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Does anyone know a single device that fulfills the following functionality? Unidirectional signal from top to bottom: At first two signals need to be coupled together. The result is then splitted into two branches.
It's Combiner-Splitter Combination, not Coupler..
If you attempt to combine 2 signals then divide these signals into 2 branches, you have to design a Wilkinson Combiner/Divider in a Cascade Configuration.Combiners are different.
I think that you want from this structure to have directivity, so a coupler is mandatory to be used.
I never seen these two components (coupler and splitter) in the same package. Should be possible to exist this device, but I never saw it.
Both components (coupler and splitter) can be designed on a PCB layout.
Depending by the design, and by the PCB properties, can be reached high frequency range.
Most of the commercial RF/EM simulators have models for couplers and splitters, which makes the project easier to be done.