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An electrical device that interfaces balanced and unbalanced lines without disturbing each line's impedance.
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What is purpose of Balun transformer in RF front end
In you schematic, since both connectors are expecting to receive the "same" RF signal, it seems that the balun is being used to attenuate common mode signals , e.g. noise. … The common mode signals which are in phase in both lines, will cancel each other out through the opposite magnetic field generated by the balun. …