No distortion lines

The line in which the condition is met



and the attenuation coefficient does not depend on the frequency and at the same time has a minimum value, is called a line without distortion.

Characteristic impedance does not depend on frequency



Phase velocity
Does not depend on frequency or at high frequencies



Line without distortion at matched load, voltage and current coincide in phase at any point of the line. The energy of the magnetic and electric fields at any given time are equal to each other.



Cable lines without special devices are not suitable for transmission of speech, music over long distances.
The lines are suitable for transmission of speech, music over long distances, when the attenuation coefficient does not depend on the frequency or has a small value.