This article is about the radio-frequency component. For the movement of electrical energy, see Electric power transmission. For the usage in acoustics, see Acoustic transmission line.
Schematic of a wave moving rightward down a lossless two-wire transmission line. Black dots represent electrons, and the arrows show the electric field.One of the most common types of transmission line, coaxial cable
In electrical engineering, a transmission line is a specialized cable or other structure designed to conduct electromagnetic waves in a contained manner. The term applies when the conductors are long enough that the wave nature of the transmission must be taken into account. 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). However, the theory of transmission lines was historically developed to explain phenomena on very long telegraph lines, especially submarine telegraph cables.
Transmission lines are used for purposes such as connecting radio transmitters and receivers with their antennas (they are then called feed lines or feeders), distributing cable television signals, trunklines routing calls between telephone switching centres, computer network connections and high speed computer data buses. RF engineers commonly use short pieces of transmission line, usually in the form of printed planar transmission lines, arranged in certain patterns to build circuits such as filters. These circuits, known as distributed-element circuits, are an alternative to traditional circuits using discrete capacitors and inductors.
In electrical engineering, a transmissionline is a specialized cable or other structure designed to conduct electromagnetic waves in a contained manner...
Electric power transmission is the bulk movement of electrical energy from a generating site, such as a power plant, to an electrical substation. The interconnected...
An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy along large distances. It consists...
assumptions are no longer true and transmissionline theory must be used instead. With transmission lines, the geometry of the line is precisely controlled (in...
A transmissionline loudspeaker is a loudspeaker enclosure design which uses the topology of an acoustic transmissionline within the cabinet, compared...
interconnecting transmissionline to the antenna. Signals on a transmissionline will be transmitted without reflections if the transmissionline is terminated...
An acoustic transmissionline is the use of a long duct, which acts as an acoustic waveguide and is used to produce or transmit sound in an undistorted...
is used to support an overhead power line. In electrical grids, transmission towers carry high-voltage transmission lines that transport bulk electric power...
balun can be a distinct advantage. Transmissionline or choke baluns can be considered as simple forms of transmissionline transformers. This type is sometimes...
telecommunication, an artificial transmissionline is a two-port electrical network that has the characteristic impedance, transmission time delay, phase shift...
published in January 1939. While Smith had originally called it a "transmissionline chart" and other authors first used names like "reflection chart"...
Eastern Alberta TransmissionLine is a 485 km long, 500 kV, bipolar, high-voltage direct current, overhead transmissionline interconnecting Newell HVDC...
index of refraction, such as a glass surface, or in an electrical transmissionline to calculate how much of the electromagnetic wave is reflected by...
main types of transmission media: guided media—waves are guided along a solid medium such as a transmissionline; unguided media—transmission and reception...
of a uniform transmissionline is the ratio of the amplitudes of voltage and current of a wave travelling in one direction along the line in the absence...
characteristic impedance of a transmissionline or waveguide. Impedance mismatches result in standing waves along the transmissionline, and SWR is defined as...
or waveguide: Differential transmissionline: A differential transmissionline is a balanced two-conductor transmissionline in which the phase difference...
transmission is the process of sending or propagating an analog or digital signal via a medium that is wired, wireless, or fiber-optic. Transmission system...
incident wave at a discontinuity in the transmissionline. Consider a wave travelling through a transmissionline with a step in impedance from Z A {\displaystyle...
SunZia Transmission, a 550-mile 3-gigawatt HVDC transmissionline (890 km) to carry the power to Arizona and California. SunZia Wind and Transmission are...
"conventional transmissionline". The dual transmissionline structure can be implemented in practice by loading a host transmissionline with lumped series...
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