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 ?
Faktorova, "Investigation of metamaterial structure influence on selective properties of microwave waveguide sensor", Electrical Review--Przeglad Elektrotechniczny, vol.
Designed for a wide range of laser power applications, MediSpec hollow silica waveguide fiber is available in 500, 750 and 1000 [micro sign]m inner diameters with a wavelength range from 2.
Curing of the wet silicone material to form clad films or core waveguide structures begins with application of ultraviolet (UV) light, followed by thermal setting of the material in an open air environment.
Polysilicon (amorphous silicon) is then deposited on the oxide layer which is serves as waveguide material by the LPCVD process.
In this study, "Generalized Telegraphist's Equations" [45] or transmission line equations for closed waveguide are utilized to generate the linear equation system of the MoM for the plasma column loaded cylindrical waveguide.
They can easily cover a 40% bandwidth and, if they could be incorporated into SWASS, would allow the full bandwidth available in the waveguide to be exploited.
Introduction of AWG (Arrayed Waveguide Grating) Industry: Along with Brief Introduction of AWG (Arrayed Waveguide Grating) Industry it includes Development of AWG (Arrayed Waveguide Grating) Industry and Status of AWG (Arrayed Waveguide Grating) Industry.
The new waveguide twists from Pasternack are in-stock and ready to ship now.
Where L is the waveguide length, [lambda] is the wavelength of the propagating optical signal in the waveguide, and n is the material refractive index, which given by
The problem arising independently of the excitation method is related to the continuity of the impulse response on the surface of the waveguide used for AET calibration.
The slotted waveguide array antennas have been used extensively for EO instrument application since they exhibit interesting performances such as high antenna gain efficiency low cross-polarization.