Hi, I'm in a bind trying to determine how to handle impedance matching through a joint of copper wire sandwiched between two 50-ohm coaxial cables (the joint is an interface between atmosphere and a UHV system). There is a signal pulse with a rise time of 2 ns coming through one of the coaxial cables, through the joint, and into the other cable, where it then continues through to a series of electronics. I am trying to avoid reflection as much as possible. Any ideas? Thank you very much.