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Need help with couple line coupler

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scuba

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couple line coupler

my question :
design a couple line coupler and it's coupling factor is 3 db.
and when i used the foumula @page 388 ,microwave engineer by pozar ,then i accroding the solution to simulate in @DS and i can't find the right condition.
can anybody give me some advice or reference to study?thanks.


and my substrate is

------------------------------
cond1 (cond=5.8e7 )
bcb (er=2.7)
cond2 (cond=4.1e7 )
Al2O3 (er=9.9)
------------------------------
 

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