wideband wilkinson power divider

Hello
i want to design wideband wilkinson power divider and used
A Class of Broadband Three-Port TEM-Mode Hybrids , SEYMOUR B. COHN, MICROWAVE THEORY AND TECHNIQUES, VOL. MTT-16, NO. 2, FEBRUARY 1968
to multistage power divider.
this paper show a table, but i want to use different number for example f2/f1=2.5 .
this paper consider R=2 for design z1 , z2 , ... by use Young's transformer tables.
my question is why consider R=2, can i consider 3?
please explain way of design .

thanks.

Not everyone including myself can read IEEE journals.

If R means Impedance Ratio, yes you can consider any ratio, but wide bandwidth has compromises.
http://www.gb.nrao.edu/electronics/edtn/edtn176.pdf