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Balun Electrical Model - RF Cafe Forums

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

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

Post subject: balun electrical model Posted: Wed Sep 12, 2007 8:31 am


Joined: Wed Sep 12, 2007 8:04 am
Posts: 2
I'm searching for an electrical model for a balun (type anaren BD2425J50100A00, a 1 to 1 RF transformer working at 2.45GHz)
- not a S3P parameters but a model with mutual inductance, capacitors and resistors - like a P-spice model and how can i proceed to find components value ?

Thank you for your help.


Post subject: Posted: Wed Sep 12, 2007 2:50 pm

Site Admin

Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
I don't think that what you are looking for is available, as this is a passive RF device. The only interesting information of a Balun to my humble opinion are the S-parameters which you only need to model this device in terms of return losses and insertion losses.

As this is a passive and not active device there are no junction capacitances or inductances which are used in Spice model.

What would you like to know: The capacitance and inductance of the transmission lines of which the Balun is made of?


Post subject: Posted: Thu Sep 13, 2007 3:23 am


Joined: Wed Sep 12, 2007 8:04 am
Posts: 2
I already have the S-parameters of the balun but i would like to simulate (in term of current and power) the output of my silicium with the output matching network (on my board).

OK it's a passive device and so the model of a balun should be equivalent to a network composed by 2 coupled inductors, 1 resistor , 1 capacitor(or more) ... that's what i would like to find.



Post subject: Posted: Fri Sep 14, 2007 2:57 am


Joined: Sun May 14, 2006 8:53 pm
Posts: 17
Location: Earth
If you have s-parameters, you could apply these to your model. And fit the values to match the response.

Mutually coupled inductors, with series resistance (for line loss) and coupling capacitor (for line coupling) would be a start.


Post subject: Posted: Tue Sep 25, 2007 3:08 am


Joined: Tue Mar 15, 2005 11:43 pm
Posts: 65
Location: Singapore

To add the comments above, I believe that Microwave simulator ,e.g. Microwave office has the ideal model of the Balun, which you can modify the parameters to match the available s-parameters.
And if I am not wrong, this model will enable you to simulate nonlinear analysis (current and power).



Post subject: balun practical examplePosted: Sat Nov 24, 2007 3:37 am


Joined: Fri Nov 23, 2007 11:59 am
Posts: 4
Location: Israel
I would like to use this thread and ask where I can find a good practical design example of a balun for L band.

Posted  11/12/2012

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