When i adjusted the kx for fundamental mode (0.25 to 0.45), the index i am getting is 2.08807 where as in the eigen solver of the source is 2.81, even if i adjust the values to a smaller range.. how do i get the effective index of first order mode ( the second TE mode from the user selct option in the source)? When i adjust the range of kx in the sweep , i am getting the value of substrate effective index? should i use the same kx value or should i adjust the kx value in this case?
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