Need help:how to define ports of rat race coupler?

WITH reference to "Design of fractal rat race coupler" by Hani ghali in IEEE 2004 attached to this post.
I am not getting how they have defined transformer coupled port.kindly help me.

regards
ashish

hi
the following links will be help you, I hope that

http://www.microwaves101.com/encyclo...e_couplers.cfm

http://www.e-meca.com/tech_papers/hybrid_basic.php

AND YOU CAN SEE

R. Mongia, I. Bahl, and P. Bhartia, RF and Microwave Coupled-line Circuits, Artech House

GOOD LUCK

nafah many thanks for your reply and those links provided are helpful but still how they have connected ports to space filling curves (moore's 2nd iteration) is unclear.
I have simulated it taking width of transformer coupled port 1.62 mm on Ansoft Designer but i am not getting same results as shown in paper.Please help me on this.

I am attaching one more paper of their for your reference in which they have taken different space filling curve for rat race coupler only.


Regards
Ashish