quadrifilar helix antenna feeding?

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winglj

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Hi, everyone. I have a question about the quadrifilar helix antenna feeding design. Actually, it requires 4 different output with 0, 90, 180, 270 degree phase difference. Most of the literatures requires a 180 balun with 2-90 degree quadrature hybrid.

I am wondering whether there are any commercial chip or coupler for this type of applications, or any other good design topology which requires simpler feeding structure?

Thanks in advances.
 

There are a numbeer of modes possible and useful for different siutuations. Look up reference material by Kilgus and see if you can run down a book by Corzine and Mosko on the subject. Both should be helpful. (....and no I do not have an e-book version)
 


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    winglj

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