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Balun, Marchand Balanced to Unbalanced Transformer: BALUN3


Equivalent Circuit


Name Description Unit Type Default
ID Element ID Text BU#
Z_in Char. imped of Txline into balun Resistance 65 ohm
Z_o Char. imped of open Txline Resistance 75 ohm
Z_s Char. imped of shorted Txline Resistance 100 ohm
EL_in Electrical length of Txline into balun at Fo Angle 90 Deg
EL_o Electrical length of open Txline at Fo Angle 90 Deg
EL_s Electrical length of shorted Txline at Fo Angle 90 Deg
Fo Frequency of electrical lengths Frequency 1 GHz

Implementation Details

This component models an ideal Marchand balun. The balun consists of balanced, open-circuited and short-circuited transmission line sections. The external balanced line connects to ports 1 and 2; the external unbalanced line connects to port 3.


This element does not have an assigned layout cell. You can assign artwork cells to any element. See “Assigning Artwork Cells to Layout of Schematic Elements” for details.


[1] R.Mongia, I.Bahl, P.Bhartia, RF and Microwave Coupled-Line Circuits, Norwood, MA: Artech House, 1999. Ch.11.

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