waveguide


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waveguide,

device that controls the propagation of an electromagnetic wave so that the wave is forced to follow a path defined by the physical structure of the guide. Waveguides, which are useful chiefly at microwavemicrowave,
electromagnetic wave having a frequency range from 1,000 megahertz (MHz) to 300,000 MHz, corresponding to a wavelength range from 300 mm (about 12 in.) to 1 mm (about 0.04 in.). Like light waves, microwaves travel essentially in straight lines.
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 frequencies in such applications as connecting the output amplifier of a radar set to its antennaantenna
, in electronics, system of wires or other conductors used to transmit or receive radio or other electromagnetic waves (see radio); sometimes called an aerial. The idea of using an antenna was developed by Guglielmo Marconi (c.1897).
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, typically take the form of rectangular hollow metal tubes but have also been built into integrated circuits. A waveguide of a given dimension will not propagate electromagnetic waves lower than a certain frequency (the cutoff frequency). Generally speaking, the electric and magnetic fields of an electromagnetic wave have a number of possible arrangements when the wave is traveling through a waveguide. Each of these arrangements is known as a mode of propagation. Waveguides also have some use at optical frequencies.

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.

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.

waveguide

A rectangular, circular or elliptical tube through which electromagnetic waves are transmitted. An optical fiber is an optical waveguide.
References in periodicals archive ?
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Ruehle, "Propagation in twisted square waveguide," IEEE Trans.
2 Traction condition for immersed waveguide 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.
The PC waveguide is designed as a slab waveguide with coupling and bending sections.
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.
This new offeringbuilds on the successful implementation of MYAT's first elliptical waveguide installations made for channel allocations during the U.S.
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]).
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.
Tender issueobjective:the objective of this activity is to design manufacture and test low loss waveguides in ka q v and w-frequency bands for use in future high throughput satellite systems (transmit and receive bands).Targeted improvements: 20% reduction in insertion losses with respect to the state of the art.Description:conventional rectangular waveguides have high insertion loss per metre.