Balancing network
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In a hybrid set, hybrid coil, or resistance hybrid, balancing network is a circuit used to match, i.e., to balance, the impedance of a uniform transmission line, i.e., twisted metallic pair, over a selected range of frequencies. A balancing network is required to ensure isolation between the two ports of the four-wire side of the hybrid.
A balancing network can also be a device used between a balanced device or line and an unbalanced device or line for the purpose of transforming from balanced to unbalanced or from unbalanced to balanced.
Source: from Federal Standard 1037C and from MIL-STD-188
See also balun