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	Waveguide Loss -- Recommendations and Resources (Site not responding. Last check: 2007-10-31)
		In hollow metallic waveguides, the fundamental modes are the transverse electric TE mode for rectangular and TE for circular waveguides, seen here in cross-section: A dielectric waveguide is a waveguide that consists of a dielectric material surrounded by another dielectric material, such as air, glass, or plastic, with a lower refractive index.
		The spacing of the slots is critical and is a multiple of the wavelength used for transmission and reception.
		Although waveguides such as a acoustic tubes may be thought of as three-dimensional, because their lengths are often much greater than their cross-sectional area, it is reasonable and computationally efficient to model them as one dimensional waveguides.
	www.becomingapediatrician.com /health/166/waveguide-loss.html (1063 words)

	Edge slotted waveguide antenna array with selectable radiation direction - Patent 4229745
		Slots for radiation are cut in both narrow walls of each such waveguides, and PIN diodes across the slots are selectably forward and backward biased to effectively open the slots along one waveguide narrow wall while the others are closed and, alternatively, vice verse.
		The slots of either side are essentially opened or closed in accordance with the non-conducting or conducting condition of RF diodes placed at least one to a slot across the slot orthogonally.
		Since both slots of the dual-slot version, namely slots 37 and 38, are to be opened and closed at the same time and under the same circumstances, leads 42 and 43 would be essentially parallel through an appropriate series resistor to a switch such as 24 in FIG.
	www.freepatentsonline.com /4229745.html (2115 words)

	Slotted waveguide Information
		A slotted waveguide is a waveguide that is used as an antenna in microwave radar applications.
		The spacing of the slots is critical and is a multiple of the wavelength used for transmission and reception.
		Without augmentation a slotted waveguide is not as efficient as a parabolic reflector, lacking an ability to focus in the vertical plane, but is much more durable and is less expensive to construct.
	www.bookrags.com /Slotted_waveguide (443 words)

	Tapered-width leaky-waveguide antenna - Patent 4518967
		The length (m) of each slot (2) gradually increases as one traverses the waveguide (1) along the direction of propagation, whereas the width (W) of the wall of the waveguide (1) in which the slots (2) are cut gradually decreases as one traverses the waveguide (1) along the direction of propagation.
		However, this patent teaches away from the present invention in that the waveguide tapers in the same direction that the length of the slots taper (the presence of wedge shaped dielectric 20 increases the electrical width of the waveguide), whereas in the present invention the waveguide and slots taper in opposite directions.
		A slotted leaky-waveguide traveling wave antenna has slots (2) whose lengths (m) gradually increase as one traverses the waveguide (1) in the direction of wave propagation, whereas the width (W) of the waveguide (1) gradually decreases as one traverses the waveguide (1) in the direction of wave propagation.
	www.freepatentsonline.com /4518967.html (2635 words)

	10 GHz waveguide slot antenna (Site not responding. Last check: 2007-10-31)
		A slotted waveguide antenna works by radiating energy from the inside though a number of slots cut in the waveguide.
		Each slot acts as a (slotted) dipole, with the polarity opposite the direction of the slot.
		The waveguide between the two sections must be more than 1 wavelength long to ensure a well behaved field before the radiating section.
	hjem.get2net.dk /ole_nykjaer/oz2oe/antenner/10wg.html (229 words)

	Circumferential slotted ridged waveguide array antenna - Patent 4658261 (Site not responding. Last check: 2007-10-31)
		An antenna as recited in claim 3 wherein said slots are disposed in two parallel rows which are equidistant from a longitudinal centerline of said outside wall, the slots adjacent to the feedpoint being on the same side of the longitudinal centerline, adjacent slots on each side of the longitudinal centerline being in different rows.
		Adjacent slots 26 are spaced center to center in the longitudinal plane, nominally at a distance equal to one-half of the wavelength (.lambda.g) of the center operating frequency in the waveguide.
		The dimensions of the waveguide cavity, which are chosen by conventional rectangular waveguide design principles, are 2.19 inches for the width (a), 0.535 inches for height (b), 0.800 inches for the ridge width (s), and 0.156 inches for the gap (d).
	www.freepatentsonline.com /4658261.html (1731 words)

	TREVOR MARSHALL - Slotted Waveguide 802.11b WLAN antennas
		The first slot is centered 1.0 wavelength from the base, at a maximum of the H field in the waveguide.
		Slots 2 thru 8 are centered at distances of 240, 320, 400, 480, 560, 640 and 720mm from the base of the airspace, staggerred across the centerline.
		The slot width for the 16 slotter stays the same at 15mm, and the slot length should be 58mm.
	trevormarshall.com /waveguides.htm (3691 words)

	Welcome to Adobe GoLive 6 (Site not responding. Last check: 2007-10-31)
		This is accomplished by using a slotted waveguide fixed to the bottom of the azimuth arm.
		A 5-probe tuner at the junction of the WR2100 and the slotted waveguide eliminates reflections that would be produced at this junction.
		Power from the collector enters the carriage house though a length of corrugated waveguide and is connected to a turnstile junction.
	www.naic.edu /aisr/sas/transmitter/trans-platform.html (305 words)

