CST Microwave Learning

Hi all, greetings to all,

I'm currently designing a 180 degree compact rat-race hybrid coupler for butler matrix network. I divided my rat-race into 8 sub-structures : 4 t-junctions, 2 bends and 2 straight lines. I've already obtained the results for each part of my sub-structure. But now i'm not sure how to combine the structures so that i can obtain the output for the whole rat-race hybrid coupler that is 180 degree phase difference. I'm aware of exporting the sub-structures to DXF file format but i am not sure which environment or how is the step to combine it and get the combined rat-race hybrid coupler output.

Appreciate very much if you can help. Thanks

Best & Warmest Regards,
SAM