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rat race coupler using hfss

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bhaskar25

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hi,i want 2 design rat race coupler by using em simulation(HFSS),and i designd it,but problem is i dnt get S11 parameter means i got S41(40 db)iam expecting that s11 closely equal to S41,but s11 i got some 10 dd,can any one knw the solution
 

Maybe a picture would be helpful!
 

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