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Topic: Waveguide

In the News (Wed 3 Dec 08)

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	Wlan waveguide antenni
		The waveguide antenna can be equipped with a funnel which increases the sensitivity of the antenna simply by collecting hf signal from larger area.
		Tighting of the joint of the N connector and condenced water hole are similar as in the basic model.
		Lg is standing wavelength inside the tube, it is function of both Lo and Lc A waveguide which is closed on the other end acts similar as a short circuited coaxial cable.
	www.saunalahti.fi /elepal/antenna2.html (1151 words)

	Waveguide Primer - Microwave Encyclopedia - Microwaves101.com
		Waveguide manufacturers are the flsmiths of the microwave industry.
		Waveguides are metallic transmission lines that are used at microwave frequencies, typically to interconnect transmitters and receivers (transceivers) with antennas.
		When high power waveguide systems fail, the electrical arcs are usually between the top and bottom walls of the waveguide in the center where the voltage is greatest.
	www.microwaves101.com /encyclopedia/waveguide.cfm (1133 words)

	Waveguide Summary
		A waveguide is a device used primarily in the conduction and transmission of microwaves.
		Waveguides can be constructed to carry waves over a wide portion of the electromagnetic spectrum, but are especially useful in the microwave and optical frequency ranges.
		Waveguides used at optical frequencies are dielectric waveguides, structures in which a dielectric material with high permittivity, and thus high index of refraction, is surrounded by a material with lower permittivity.
	www.bookrags.com /Waveguide (664 words)

	Optical waveguide coupling device - Patent 4531809
		An optical waveguide coupling device as set forth in claim 1 wherein the thickness of the polymer film as well as the grating period and amplitude are a function of the wavelength of device operation.
		An optical waveguide coupling device as set forth in claim 1 wherein the grating period and thickness of the film is on the order of.lambda./1.5 where the factor 1.5 is the index of refraction of the polymer film at a transparent region thereof, and.lambda.
		The optical waveguide thus formed is characterized by the field for the waveguide mode being nearly zero at the metal interface, thus in effect eliminating the loss in energy in the substrate.
	www.freepatentsonline.com /4531809.html (3293 words)

	Ridged Waveguide and Transitions
		Ridged waveguide has long been in the domain of transmission lines and is useful for designing broad band impedance transitions between microstrip and waveguide or between finline structures and waveguide.
		In this document, formulae for cutoff wavelength and impedance are established for dual and single ridge waveguides and two examples are provided that illustrate the application to ridge transition design from waveguide to microstrip using a single ridge structure.
		Thus the ridge impedance does not converge upon that of the empty waveguide as should be expected, which is to say, the impedance of the unridged waveguide is not precisely attained.
	www.mathcad.com /Library/LibraryContent/MathML/singleridge.htm (464 words)

	TREVOR MARSHALL - Slotted Waveguide 802.11b WLAN antennas
		The waveguide airspace takes up the middle 1/2 of the bluespace, the rest is air infront of (to the left) and behind (to the right) the antenna.
		Waveguide antennas are fairly critical in their constructional dimensions, and are easiest to make with a CNC milling machine.
		Mount the N connector in the center of the widest side, 27.5mm from one end (the 'base') of the airspace in the waveguide and offset 10 mm from the centre line of the face, in the direction as the offset of the first slot..
	www.trevormarshall.com /waveguides.htm (3691 words)

	Waveguide Consulting, Inc. (Site not responding. Last check: )
		Waveguide was hired to design a new A/V presentation and videoconference facility for the Director of the CDC.
		Waveguide worked closely with the project architects to design the room's custom millwork to accommodate the A/V equipment in an aesthetically pleasing manner.
		In this endeavor, Waveguide is working closely with the Capitol staff and planners to document existing conduit runs, develop design standards, establish vendor standards and anticipate budget requirements to provide general design guidelines for any architects or consultants who provide design services for the Capitol.
	www.waveguide.com /proj_gov.html (358 words)

	CW Microwave - 2450 MHz Waveguide Components
		Waveguide bends are used to change direction of the waveguide transmission system.
		Waveguide transitions are used to connect between pieces of different waveguide size.
		Waveguide flanges are used to connect waveguide sections to one another.
	industrial.rell.com /ipgcw_2450waveguide.asp (401 words)

