waveguide


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waveguide

(wayv -gÿd) A metal tube, usually of rectangular cross section, down which traveling electromagnetic waves may be propagated. In a more general sense it is any system of material boundaries that fulfills the same purpose, such as layers of plasma in the ionosphere. Waveguides are used at microwave frequencies where dielectric losses in radio cables become excessive; they are therefore used as feeders in radio telescopes. The guided waves may be radiated away at the end of the waveguide by a horn antenna, which is a flared metal device having the dimensions of the waveguide at one end and opening out to a large aperture at the other end.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

waveguide

[′wāv‚gīd]
(electromagnetism)
Broadly, a device which constrains or guides the propagation of electromagnetic waves along a path defined by the physical construction of the waveguide; includes ducts, a pair of parallel wires, and a coaxial cable. Also known as microwave waveguide.
More specifically, a metallic tube which can confine and guide the propagation of electromagnetic waves in the lengthwise direction of the tube.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
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Ruehle, "Propagation in twisted square waveguide," IEEE Trans.
Arbitrary-Angle Single-Step Waveguide Twist for Quasi-Octave Bandwidth Performance
2 Traction condition for immersed waveguide in perfect fluid
Calculating Dispersion Relations for Waveguide Immersed in Perfect Fluid
In the electro-refractive modulators, an applied electrical field changes the real part of the effective RI of optical mode in the waveguide such that the phase of the propagating light is modulated.
Progress on Waveguide-Integrated Graphene Optoelectronics
The overall dimensions of the waveguide were L x W x H = 49 mm x 35 mm x 3 mm and channel length was set at four periods.
Line Defect-Layered EBG Waveguides in Dielectric Substrates
The Design of Rectangular-to-Circular Waveguide Transition
THE VARIATIONS OF OMNIDIRECTIONAL CIRCULARLY POLARIZED ANTENNAS FOR SATELLITE TELEMETRY/TELECOMMAND APPLICATIONS
This new offeringbuilds on the successful implementation of MYAT's first elliptical waveguide installations made for channel allocations during the U.S.
Introducing An Enabling Technology For ATSC 3.0 Adoption
Sol-gel silica planar single-mode (SM) waveguides incur a much lower coupling loss (e.g., 0.1 dB) than other optical waveguides that comprise semiconductor materials and polymers when coupled with SM fibers, and waveguide propagating loss is also much lower (e.g., 1 to 2 dB/[cm.sup.2]).
Fabricating 90 nm Resolution Structures in Sol-Gel Silica Optical Waveguides for Biosensor Applications
In order to clarify the waveguide behavior under well-defined conditions, qualitative wave propagation experiments were conducted using waveguides of three different materials, as well as various diameter and length combinations.
An Experimental Study of Acoustic Emission Waveguides

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