hybrid 90 design help

have any body idea for design broadband (8-18GHz) 3dB 90 deg hybrid?
what topology should be use?

Talk to Krytar. They have commercial units available.

Use Non-uniform, asymetrical coupled lines.

Rod

what is non-uniform? is it multi-section?
have uoy a reference for it? (book, paper,....)

A good book on the subject is: RF and Microwave Coupled Line Circuits,
by Rajesh Mongia.

This paper may be of interest to you.

http://palgong.kyungpook.ac.kr/~ysyoon/Pdf/tu2e_7.pdf

Yendori

u can find the theory in EDA upload and download ebook