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Topic: Dielectric waveguide

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	Definition: dielectric waveguide
		dielectric waveguide: A waveguide that consists of a dielectric material surrounded by another dielectric material, such as air, glass, or plastic, with a lower refractive index.
		Note 1: An example of a dielectric waveguide is an optical fiber.
		Note 2: A metallic waveguide filled with a dielectric material is not a dielectric waveguide.
	www.its.bldrdoc.gov /fs-1037/dir-011/_1614.htm (68 words)

	Waveguide (Site not responding. Last check: 2007-10-08)
		Note 1: In the microwave regime, a waveguide normally consists of a hollow metallic conductor, usually rectangular, elliptical, or circular in cross section.
		Note 2: In the optical regime, a waveguide used as a long transmission line consists of a solid dielectric filament (optical fiber), usually circular in cross section.
		Waveguide propagation modes depend on the operating wavelength and polarization and the shape and size of the guide.
	www.ebroadcast.com.au /lookup/encyclopedia/wa/Waveguide.html (205 words)

	Power standard and accompanying dielectric waveguide research and development
		MilliLab's power standard development is supported by research in dielectric materials and especially in their application to dielectric waveguides.
		In MilliLab a dielectric waveguide in the input section had been estimated as a major new possibility for improving the power standard design for high millimetre wave frequencies.
		In this figure insertion losses are compared for sapphire waveguide sections (47 mm and 112 mm long) and a copper gold-plated waveguide section with approximately the same length as a long sapphire waveguide section (100 mm).
	www.tkk.fi /Units/Radio/research/dielectric.html (373 words)

	Waveguide-bonded optoelectronic devices (Site not responding. Last check: 2007-10-08)
		These devices are comprised of low-loss dielectric waveguides that are optically coupled to electronically active semiconductor elements that may provide functions such as in/out coupling and filtering of the guided light, absorption or generation of the light, and modulation of the amplitude and/or phase of the light.
		In general, the waveguides in these advanced devices are fabricated from a semiconductor material and thus tend to have a substantially higher loss and poorer coupling to optical fiber than do dielectric waveguides.
		The waveguide network consists of an input section 201, the splitter 204, and the interconnect segments 205-1 and 205-2 between the splitter 204 and the filters 206-1 and 206-2 as well as the interconnect segments 207-1 and 207-2 between the respective filters 206-1 and 206-2 and the respective photodetectors 208-1 and 208-2.
	typhoon.he.net /~sella001/patents/6852556.html (4997 words)

	Dielectric waveguide (Site not responding. Last check: 2007-10-08)
		The dielectric waveguide of this invention is fabricated from sintered or partially sintered polytetrafluoroethylene (PTFE) or a crystalline microporous polymer having a microstructure of nodes interconnected by fibrils.
		The dielectric is fabricated to have an increasing specific gravity from end 11 progressing to the right as indicated by the letters a, b and c.
		The dielectric waveguide and/or junction utilizing a porous crystalline polymer with a microstructure of nodes interconnected by fibrils.
	www.stickebana.com /scitech/printing/dielectric_waveguide.html (2159 words)

	Waveguides - Industrial 101.com
		Waveguides can be designed to carry waves over a large section of the electromagnetic spectrum, but they are especially helpful in the microwave and optical frequency ranges.
		RF or micro waveguides consist of hollow metal tubes that have a cross-section that is circular, elliptic or rectangular.
		A dielectric waveguide consists of a dielectric material that is surrounded by another dielectric material, such as air, glass, or plastic, with a lower refractive index.
	www.industrial101.com /electronics/waveguides.aspx (431 words)

	Waveguide (electromagnetism) - Wikipedia, the free encyclopedia
		Propagation in dielectric waveguide, may be viewed in the same way, with the waves confined to the dielectric by total internal reflection at its surface.
		Generally, the lower the frequency to be passed the larger the waveguide is. For example the natural waveguide[1] the earth forms given by the dimensions between the conductive Ionosphere and the ground as well as the circumference at the median altitude of the earth is resonant at 7.83 Hz.
		Electromagnetic waveguides are analyzed by solving Maxwell's equations, or their reduced form, the electromagnetic wave equation, with boundary conditions determined by the properties of the materials and their interfaces.
	en.wikipedia.org /wiki/Waveguide_(electromagnetism) (1068 words)

