Positively coupled parallel lines.
The coupled lines are summed monotonically. There are three possiblities, symmetrical, asymmetrical and custom.
Symmetrical Multi-stage Couplers
The tight coupling is in the centre with a monotonic progression to the loose coupling on the exterior.
Asymmetrical Multi-stage Couplers
A progressive coupling from tight to loose along the length of the stages. Different types of progression.
A Custom Multi-stage Couplers
Choose the number of stages. Enter the coupling factor for each stage and see what you get.