Design of a 50 ohms balun on CST

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KacyAma

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Hi everyone

I would like to design a 50 ohms balun on CST and also simulate it. I tried designing one but after simulation it says 'the distance between the element 1 and waveguide port is small. Must be at least three mesh steps'. Advice pls
 

First advice: Increase the mesh density
Second advice: Post a pic of your simulation structure. It's easier to help.
 

The highest meshcells is 300,000. Where do I increase the mesh density. The attached file is the design of the balun. I just have a feeling the design is wrong. Thank you
 

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  • design of the balun.jpg
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Can you post a better pic of your structure? You can change the mesh density in "Global mesh settings".
 

Is this clear enough?
 

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  • balun.jpg
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  • view.jpg
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Ok, increase the mesh density or try to become familar with adaptive meshing and local mesh setup. You can check your settings with the mesh view.
 

I will try it. Do you think I should fix another lumped element at the spiral antenna point that is create a point P1 and P2. Because the 50 ohms is feeding into an antenna with an impedance of 183 ohms.
 

Yes. But I read somewhere, it was suggested to use a tapered balun for the antenna. I do not know anything about balun or how it is designed. Coaxial balun looked liked the easy one to design.So confused.
 

@ johnjoe Had to change the design of the balun for a S-band spiral antenna. The issue now is getting the accurate calculation for the design. I am using a journal 'A printed circuit balun for use with spiral antennas' to get the dimension but can't figure it out. Help plssssssss
 

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