	Dielectric-Slab Waveguide (Site not responding. Last check: 2007-10-08)
		The boundary conditions require the electric and magnetic fields to be continuous across the surfaces of the dielectric slab.
		File Size: 762 KB The electric field of the symmetric TE mode is symmetric with respect to the center line of the waveguide.
		The cutoff frequency is the frequency at which the field outside the waveguide becomes not evanescent.
	www.ee.iastate.edu /~hsiu/descriptions/diele.html (206 words)

	Triple-pane waveguide window - Patent 4688009
		The dielectric constants of the side panes are preferably the square root of the dielectric constant of the central pane.
		Other prior art pertinent to the invention is the well-known canceling of the reflection at a single discontinuity between the media of different dielectric constants such as air and glass by a layer one-quarter wavelength thick of a dielectric with dielectric constant equal to the geometric average of the dielectric constants of the two media.
		The dielectric constants d2 and d3 of panes 18 and 20 are chosen to match the waves in the input waveguide 22 and output waveguide 24 to the wave in the central pane 16.
	www.freepatentsonline.com /4688009.html (1848 words)

	Optical film or strip waveguide having a dielectric waveguiding layer - Patent 5077822
		In an optical film or strip waveguide according to claim 1, wherein the metal layer is separated from the waveguiding layer by a dielectric layer.
		The propagation speed of the plasmons is essentially established by the thickness of the metal layer, the dielectric constant of the metal and the dielectric constant of the surrounding dielectrics.
		An adequate condition therefor that the propagation speed of the light is independent of the polarization in the waveguiding layer is comprised in the dimension of the layer thickness t.sub.3 of the metal layer that is to be selected essentially to: ##EQU2## wherein U.sub.j =2.pi./.lambda.(n.sup.2.sub.j -n.sup.2.sub.eff).sup.1/2, with j=1, 2, 3 and 4,.lambda.
	www.freepatentsonline.com /5077822.html (1965 words)

	Schweig, Edgard (1982-05-25) Dielectric waveguides for millimeter waves. ...
		Using our measurements of the dielectric parameters of KRS-5, we find that the losses are several orders of magnitude higher than the losses of conventional metallic waveguides.
		We use it to compute the modes of a rectangular dielectric waveguide and compare the numerical results to those obtained from Marcatili's closed-form solution.
		Waveguide methods have been extensively used at lower frequencies but this is the first application at 94 GHZ.
	etd.caltech.edu /etd/available/etd-09062006-152644 (473 words)

	[No title]
		The coupling is obtained by means of a metallic strip located on the inner or on the outer boundary of the dielectric ring; a strong coupling is obtained, even with a small width of the strip, in particular when the strip is on the inner boundary.
		It is shown that the Q factor of such resonators excited in whispering-gallery modes increases with azimuthal mode number due to the effective concentration of electromagnetic energy outside the dielectric in the inner region of the resonator as well as in the gap between the dielectric layers.
		When the linear dimensions of the dielectric disk (or ellipsoid or sphere) are reduced by three or four orders of magnitude in comparison with the dimensions of a microwave resonator, an optical dielectric microresonator can be constructed with roughly the same number of waves packed along a closed curve along the surface.
	www.math.cmu.edu /users/ion/s0007.txt (5770 words)

	K&L Microwave, Inc. - Filtering Solutions For Your Global Market (Site not responding. Last check: 2007-10-08)
		The IT5C50-10700/11700-E24-O/O is a tunable waveguide bandpass filter that maintains a constant bandwidth of 24 MHz with minimal insertion loss degradation over a 1 GHz band.
		The tunable dielectric waveguide is a high performance bandpass filter.
		K&L offers Broadband and Waveguide Directional Couplers from WR-137 through WR-28 with coupling values of 3 dB to 40 dB that have very low primary arm insertion loss, low V.S.W.R. and excellent directivity.
	www.klmicrowave.com /ecommerce/listproducts.asp?categoryid=13 (436 words)

