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An electrical device that interfaces balanced and unbalanced lines without disturbing each line's impedance.
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Antenna and balun for MRF49XA
If you read quickly the datasheet (page 73), you'll see that you have to use a balun circuit in order to match the IC's pins high input impedances to the antenna's impedance which is likely to be 50 \$ … The LNA, when connected
to the 50 \$\Omega\$ device, needs an external matching circuit
(Balun) for correct matching and to minimize the noise figure of the
receiver. …