Balun Transformer General Information
What is Balun Transformer?
Balun is name of device that can be like a
common mode choke,
unbalance to balance transformer,
or a step up or down transformer.
Balun
is an acronym of
BALanced UNbalanced,
it’s used to convert an unbalanced signal to a
balanced one or vice versa. A balun transformer is a device that:
● joins a balanced line (one that has two conductors, with equal currents in opposite directions,
such as a twisted pair cable).
● to an unbalanced line (one that has just one conductor and a ground, such as a coaxial cable).
Baluns isolate a transmission line and provide a balanced output. A typical use for a balun is in a
television antenna.
Balanced:
A method of transmitting signals using two signal lines. One line carries the source signal;
the other carries a signal of opposite phase (antiphase).
Unbalanced:
A method of transmitting signals using one signal line, with a ground line providing a
reference potential.
Why Use a Balun?
Baluns are used for two primary reasons:
● One : Eliminate “common mode current” on the transmission line.
● Two : Matching antenna impedance to the transmission line.
Version 2010
http://www.token.com.tw/
rfq token.com.tw
01 of 21
TOKEN [ TOKEN ELECTRONICS INDUSTRY CO., LTD. ]