	"Highly compact optical waveguides with a novel pedestal geometry", IEEE Photonic Tech. Lett., 1995 (Site not responding. Last check: 2007-10-08)
		The ratio of the waveguide width to thickness is taken to be 2 for this analysis.
		The Ge waveguide dimensions are similar to the ridge structure, but the waveguide etching is continued deeper into the substrate to form a GaAs pedestal underneath the waveguide.
		The front end of the high-index waveguide is slightly inserted into hollow opening of the coupler which essentially acts as a cavity whose three walls are metallic and one wall is a dielectric.
	www.wai.com /AppliedScience/Software/Emflex/Papers/emflex-PTL95.html (2090 words)

	Integrated Thin-Film Fluorescence Sensor
		Below the metal film is a dielectric buffer layer made of a material different from that of the waveguide layer.
		The buffer dielectric layer is thin enough to allow penetration of the surface plasmon electric fields into the sensing layer.
		The Corrugated Dielectric and Metal Layers of this device are designed to exploit evanescent-wave coupling and cross-coupling of surface plasmons so that fluorescent emission from nearby atoms or molecules to be detected is coupled to the sensing layer, while light at other wavelengths is not coupled to the sensing layer.
	www.nasatech.com /Briefs/Jan98/LEW16368.html (680 words)

	Waveguide (optics) - Wikipedia, the free encyclopedia
		Optical waveguides are used as components in integrated optical circuits or as the transmission medium in local and long haul optical communication systems.
		Optical waveguides can be classified according to their geometry (planar, strip, or fiber waveguides), mode structure (single-mode, multi-mode), refractive index distribution (step or gradient index) and material (glass, polymer, semiconductor).
		Optical fiber is typically a circular cross-section dielectric waveguide consisting of a dielectric material surrounded by another dielectric material with a lower refractive index.
	en.wikipedia.org /wiki/Waveguide_(optics) (497 words)

	Microwave - Cuming Corporation - Microwave Materials and Anechoic Chambers for the Offshore Oil, Marine Sciences, ... (Site not responding. Last check: 2007-10-08)
		These materials are useful in a variety of microwave and RF applications, including matching transformers, tapered transitions, dielectric spacers, antennas, and transmission lines.
		It is intended for filling cavities of electronic and microwave devices such as waveguides, instrument housings, and radomes.
		These materials have low dielectric constants and low loss tangents, making them ideal for use as dielectric substrates and as weather-proof RF transparent radomes.
	www.cumingcorp.com /microdm.php (1007 words)

	Optical fibre waveguide (Site not responding. Last check: 2007-10-08)
		The modal action of a waveguide is a consequence of the wave nature of the radiation.
		Waveguide imperfections account for low-level loss that is approximately constant with wavelength.
		Due to the modal behaviour, a waveguide is an intrinsically dispersive device.
	www.cs.ucl.ac.uk /staff/S.Bhatti/D51-notes/node21.html (912 words)

	An Electromagnetic Analysis of a Coupled Dielectric Waweguide Band Pass Filter
		It consists of several dielectric waveguides placed between two planar screens at y=0 and y=h (such a waveguide is called as HDW).
		Thus so-called non-radiative waveguide /3/ is not a subject of this article.
		It is known /4/ that the dominant mode of HDW valids to a two-dimensional Maxwell’s equations.
	jre.cplire.ru /win/oct00/3/text.html (2039 words)

	Definition: dielectric waveguide (Site not responding. Last check: 2007-10-08)
		dielectric waveguide: A waveguide that consists of a dielectric material surrounded by another dielectric material, such as air, glass, or plastic, with a lower refractive index.
		Note 1: An example of a dielectric waveguide is an optical fiber.
		Note 2: A metallic waveguide filled with a dielectric material is not a dielectric waveguide.
	glossary.its.bldrdoc.gov /fs-1037/dir-011/_1614.htm (68 words)

