Multistage couplers are used to increase the bandwidth and coupling factor. A response ripple can be factored in to increase even further the operational bandwidth. There are two possible coupler configuration. All results are supplied AS IS, no responsablity is taken for any consequence of usage.
Here each coupler section has a positive coupling factor. Often results in a centre section of very high coupling.
Choose the number of stages. Enter the coupling factor for each stage and see what you get.