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how simulate a branch line couple in HFSS correctly

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xx_kitaro

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Dear all

I'm try to simulate a branch line couple in frequency band between 10.5-11.3 GHZ on substrate Rogers (h=0.508mm). the problem I have is that after optimization I can not get the -3dB amplitude in both port 3 and 2. the results are indicated in attachment. can anyone help me to find the solution? any support from you will be appreciated.
by the way I used the lumped port to excite the ports.

BR
 

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    sparameters.png
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