Problems with a Rat Race (0.75GHz) on CST

[angus90]

I have some problems with the design of a Rat Race Coupler working at 0.75 GHz. i implemented it on CST but it does't work correctly.
data, figure and results are below.

Thank you for everuthing. i can also send the file.

 

[volker_muehlhaus]

As you can see, there is something wrong at port 2, so that you get total reflection. Check your model for open circuit or short circuit at port 2.

 

[angus90]

As you can see, there is something wrong at port 2, so that you get total reflection. Check your model for open circuit or short circuit at port 2.

How could i check my model for open circuit or short circuit at port 2? what should i do? I'm sorry but I'm a beginner.

 

[chameleon]

Make sure your ground plane is not touching your top traces.
I'll give it a look if you upload your model.