![]() ![]() However, the theory of transmission lines was historically developed to explain phenomena on very long telegraph lines, especially submarine telegraph cables. This applies especially to radio-frequency engineering because the short wavelengths mean that wave phenomena arise over very short distances (this can be as short as millimetres depending on frequency). The term applies when the conductors are long enough that the wave nature of the transmission must be taken into account. In electrical engineering, a transmission line is a specialized cable or other structure designed to conduct electromagnetic waves in a contained manner. One of the most common types of transmission line, coaxial cable. Black dots represent electrons, and the arrows show the electric field. Schematic of a wave moving rightward down a lossless two-wire transmission line. For the usage in acoustics, see Acoustic transmission line. For the movement of electrical energy, see Electric power transmission. ![]() This article is about the radio-frequency component. ![]()
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