Analyzing Guanella Impedance Transformers

#210 In this video I want to look at the Guanella transformer and some of its proprieties. Although its commonly used as a Balun, it can also be use as general purpose impedance transformer with various types of input and output combinations. Finally I will be trying to build such a structure and testing it out.
Balun series:
Ep1 - Communication lines and baluns • Communication lines an...
Ep2 - Voltage and Current baluns • Voltage and Current Ba...
Ep3 - Energy coupling • Energy transfer in Baluns
Ep4 - Transmission line baluns • Transmission-Line Baluns
Ep5 - Transmission line experiments: • Experiments with Trans...
Ep6 - The Ruthroff Transformer: • The Ruthroff Impedance...
Ep7 - The Guanella Transformers: • Analyzing Guanella Imp...
EP8 - LC baluns: • Building INDUCTOR-CAPA...
Further reading:
k5tra.net/TechFiles/Transform...
citeseerx.ist.psu.edu/documen...
www.researchgate.net/publicat...
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[@andrewmcfarland57]

A very balanced presentation that did not impede, but rather transformed my understanding of the subject. 🙂

[@ghlscitel6714]

Congrats! Yet another very good video. Applause!

[@minazulkhan8287]

Thanks fesz, u are the one who deepen my interest in ltspice.

[@hisheighnessthesupremebeing]

Hi Fez.. i hope you had a good Christmas and wish you a good New Year... Im always happy to se a new video from you.. but on the other hand then I knowI still have a backlog og your Videos i still haven't had time to sit down and enjoy/digest...

[@dalesmith8666]

Do a search for the "Kellermann Balun". It might be of interest to you and others, possibly try to simulate it and figure out how it works, the theory behind it. I contacted a few people on the subject, not much was given out. I'm a retired RF engineer, and also a Radio Amateur for 50 years. If I get the time I will also build one to test. Mind you that it is a 1:1 Balun. From what I can understand, it will handle plenty of power, depending on the size of the coax used, eg: rg142 or rg393. Should be a perfect Balun for a Balanced Tuner, on the input side of course, 50 ohms unbalanced in , output balanced.

[@aleksandartomic5515]

Hope you making money from all this videos, very useful they are

[@vincei4252]

Happy New Year, FesZ.

[@FesZElectronics]

Happy New Year!

[@bob_mosavo]

Thanks, FesZ 👍

[@luminousfractal420]

where to find one 😅 had one blown to bits on a pcb. tiny thing

[@raviselvans1963]

Happy New year 🎉💐💥

[@woodrowbeckford7610]

An interesting question is: at what frequency does the transformer cross over from transmission line mode to a more conventional mode where the line impedance is not a determining factor of performance.

[@FesZElectronics]

I remember reading somewhere that this point is around when the line length is 1/10 to 1/12th of the signal wavelength. So when its shorter than this, it will work in the "conventional" mode and above you start seeing the transmission line mode

[@user-um9er4lv6f]

Nice video and very informative. But have you tried an LTspice simulation of 1:4 transformer with transmission lines, to see the low frequency dropoff ? It must be depending on lengths of the lines...

[@FesZElectronics]

In the previous episode of this series - the one on Ruthroff transformers, I do show a method to simulate impedance transformers using transmission lines in which you can also see the low frequency drop off.

[@lambda7652]

What would be the disadvantage of using the same magnetic core for all lines on the Guanella transformer?

[@bob_mosavo]

You would have the two (or more) magnetic fields interacting with each other if all lines are using a single magnetic core. This would not produce the same results as using different magnetic cores. The multiple magnetic cores keep respective multiple magnetic fields separated from each other.

[@troy6882]

😃😄😁😆😅 5 Smile's.

[@johnnytang7385]

Hi FesZ, wondering if you can analyze the DC Blocker circuit. I tried simulate the circuit with LTspice but I got rather strange result.

[@FesZElectronics]

I think this is the first time of hear of this circuit; maybe you can give me some details on what you would like to use it for and when it is needed; also what sort of simulation issue did you run into?

[@chrisscott1547]

Thanks for discussing this. You are forgiven for your pronunciation of balun since English is not your first language. (Balanced to unbalanced) Baal-un. Not Bail-un. Not bay-lun.