wilkinson combiner design

I am working on a monolithic CPW 4-way (maybe 8-way in the future) 2watts Wilkinson combiner with center freq 20GHz. BW is 4 GHz. The substrate is GaAs. The size is the major concern in this case. I want to use single-stage design to reduce the size.

The problem is that the 4 or 8 quater-wave transmission lines have to be parallel with equal spacing in this design. The spacing is somewhere around 100~150ums. Then how can I connect all the branches together into one node at the output, maintaining the same length of each branch?

I think one approach could be adding some extra bends to the branches close to the center to make it longer. But I do not have enough space to do that. Then what configuration or layout patten should I use? Thanks for the input!

Im my view it is not Wilkinson, if you do not proceed in treditinal way. However to get the solution because of space have a simple T junction and then Wilkinson divider.
Hope this solves the requirement.