The Webb splitter takes the original quarter wave lines and reduces the length. In the way of compensation the line Z's diverge. Thus we generate a C step and an equivalent line extension, with extra C's, if required.
Here, again the line lengths are reduced and capacitors added to simulate the missing line length.
Here we get rid of the lines altogether by replacement with lumped elements.The ultimate in compact Wilkinson but with problems for frequencies > 10GHz.
The classical Bagley coupler is for n = odd splits. In the standard form the isolation is lousy, so really only suitable for passive systems. such as antenna arrays. (See antenna site for antenna array designs Visit Antennas ). Adding isolation resistors does give an improvement.
The Bagley splitter is a pure power splitter. The phase and group delay are not the same on each port.
There is a variant for n = even designs. More complicated to layout since the lines lengths are different over each port link.
