Impedance of Smooth Lines, and Design of Simulating Networks

T HE transmission of alternating currents over any transmission line between specified terminal impedances depends only on the propagation constant and the characteristic impedance of the line (at the particular frequency contemplated). In this sense, then, the properties of transmission lines may be classed broadly as propagation characteristics and impedance characteristics. In telephony we are primarily concerned with the dependence of these characteristics on the frequency, over the telephonic frequency range.