To achieve a negative mutual inductance, the two coupled inductors L1 and L2 are wound'series-aiding '.
2.
This work was the basis on which network synthesis was built, although Cauer's work was not at first used much by engineers, partly because of the intervention of World War II, partly for reasons explained in the next section and partly because Cauer presented his results using topologies that required mutually coupled inductors and ideal transformers.
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