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Question Regarding Power Divider Design Article

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kumar16

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I have a question regarding this article i found on the forums on wilkinson power divider design. How do you get the Y values? You need them to get all the G values (which give you the isolation resistor values). I looked into Dr.Seymour Chon's paper in the reference and was stuck with the same problem, i.e. cant even find the Y values. Can someone please help me decode this? Thank you very much. I have attached the article link (as its already been posted) and some of its references as attachements. Thank you.

Article name: A general design formula of multi-section power divider
 

You have to be familiar with the 1960's way of talking to understand some of these papers. In general,

* Because they did not have computers back in the day, it was very helpful to generate tables of values that were "normalized" to some common impedance, such as 1 ohm. Now, nobody uses 1 ohm tranmission lines, but it is easy to convert a table of resistances from a 1 ohm normalized impedance to a 50 ohm normalized impedance by just multiplying by 50. (Of course, if the table were instead one of admitances, one would normalize it to 50 ohms by DIVIDING by 50).

* Table I on page 113 gives the (normalized to 1 ohm system) characteristic impedances of the quarter wave transmission line sections (Z1, Z2,...Zn), and normalized isolation resistor values (R1, R2,....Rn). These are the same values you would use in Fig 3 d, for instance, except you have to convert (Y1 =1/Z1, G1=1/R1, etc). So in other words, that Table I is the solution this guy had to finding the Y and G values for various boundary conditions.

* Note that unlike a many other designs, there is no one unique solution. Depending on bandwidth, number of elements, and how much gain ripple you are willing to tolerate, there are an infinite number of solutions to the problem--the table only shows a few specific examples
 

    kumar16

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biff44.
Thanks for your reply. But i still dont think i am getting it. I do agree there are infinite solutions, but lets say i am desging something for a bandwidth much more than that specified in the table or something that is in b/w to that was given, what do i do then? do i just extrapolate data and play around with numbers till i get the optimum value? or all these formulae unusable. Also you are referring to the orginal article by Dr.Seymour Chon, i was asking about the recent article (from IMS 2001) where i have the same problem, please advise. Its just that it is hard for me to accept that i will have to play around with software to give me something, but have no place to start even.
 

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