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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?
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