	Slotted waveguide - Wikipedia, the free encyclopedia
		The slotted waveguide antenna used by radar for traffic observation (see highlighted area).
		The antenna's vertical focus is usually enhanced by the application of a microwave lens attached to the front of the antenna.
		They are used primarily to determine the precise position of the train when it is being brought to a halt at a station, so that the doorway positions will align correctly with queuing points on the platform (or with a second set of safety doors should such be provided).
	en.wikipedia.org /wiki/Slotted_waveguide (466 words)

	Slotted Spoon
		1) " Slotted" -- In the context of Slotted Spoon
		Waveguide 17: A slotted waveguide is generally used for radar and o
		Screw 81: The most common screw drives are the slotted and Phillips; hex, Robertson, and torx are also c 86: ''(a) Slotted, (b) Phillips, (c) Pozidriv, (d) Torx, (e) Hex, (88:, and is driven by a flat-bladedhttp:/.
	www.lottery-news.net /dust210-slotted_spoon.html (614 words)

	Highbeam Encyclopedia - Search Results for waveguide
		waveguide WAVEGUIDE [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 microwave frequencies in such applications as connecting the output amplifier of
		Frequency-independent waveguide attenuator with a resistive film in the diagonal plane.
	www.encyclopedia.com /SearchResults.aspx?Q=waveguide (307 words)

	EXPERIMENT 4 , POSITIVE RESULT, (performed 20/08/99).
		The waveguide is orientated in the direction of Leo (11h of right ascension) and the two ways for the travelling waves are obtained in changing the end used to send the wave.
		One signal is used to power the long waveguide through a faraday effect variable phase shifter, and the other two to bias the double balanced mixers used as phase detectors.
		After, the right antenna in the slotted waveguide part is adjusted in order to obtain a nil DC signal at the output of the right double balanced mixer.
	pages.sbcglobal.net /webster.kehr/DeWitte/exp4.htm (729 words)

	AN AFFORDABLE SCANNING ARRAY USING (Site not responding. Last check: 2007-10-31)
		The slotted waveguide array with associated phase shifters is used to scan the beam in azimuth plane and the Radant lens is used to scan the beam in the elevation plane.
		These conclusions are reached by comparing the antenna patterns of the slotted waveguide array by itself with the patterns for the slotted waveguide array with the Radant lens mounted in front of it.
		The slotted waveguide array with the associated phase shifters at each column is used to scan the beam in the azimuth plane and the Radant lens is used to scan the beam in the elevation plane.
	www.ecs.umass.edu /ece/allerton/papers1999/24 (3026 words)

	COPDC: Optics & Waves: Demonstrations of Electromagnetic Radiation with the Welsh Microwave Optics Set (Site not responding. Last check: 2007-10-31)
		Next to it is the main waveguide containing the klystron, variable flap attenuator, the frequency meter and the sliding probe on the slotted waveguide section.
		The microwave energy is transmitted into the waveguide by an antenna attached to the cavity of the klystron and protruding into the waveguide from the bottom of the tube.
		Insert the piece of rectangular waveguide between the horns with its broad and narrow walls in the same planes as the broad and narrow walls of the main waveguide.
	physicsnt.clemson.edu /physdemo/cat/optics/microwav.htm (4182 words)

	Microwave Slot Antennas (Site not responding. Last check: 2007-10-31)
		Slot antennas can be used for fixed stations, satellite ground stations and beacons.
		Slot antennas can be built from surplus waveguide sections, which will give an omni-directional pattern and horizontal polarization.
		The simplest feed for the slot antenna is to use a coaxial to waveguide transition.
	members.ij.net /packrats/Slot_Antenna/slot.html (651 words)

	The Microwave Facilitated Atmospheric Energy Projection System (MFAEPS) : AZ IMC (Site not responding. Last check: 2007-10-31)
		The system of claim 23, further comprising two slotted waveguide phased array antenna panels placed on either side of the first antenna and oriented to project microwave energy in the same direction as the first antenna.
		For greater distance energy projection, in addition to the initial central microwave antenna 13, slotted waveguide phased arrays 63 may be assembled parallel to the central antenna 13.
		The beams generated by the slotted waveguide phased array 63 augment heating of the column 5 as they coalesce with the diverging central beam.
	arizona.indymedia.org /print.php?id=31360 (6660 words)

	10 GHz Omnidirectional Antenna
		There is no shortage of information on how to design slotted waveguide antennas, but to actually make them can become a problem without relatively sophisticated machining facilities, especially when you get to the higher frequencies.
		A normal slotted waveguide antenna has the slots in the broad face of the waveguide.
		The waveguide must be exactly a multiple of one half guide wavelength long between short circuits at the operating frequency.
	www.qsl.net /g3yki/omni.htm (488 words)

