need help::Design of fractal rat race coupler

sir,
while reading a paper published in IEEE in 2004--
Design of fractal rat race coupler
By HANI GHALI AND TAREK MOSELHY
Electronics and Communication dept., Ains Shams University, cairo, EGYPT

i am not getting which software they have used IE3D or Ansoft Design and how different ports are allocated.so please help me.

Regards