How to take a practical compensation in a microstrip hybrid?

How to take a practical compensation in a microstrip hybrid such as lange due to odd mode and even mode non-equ phase velocity?

The easiest way (not an exact solution) to place capacitors between adjacent inputs (two pairs). In the simplest way they are not there for the even mode and they compensate a little in odd mode.
g579

I have saw a 6-finger mutiple line design ,it use a little cap shunt with the isolation term resistor to compensate.another problem:when I use ADS2002 to design such a coupler,the EM simulate results sames have much difference with schematic results ,so I think the 6-finger lange passive model ADS2002 use maybe not so exact.but how to do a calibration?