	Definition: waveguide (Site not responding. Last check: )
		Note 1: In the microwave regime, a waveguide normally consists of a hollow metallic conductor, usually rectangular, elliptical, or circular in cross section.
		This type of waveguide may, under certain conditions, contain a solid or gaseous dielectric material.
		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.
	www.its.bldrdoc.gov /projects/devglossary/_waveguide.html (131 words)

	SiON high-refractive-index waveguide and planar lightwave circuits
		The optical waveguide devices must be insensitive to the state of polarization of the propagating light.
		The light from the waveguide is thereby coupled to the small-core fiber with a diameter of ~3.5 µm, which is then spliced to a standard single-mode fiber with a core diameter of 9 µm.
		Waveguide loops or ring resonators with short circumference are required to obtain a wide filter repetition rate, or FSR.
	www.research.ibm.com /journal/rd/472/bona.html (5335 words)

	Radio-Electronics.Com :: Waveguide
		Waveguides are used in a variety of applications to carry radio frequency energy from one pint to another.
		In their broadest terms a waveguide is defined as a system of material that is designed to confine electromagnetic waves in a direction defined by its physical boundaries.
		Typically a waveguide is thought if as a transmission line comprising a hollow conducting tube, which may be rectangular or circular within which electromagnetic waves are propagated.
	www.radio-electronics.com /info/antennas/waveguide/waveguide.php (451 words)

	waveguide. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Waveguides, which are useful chiefly at microwave frequencies in such applications as connecting the output amplifier of a radar set to its antenna, 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.
	www.bartleby.com /65/wa/waveguid.html (184 words)

	Homebrew antenna shootout
		Waveguide antennas don't use the director assembly (the washery bits), and therefore are much simpler to build.
		It seems that the design formulas for the waveguide design made a sizeable difference in performance.
		With these results, I'm convinced that the waveguide design is the way to go for cheap wireless networking.
	www.turnpoint.net /wireless/has.html (872 words)

	IBM Software - CATIA Waveguide Diagrams 2 (WGD) - Add-on Overview
		When used with the CATIA Waveguide Design 2 (WAV) application, you can automatically input specification data captured in the diagram and use it to automate equipment placement, the selection of 3D components from catalogs, check Waveguide schematic lines for completion, query parts and check that all components are functionally and physically correct.
		Waveguides are electro-mechanical devices used to transmit and receive communication microwave signals.
		As components and Waveguide functions are created in the diagram, they will be automatically included in the appropriate Waveguide line and appropriate attribute information will be propagated to these objects.
	www-306.ibm.com /software/applications/plm/catiav5/prods/wgd (1008 words)

	Practical DIY Waveguides - Part 1
		In the context of waveguides this means that only a parallel sided duct is in fact a true “waveguide” for a plane wave, and that a flaring duct in order to be called a waveguide has to propagate parallel curved wavefronts.
		The area increase of this type of waveguide is parabolic, just like a conical horn, the difference is that its throat always coincides with the “y” axis, and thus has zero flare at the throat, the flare then increasing as to enable the wave front to be bent with the minimum of diffraction.
		Because the waveguide determines the angle of projection, the SPL across the front of the baffle is reduced considerably.
	sound.westhost.com /articles/waveguides1.htm (2898 words)

	Coplanar Waveguide- Microwave Encyclopedia - Microwaves101.com
		"Classic" coplanar waveguide (CPW) is formed from a conductor separated from a pair of groundplanes, all on the same plane, atop a dielectric medium.
		A variant of coplanar waveguide is formed when a ground plane is provided on the opposite side of the dielectric, which is called finite ground-plane coplanar waveguide (FGCPW), or more simply, grounded coplanar waveguide (GCPW).
		The advantages of coplanar waveguide are that active devices can be mounted on top of the circuit, like on microstrip.
	www.microwaves101.com /encyclopedia/coplanarwaveguide.cfm (907 words)

	The Design and Performance of the REM Ribbon Emulation Manifold Waveguide
		At high frequencies, the REM waveguide takes the exit from a compression driver and creates a sound field that is narrow vertically and wide horizontally — matching the narrow vertical pattern created by the summation of the many direct radiating low frequency transducers.
		The length and shape of each waveguide channel is designed to carefully guide the output from the compression driver and to ensure that the distinct output of each waveguide channel is in-phase with the other outputs.
		Clearly, waveguides that have a constant cross-sectional area along the length of the waveguide create distortion that is a linear function of distance.
	www.meyersound.com /support/papers/REM (1493 words)