	S-Parameters Example : Dielectric Resonator WaveGuide Filter
		It is filled with a dielectric material at its two ports and at a central resonator section.
		Between the dielectric filled sections are two air filled sections.
		The air filled sections contain evanescent waves, while the dielectric sections have a relative permittivity of ten and contain propagating TE10 waves.
	www.electromagneticworks.com /hfworks_applications/hfworks_appa3.html (66 words)

	Lonngren Waveguide Chapter
		This chapter is meant to build upon the previous chapters’ presentations of such concepts as boundary conditions at conducting and dielectric interfaces, plane wave propagation, perpendicular, parallel and oblique incidence of plane waves on an interface, etc. The chapter is meant to be relatively standalone.
		Several of the topics, such as cylindrical or dielectric waveguides may be deferred to a point later in the course, or in a second semester, as they are covered at a level where a little more mathematical maturity would be beneficial.
		This section is mostly descriptive, covering some of the components that can be constructed from basic waveguide structures.
	www.scitechpub.com /Lonngren-Waveguide-Outline.htm (161 words)

	Ceramic Ribbons as Waveguides at Millimeter Wavelengths
		The achievable attenuation factor for an alumina-ribbon waveguide is less than 10 dB/km; as such, it is less than a hundredth of that of a typical ceramic dielectric rod waveguide, less than 1/200 of that of a customary metallic waveguide, and less than 1/300 of that of a microstripline at a frequency of 100 GHz.
		Instead, it is achieved primarily through selection of a cross-sectional geometry in conjunction with a reasonably low-loss dielectric material of suitable relative permittivity to support electromagnetic propagation in an inherently low-loss waveguide mode.
		The attenuation coefficient (a) of a dominant mode guided by a simple solid dielectric waveguide surrounded by lossless dry air depends on the loss factor and the permittivity of the dielectric material as well as the size and shape of the waveguide and the electromagnetic-field configuration in the particular mode.
	www.nasatech.com /Briefs/Apr01/NPO21001.html (550 words)

	Dielectric waveguide using powdered material (US4800350)
		A flexible low-loss dielectric waveguide is made from a flexible low-dielectric constant hollow cylinder filled with high-dielectric constant powder.
		Alternatively, a rigid or semi-rigid waveguide comprises a groove formed in a low-dielectric constant substrate filled with high-dielectric constant powder.
		(a) a waveguide housing made from a section of flexible low dielectric constant tubing which is operable to readily be bent to conform to any of various desired electrical waveguide and integrated circuit component shapes;
	www.delphion.com /details?pn=US04800350__ (231 words)

	Ultra Photonics Summary (Site not responding. Last check: 2007-10-08)
		Optically active waveguide materials can provide compact alternatives to fiber based amplifiers for meeting the requirements of integrated optoelectronic components.
		In this program Optically pumped dielectric waveguide amplifiers operating at 1300 nm and 1550 nm wavelength bands with Praesodymium (Pr) and Erbium (Er) doped Zirconia (Zr02) as the guide layer will be designed and tested.
		In FY97 the measurement of the waveguide parameters had commenced, and several deposition runs had been completed.
	www.darpa.mil /MTO/UltraPhotonics/overview/minnesota.html (214 words)

	NJIT - Department of Electrical & Computer Engineering:Analysis and Characterization of the Integrated Dielectric Slab ...
		A rigorous solution for the TE and TM polarization to the dielectric wedge antenna fed by a slab waveguide of the same material is presented.
		In contrast, for TM polarization, wedges with larger values of dielectric constant have essentially same directivity and HPBW as wedges of smaller dielectric constant material.
		Frequency characteristics are examined to show that the dielectric wedge antenna is a broadband antenna.
	ece.njit.edu /news/seminars/4_20_2005_a.php (315 words)

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