Designing the layout of rat-race mixer

I am having trouble designing the layout of rat-race mixer(up-converter,IF= 2GHz). Has anyone worked on these kind of mixers.

Some helpful links:

http://www.eagleware.com/pdf/apps/20...kSubmittal.PDF
http://www.ctsystemes.com/zeland/pub...beitspaper.pdf
http://www.ece.uvic.ca/~whoefer/elec...cture%2018.pdf
http://e2vtechnologies.com/datasheet..._mixdetect.pdf