Several types of transmission lines
1.Coaxial-cable and twisted-pair.They are often applied for connection from systems to systems.The characteristic impedance of coaxial cable is usually 50Ω and 75Ω,and twisted-pair cable is usually 110Ω.
2.Microstrip line in PCB.Microstrip line is a banding line(signal line),Separated from the ground plane by an electrical medium.If the thickness, width, and distance between the lines and ground are controllable, the characteristic impedance of the line can be controlled.
3.Strip line in PCB. The strip line is a copper line in the middle of the dielectric between two conductive planes.If the thickness ,width,dielectric constant and the distance between the two conductive planes are controllable, then the characteristic impedance of the strip line is controllable.
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