| a device for transforming an unbalanced voltage to a balanced voltage or vice-versa
NOTE 1 – A balun is used, for example, to couple a balanced antenna to an unbalanced feed line.
NOTE 2 – The term is derived from "balanced to unbalanced transformer".
NOTE 3 – A balun may be realized in practice by using a transformer or a lumped parameter or distributed parameter network which may include active devices.
NOTE 4 – A balun may exhibit inherent impedance transformation differing from unity.
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