Minimizing Cost Function using gradient method on Coupling matrix. RF filter.

Hi,

I've been following approaches by Atia and Cameron to construct a Coupling matrix for a Chebyshev filter. I'm now trying to use Amari's approach to optimize the Coupling matrix by minimizing the Cost Function using his Gradient approach.

Can someone send me a paper or Matlab code that goes about step-by-step how to construct the Gradient of the Cost Function (the actual full equation) and how to use it's results to change the Coupling Matrix values and choose mij step sizes? Matlab code would be the best format.

I've been able to reproduce Coupling Matrix constructions from Atia's papers in Matlab and can share that code.