Iseloomulik impedants on vahelduvvoolu signaalide (või kõrgsageduslike{0}}signaalide jaoks). Iseloomulik impedants on pika-liiniülekande mõiste. Signaali edastamise protsessis ülekandeliinis saavad signaali saabumise punktis ülekandeliin ja võrdlustasapind kokku. Tekib elektriväli ja elektrivälja olemasolu tõttu tekib hetkeline väike vool ja see väike vool eksisteerib ülekandeliini igas punktis. Samal ajal on signaalil ka teatud pinge, nii et signaali edastamise protsessis on ülekandeliini iga punkt samaväärne takistusega ja see takistus on meie mainitud ülekandeliini iseloomulik impedants.
The continuity of the characteristic impedance (ρ) basically depends on the stability of the ratio of the distribution parameters L{{0}} and C0. We all know Ohm's law: U=RI, where R is the resistance or resistance load, in ohms (Ω). Resistance is related to the resistivity (also known as conductivity) of metal materials, but in the process of high-frequency signal transmission, we also need to understand the transmission of the physical medium (such as twisted pair, coaxial wire, waveguide) that transmits high-frequency signals characteristics, which are different from low-frequency signals, this transmission characteristic is related to the conductive material of the transmission medium (such as copper or silver), conductivity (resistivity), geometry (most commonly cylindrical), distributed inductance (L0), distributed capacitance (C0), insulating material (dielectric constant), etc. are all related, but the influence of these distribution parameters and the dielectric constant of insulating material is often not considered during low-frequency signal transmission.