	Accelerator : Waveguides (SLAC VVC)
		A waveguide is an evacuated rectangular copper pipe.
		The size of the waveguide must be a multiple of the wavelength of the wave, so waveguides are only practical for electromagnetic waves in the microwave range, with wavelengths on the scale of a few centimeters.
		For the very high microwave intensities used at SLAC, the waveguide must be evacuated (placed under vacuum) because the intense electric fields would breakdown through lightning-like spark formation if air were present in the pipe.
	www2.slac.stanford.edu /vvc/accelerators/waveguide.html (247 words)

	DirectionalWaveguide - Seattle Wireless
		Waveguide antenna is a type of DirectionalAntenna and is a modified waveguide.
		Waveguide antennas are often enhanced with funnel shaped structures on the open end to increase their gain (an example of this design is CookieCantenna).
		Not to be confused with SlottedWaveguide, another type of waveguide antenna that is flat and tall in shape, and may be either unidirectional or omnidirectional.
	www.seattlewireless.net /index.cgi/DirectionalWaveguide (385 words)

	Waveguide Dimensions Amateur Radio Microwaves Uses from WA1MBA
		And it is possible to use some waveguide sizes on ham bands that are outside of the normal operating frequency.
		The easiest way to tell a waveguide size is to bring along a ruler or a caliper when you go to a hamfest.
		The actual size of each waveguide is up to a few thousandths of an inch from this, so the WR-size is rounded to the nearest hundredth of an inch.
	www.wa1mba.org /wavegd.htm (1659 words)

	K&L Microwave, Inc. - Filtering Solutions For Your Global Market
		Rectangular waveguides are available from 1 to 20% bandwidth with 2 to 20 sections.
		Waveguide filters come with any choice of connectors or flange mounts available for your frequency range.
		K&L offers circular mode waveguide filters that are Te 111 mode filters available from.1 to 1.8% bandwidth.
	www.klmicrowave.com /ecommerce/listcategory.asp?categoryid=13 (238 words)

	Waveguide and Cavity Modes (Sound)
		Waveguide modes can be thought of as consisting of sets of plane waves reflecting from the walls.
		The main utility of modal analysis for the purpose of room acoustics is to calculate the resonant frequencies of a room.
		A waveguide can be thought of as a tunnel that extends an infinite distance in the ±x direction.
	www.silcom.com /~aludwig/Physics/Main/Cavity_modes.html (1259 words)

	Waveguide Devices
		The discussion of waveguides, up to this point, has been concerned only with the transfer of energy from one point to another.
		The coupler illustrated in figure 1-53 is constructed from an enclosed waveguide section of the same dimensions as the waveguide in which the energy is to be sampled.
		The magnitude of the sample, however, is proportional to the magnitude of the energy in the waveguide.
	www.tpub.com /neets/book11/44l.htm (749 words)

	Waveguide Components (AIRCOM Inc.)
		Waveguide components have been designed, manufactured, and stocked by Aircom, Inc. for 45 years.
		More than 1300 different waveguide components are currently available either from stock or with reasonable delivery times.
		Precision measurement waveguide components and high-power waveguide components are a major feature of our product line.
	www.waveguide-components.com (100 words)

	Digital Waveguide Theory
		In this appendix, the basic principles of digital waveguide acoustic modeling are derived from a mathematical point of view.
		These traveling waves are then digitized by ordinary sampling, resulting in the digital waveguide model for the ideal string.
		The digital waveguide simulation is then shown to be equivalent to the finite-difference recursion obtained earlier.
	ccrma.stanford.edu /~jos/pasp/Digital_Waveguide_Theory.html (209 words)

	waveguide - a definition from Whatis.com
		A waveguide is an electromagnetic feed line used in microwave communications, broadcasting, and radar installations.
		A waveguide consists of a rectangular or cylindrical metal tube or pipe.
		An electromagnetic field can propagate along a waveguide in various ways.� Two common modes are known as transverse-magnetic (TM) and transverse-electric (TE).� In TM mode, the magnetic lines of flux are perpendicular to the axis of the waveguide.
	whatis.techtarget.com /definition/0,,sid9_gci214326,00.html (190 words)

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