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two-stage Wilkinson Power Combiner - RF Cafe Forums
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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
thanks in advanse
my email is prober_a@yahoo.com
Posted 11/12/2012
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