade of two T junctions.
Can I convert the 3x3 scattering matrix to ABCD matrix? If yes who to find the final ABCD matrix
 

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