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Commonly used terms in the Electrical industry.
balun
a network for the transformation from an unbalanced transmission line, system or device to a balanced line, system or
device. Baluns are also used for impedance transformation. Derived from "balanced to unbalanced".
In antenna systems, baluns are used to connect dipole-type antennas to coaxial cable, to balance the current on dipole armatures, and to prevent currents from exciting the external surface of the coaxial shield.