When an unbalanced transmission line is connected to a balanced
antenna (coaxial line to a dipole, for example), extraneous currents
run along the outer surface of the transmission line. So,
even though the impedances are the same, these extraneous currents
can cause unwanted radiation. This radiation can be minimised by
the use of a Balanced-to-unbalanced network .
A Balanced-to-unbalanced network
is placed between the antenna and the antenna feeder.
Other topics in our resources on Antennas related to Balanced-to-unbalanced network include: