The HP Half Wave 50 ohm transmission line trick
If your 50 ohm microstrip transmission line varies somewhat in impedance when you are connecting 2 50 Ohm elements together you can use a 1/2 wave length of line in between the blocks if space is available and the design is narrow band. What will happen in a full spin around the Smith chart bringing the load end of the transmission line back to where is started at feed end.