You have to make a blood sacrifice to the Voodoo gods in high speed electronics if you want it to work (is the saying, anyway) - i.e. the actual shape of the tr

You have to make a blood sacrifice to the Voodoo gods in high speed electronics if you want it to work (is the saying, anyway) - i.e. the actual shape of the traces on the PCB starts to become important, and one can use this fact to form things like filters and directional couplers.