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# two-stage Wilkinson Power Combiner - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.

guest
Post subject: two-stage Wilkinson Power Combiner Posted: Thu Apr 14, 2005 11:34 am
I'm trying to build a power combiner at 75 Ohms and at the frequency range of 950-2025 MHz. I thought I would use a simple Wilkinson power combiner but since my bandwidth is so large I don't think that will perform well. I did some investgating and found out that by adding a second set of quarter-wave sections to the Wilkinson power combiner that you increase the bandwidth. However, I do not know the equations to calculate the impedances of all the quarter-wave lines or the two resistors. Can anyone give me those equations or point me to a sight or book that has them?

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Guest
Post subject: Posted: Thu Apr 14, 2005 3:57 pm
Hello,

The general equation for quarter wavelength transformer is the geometric average of the 2 impedances that you want to match: sqrt (Z1*Z2).
You can choose the impedances you want to and then calculate the transformer's impedance.

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Guest
Post subject: Posted: Fri Apr 15, 2005 9:21 am
Quarter wave transformer will only give 20% at best although there are designs for wide band transformers but it will be rather large. You can design a wideband wilkinson power divider. As far as the equations, I think that it may be on the RFcafe site, not sure of the link, bu tmaybe Kirt knows. Also, try google. I have a paper ( somewhere) , If I find it I will post the equations. Kirt is there a way to post a paper in PDF format on the site?

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Guest
Post subject: Posted: Fri Apr 15, 2005 9:32 am
There is a paper on it. Seymour B. Cohn, " A Class of Broadband Three-Port TEM Mode Hybrids", IEEE Transactions, MTT-16 NO 2 , Feb 1968. If I knew how to post the paper I would.

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Guest
Post subject: Posted: Sun Apr 17, 2005 9:34 am
Anonymous wrote:
There is a paper on it. Seymour B. Cohn, " A Class of Broadband Three-Port TEM Mode Hybrids", IEEE Transactions, MTT-16 NO 2 , Feb 1968. If I knew how to post the paper I would.

Hi!
I am another person who read your reply. I am interested in the subject of Wilkinson power diwider. Can you e-mail me the paper. My e-mail address is: m_samii@noavar.com.

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Guest
Post subject: Posted: Tue Jul 19, 2005 4:38 am
Guest wrote:
Anonymous wrote:
There is a paper on it. Seymour B. Cohn, " A Class of Broadband Three-Port TEM Mode Hybrids", IEEE Transactions, MTT-16 NO 2 , Feb 1968. If I knew how to post the paper I would.

Hi!
I am another person who read your reply. I am interested in the subject of Wilkinson power diwider. Can you e-mail me the paper. My e-mail address is: m_samii@noavar.com.

Hi
I am another person who intersted to have this paper too,can any of u send that to me
my email is prober_a@yahoo.com

Posted  11/12/2012
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