Guanella 1/9 current balun.xtgabyApr 24, 20211 min readUpdated: Apr 26, 2021Picture: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 OutputImpedance of a transmission line:Formula:Impedance = 276 log (2D/d)Wire diameter (d) = 0.9 mmDistance (D)= 1.58 mmTo 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:
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 OutputImpedance of a transmission line:Formula:Impedance = 276 log (2D/d)Wire diameter (d) = 0.9 mmDistance (D)= 1.58 mmTo 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:
1:49 balun with FT400-43 material and the influence of the winding method on the measurement results.
What toroids did you use? And the mixture?