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  • Writer's picturextgaby

Guanella 1/9 current balun.

Updated: Apr 26, 2021

Picture:

Schematic:


Input: 3 transmission lines with an impedance of 150 ohms in parallel = 50 Ohms,

Output: 3 transmission lines with an impedance of 150 ohms in series = 450 Ohms.


Picture input Picture Output

Impedance of a transmission line:

Formula:

Impedance = 276 log (2D/d)

Wire diameter (d) = 0.9 mm

Distance (D)= 1.58 mm



To achieve 150 Ohms, you have to tune de distance between de two wires.

This will give you a good return loss result.


Measuring results:

- Return loss:



- Insertion loss:


Picture:

Insertion loss is for two devices!

Insertion loss is for two devices!

Return loss of this steup:




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3 Comments


坂本 涼
坂本 涼
Mar 24, 2023

What toroids did you use? And the mixture?

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坂本 涼
坂本 涼
Mar 30, 2023
Replying to

Thanks.

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