	Planar antenna with patch radiators (US4755821)
		A planar antenna includes a first slotted waveguide serving as a power-feed unit, and a second slotted waveguide of planar type coupled with the power-feed waveguide, for radiating circularly polarized microwaves into space.
		The second waveguide has a metal plate in which a two-dimensional slot array consisting of a plurality of rows of slots is formed.
		These patch radiators are electromagnetically coupled with the slots, respectively, in such a manner that each radiator is directly excited by the corresponding slot through the insulative layer, thereby radiating circularly polarized microwaves.
	www.delphion.com /details?pn10=US04755821 (288 words)

	Waveguide (electromagnetism) - Wikipedia, the free encyclopedia
		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.
		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.
	en.wikipedia.org /wiki/Waveguide_(electromagnetism) (1071 words)

	Pubblicazioni
		A strategy for the full-wave analysis of slotted waveguide planar arrays is presented and demonstrated.
		The core of the method is a suitable segmentation of the antenna into two fundamental regions: an ‘internal’ one, formed by the waveguide circuit, and the ‘external’ one, consisting of the half space above the plate where the radiating slots are located.
		Optimization is performed on the phases of the feeders -row by row- which the modal voltages across the slots, modeled as section of nearly rectangular waveguides, depend on.
	deb.univpm.it /Venanzoni/pubblicazioni.htm (2348 words)

	Vadim Yakovlev's Student Projects' Page: 2001-2002 ISP (Site not responding. Last check: 2007-10-31)
		Waveguide-fed slot antenna arrays have been used as a resonant and traveling-wave antennas in many ground-based and airborne radar systems.
		In these arrays, a desired radiation pattern can be created by adjustment of the position of the slots in the waveguide wall.
		Analyzed structure consisting of a cavity/resonator (1), a slotted waveguide (2), and a load (3).
	users.wpi.edu /~vadim/Projects/WUT_02-03.html (331 words)

	PLANETaXis - downpipe waveguides (Site not responding. Last check: 2007-10-31)
		Many people had expressed their doubts about the downpipe waveguides, but for the price I figured I may aswell build both and compare the performance.
		The purpose of this article is to highlight the differences between designs, and investigate the waveguide performance.
		This is slightly wrong for the dimension of pipe, and may affect tilt and centre frequency (maybe channel 11).
	members.iinet.net.au /~mtszolk/wireless/downpipe.cgi (513 words)

	(WO/2000/019784) SLOTTED WAVEGUIDE STRUCTURE FOR GENERATING PLASMA DISCHARGES (Site not responding. Last check: 2007-10-31)
		The slot (3) is configured such that a high voltage is generated across the slot (3) when the waveguide (2) is excited with high-power microwaves.
		The strong electric fields generated in the region of the slot can be used to produce a non-equilibrium plasma discharge (7) in a working gas (9) in the vicinity of the slot (3).
		The slotted waveguide structure (1) is designed to operate as a traveling wave structure with microwave energy uniformly dissipated along the length of the slot (3).
	www.wipo.int /pctdb/en/wo.jsp?KEY=00/19784.000406 (330 words)

	Microwave waveguide Components (Site not responding. Last check: 2007-10-31)
		Series 030 of Slotted Lines are designed to facilitate the very accurate measurement of VSWR and impedance in waveguide.
		Flann Waveguide bends are available in E and H Plane configurations with an angle of 90 degrees.
		Flann Twists are manufactured from sections of standard waveguide which have been precisely twisted whilst maintaining the internal waveguide dimensions.
	www.flann.com /Products_Home/Components/components.html (482 words)

	[No title] (Site not responding. Last check: 2007-10-31)
		The problem of scattering from a large planar slotted waveguide array antenna is investigated.
		Numerical results are presented to demonstrate the effects of a variety of factors on the radar cross section (RCS) of a slot array, and these include the number of basis functions in the MoM solution, the external mutual coupling between the slots, the waveguide terminations, and the host object.
		The RCS of a complicated real slot array is given finally to demonstrate the capability of the numerical method as well as the distinct features of its RCS pattern.
	jin.ece.uiuc.edu /abstracts/p64.html (203 words)

	Satellite communications on-the-move
		We designed a slotted waveguide, low-profile, mechanically scanned tracking-antenna system for receiving a Ku-band GBS signal from the SBS-6 satellite.
		A standard commercial waveguide low-noise-block downconverter with a noise figure of about 0.75 dB was used for the prototype antenna.
		We built a slotted waveguide antenna using rate sensors and return-signal-strength indicator for positioning, with a motion range of 360 degrees in azimuth and plus-or-minus 15 degrees elevation at a squint angle of 45 degrees.
	www.gordon.army.mil /AC/sumr01/gbscotm.htm (1612 words)

	Waveguide Components (AIRCOM Inc.)
		Waveguide components have been designed, manufactured, and stocked by Aircom, Inc. for 45 years.
		Precision measurement waveguide components and high-power waveguide components are a major feature of our product line.
		We have a number of exclusive products, one example of which is our high-power variable directional coupler which, in it's most advance configuration, has coupling that is insensitive to frequency over the operating frequency range.
	www.waveguide-components.com (100 words)

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