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Directional couplers by Michael Ellis (et al)
A very interesting paper made by Michael Ellis Ph.D is available HERE.
The best theoretical performance available from a directional coupler, using ideal transformers, is a function of the turns ratio, and the terminating impedances. At VHF and UHF frequencies, wire gauge and core material can be chosen to closely approximate the response based on the solution of the reported equations.
A computer program made by the same author is presented HERE as a design aid.
An example of a wideband (lumped element) hybrid coupler design by using Microwave Office is reported HERE and HERE is reported the original text of the Joseph Cappucci's invention (patent US3514722) related to a network using cascaded quadrature couplers.
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