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multi section coupler impedances algorithm

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antenna_beginner

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Hello, i would like to create an 11 section coupler with 0.1 ripple,
i cant find an example of how exactly they got these numbers in the attached photo.

Thanks
Capture.JPG
 

I guess the answer is in the text book chapter before the table...

I don't know if the coupler has been designed applying a theoretically derived systematic approach or by empirically fitting the section length and impedance using an equiripple (chebyshev) error optimum.
 

i have read lots of articles and they dont go into specifics regarding how mathematckly they derived these numbers.
i know that its odd mode chebyshev polinomials.

but how exactly it could be done mathemticky its hard to say.

if you could share some example.

Thanks
 

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