directional coupler


Also found in: Acronyms, Wikipedia.

directional coupler

[də′rek·shən·əl ′kəp·lər]
(electronics)
A device that couples a secondary system only to a wave traveling in a particular direction in a primary transmission system, while completely ignoring a wave traveling in the opposite direction. Also known as directive feed.

Directional Coupler

 

a device consisting of two sections of radio waveguides. A fraction of the electromagnetic-wave energy propagating through the main waveguide is shunted into an auxiliary waveguide by using coupling links; in the auxiliary waveguide the energy is transmitted only in a specific direction. If the wave-propagation direction in the main waveguide is reversed, then the propagation direction of the shunted wave in the auxiliary waveguide will also be reversed. The unidirectional propagation in the auxiliary waveguide results from the interference of the waves that are excited in it. The superposition of these waves in one direction results in cancellation of the waves; superposition in the other direction results in the formation of the summed shunted wave. Examples of coupling links between two waveguides are (1) apertures in adjacent walls and (2) loops. Directional couplers are widely used in superhigh-frequency apparatus (frequencies from 30 megahertz to 300 gigahertz) for splitting or combining the energies of waves; for determining the wave direction, power, and phase; and for other applications.

REFERENCES

Lebedev, I. V. Tekhnika i pribory sverkhvysokikh chastot, vol. 1. Moscow-Leningrad, 1961.
Altman, J. Ustroistva sverkhvysokikh chastot. Moscow, 1968. (Translated from English.)

L. S. OSIPOV

directional coupler

(communications)
(tap) A passive device used in cable systems to divide and combine radio frequency signals. A directional coupler has at least three ports: line in, line out, and the tap. The signal passes between line in and line out ports with loss referred to as the insertion loss. A small portion of the signal power applied to the line in port passes to the tap port. A signal applied to the tap port is passed to the line in port less the tap attenuation value. The tap signals are isolated from the line out port to prevent reflections. A signal applied to the line out port passes to the line in port and is isolated from the tap port. Some devices provide more than one tap output line (multi-taps).
References in periodicals archive ?
a supplier of on-demand microwave and RF components, introduces their new family of precision waveguide directional couplers.
Utilizing Land Grid Array (LGA) packaging technology, AVX's new 10W 3dB directional couplers feature an inherently low profile, low parasitics, excellent solderability, and improved heat dissipation in addition to self-alignment during reflow.
SDP offer many of the passive components such as Directional couplers, Splitters, Tappers, High Power Terminations, Attenuators and POIs (Point of Interface).
Metamaterial solutions available from Rayspan today include a broad line of single and multi-band antennas and arrays together with complementary directional couplers, power combiners and power splitters.
have left the opening chapters on microwave network theory, characteristics of planar transmission lines, analysis of uniformly coupled lines, broadband forward-wave directional couplers, parallel- coupled TEM directional couplers, and nonuniform broadband TEM directional couplers largely untouched, save for some additions and changes made to accommodate the multiplayer design of coupled lines.
The Broadband Directional Couplers are available from .
After introducing the nomenclature and notations, seven chapters discuss integrated optics, including coverage of step-index thin-film waveguides, graded-index thin-film waveguides, propagation loss in thin-film waveguides, three-dimensional waveguides with rectangular boundaries, optical directional couplers and their applications, guided-wave gratings, and arrayed-waveguide gratings.
Coverage includes microwave network analysis, impedance matching, directional couplers and hybrids, microwave filters, ferrite devices, noise, nonlinear effects, and the design of microwave oscillators, amplifiers, and mixers.
The Company's portfolio includes amplifiers, attenuators, detectors, diodes, directional couplers, front-end modules, hybrids, infrastructure RF subsystems, mixers/demodulators, optocouplers, optoisolators, phase shifters, PLLs/synthesizers/VCOs, power dividers/combiners, receivers, switches and technical ceramics.
RFS offerings include aluminum and copper plenum-rated coaxial cables, as well as LTE-ready plenum-rated, PIM-certified omni-directional antennas, low-PIM directional couplers and power dividers, connectors, tools, jumpers, and more.
The Company's portfolio includes amplifiers, attenuators, circulators, detectors, diodes, directional couplers, front-end modules, hybrids, infrastructure RF subsystems, isolators, mixers/demodulators, optocouplers, optoisolators, phase shifters, PLLs/synthesizers/VCOs, power dividers/combiners, receivers, switches and technical ceramics.
Both aluminum and copper plenum-rated coaxial cables are included in its portfolio, as well as PIM-rated LTE indoor antennas, low-PIM directional couplers and power dividers, connectors, tools, jumpers and more.

Full browser ?