# Microwave Splitter Design QUESTION - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

chukster
Post subject: microwave splitter design QUESTION Posted: Wed Apr 23, 2008 8:14 pm

Lieutenant

Joined: Wed Apr 23, 2008 7:44 pm
Posts: 2
Location: Folsom CA
I need a (quick and dirty) splitter design.

0.1 to 1.0 GHz
5W max input power,
connectorized with BNC.

I am thinking of going with a Wilkinson configuration.

Is there a quick and easy solution for this? Such as an online Wilkinson calculator?

I investigated using an SMT device and mounting it on a PCB, but they're not rated any higher than 2W.

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imodelit_moderator
Post subject: Posted: Thu Apr 24, 2008 2:36 am

Captain

Joined: Wed Jun 20, 2007 3:01 am
Posts: 22
Dear chukster,

For online Wilkinson calculator; http://www.imodelit.com/ViewDetails.aspx?AID=96

Best Regards,
imodelit Moderator

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chukster
Post subject: Posted: Thu Apr 24, 2008 8:14 pm

Lieutenant

Joined: Wed Apr 23, 2008 7:44 pm
Posts: 2
Location: Folsom CA
OK

now from there how do I translate those numbers into hard values?

such as: "L" is the inductor, I guess. And the unit of measure is "m" (meters?)

how do I get that in microHenrys?

Any responses are appreciated!

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imodelit_moderator
Post subject: Posted: Sat Apr 26, 2008 2:56 pm

Captain

Joined: Wed Jun 20, 2007 3:01 am
Posts: 22
Hi chukster,

Well, if you are satisfied with divider's behavior, you can convert from the electrical parameters into physical parameters, as Zo=sqrt(Eeff)/(Co*C), where Co is speed of light and C is the capacitance per unit length. Then calculate the line inductance as L=(Zo^2)*C (inductance per unit length). Finally, multiply the calculated inductance by the line length.

Best Regards,
imodelit Moderator

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mac
Post subject: splitter etc design toolPosted: Wed May 07, 2008 8:10 am

Captain

Joined: Fri Nov 02, 2007 3:45 am
Posts: 8
Location: germany
Hi
try the free rf tool
RFSim99
it has an integrated design tool
to calculate all kinds of splitter, divider etc. resistive and wilkinson -
anyway its a graet tool to do some simple
simulations in rf and its free -

but remember your splitter must handle that power when calculating
values especially when using resistive splitter instead of
wilkinson design !!

_________________
regards
mac

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