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The question is still fairly unclear but I'll take a shot. A combiner could be a Wilkinson, but I've seen hybrid couplers be used. I think the hybrid is sometimes favored in high power applications since it is physically easier to heat sink the terminating resistor since it must be grounded. The Wilkinson is not grounded and the challenge would be how to dissipate the power to the chassis.
A standard wilkinson works best at one frequency--its midband. At that one point, it has excellent isolation, and a vswr null.
Unfortunately, if you need broadband performance, the isolation and vswr rapidly deteriorate +/- from the center frequency.
By adding an input quarterwave matching section, and adjusting the impednace of the two lines after the split, you can get slightly broader band performance by sacrificing the excellent performance right at the center frequency. Think of it as a chebychev type ripple response.
I would guess that a 2 section standard wilkinson would do better than a one section compensated, but you can do the analysis to see if that was true.
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