# Impedance matching a variable transmission line

I have several transmission lines, each with different impedances. These lines are attached to an ADC receiver with a known impedance of 400ohm.

I would like to have an impedance matching network that matches the impedance for an arbitrary transmission line to my 400ohm receiver.

Is this possible? If not, does this mean I need a new impedance matcher for each transmission line of different impedance? I'm new to this so I just want a general idea of what I'm thinking about is possible. If not what do people typically do?

• What signal frequencies and what cable lengths are you talking about? Aug 17 '17 at 11:38

If the transmission lines are shorter than $\frac{\lambda}{20}$ or so at the maximum frequency, then you can pretty much ignore the transmission line properties, and treat them as lumped C or L, depending on whether the impedance is lower or higher than your 400 ohm receiver.