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

[ashish_bit]

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

 

[nafah]

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

**broken link removed**

**broken link removed**

AND YOU CAN SEE

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

GOOD LUCK

 

[ashish_bit]

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