Guanella 1/9 current balun.

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: