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| Number | Title | Issue Date |
| 8179213 | Electromagnetic wave transmission medium comprising a flexible circular tube with a solid circle shaped ridge disposed therein Provided is an electromagnetic wave transmission medium which is suited for mass production and does not affect a transmission mode. The electromagnetic wave transmission medium includes, as a main element, a flexible cylindrical tube (1) molded so that a cro... | 05/15/2012 |
| 7339447 | High-voltage transformer coil with acoustic wave guiding function The present invention relates to a high-voltage transformer coil with acoustic wave guiding function, which comprises a plurality of wound wires, an insulated material for packaging said wound wires to form a coil, a high-voltage connector formed on a side of said c... | 03/04/2008 |
| 7319717 | Device and method for enabling communications signals using a medium voltage power line In one embodiment, a device for enabling communications signals over a medium voltage power line includes a first modem, a second modem, a third modem, and one or more switches. The first modem is electrically coupled to a medium voltage power line and is adapted to... | 01/15/2008 |
| 7249613 | Energy attenuation device An energy attenuation device for a conduit that is adapted to convey a pressurized fluid therethrough, comprising a hose section disposed about a portion of the conduit, wherein such conduit portion is provided with at least one aperture, for example in a surface th... | 07/31/2007 |
| 7218190 | Waveguides and scattering devices incorporating epsilon-negative and/or mu-negative slabs Waveguides and scattering devices are made from a pair of slabs, at least one slab being either an “epsilon-negative (ENG)” layer in which the real part of permittivity is assumed to be negative while its permeability has positive real part, or a “mu-negative ... | 05/15/2007 |
| 7077165 | Double pipe A double pipe has an outer pipe and an inner pipe that is formed in a spiral or wavy configuration and is held by an inner circumferential face of the outer pipe. ... | 07/18/2006 |
| 7046164 | Method and system for well telemetry Methods and systems for borehole telemetry are disclosed. In one embodiment, a borehole telemetry system includes a coiled tubing string that is located in the borehole. A receiver is coupled to the coiled tubing string. In one possible implementation, the receiver ... | 05/16/2006 |
| 7036530 | Energy attenuation device for a fluid-conveying line and method of attenuating energy in such a line An energy attenuation device for a fluid-conveying line, and a method for attenuating energy in such a line, are provided. The device includes one or more hose sections disposed in the fluid-conveying line, and at least one spring disposed in at least a portion of e... | 05/02/2006 |
| 6859180 | Gravity-actuated submarine antenna An antenna including a feed tube with radial fins and circular plates at the ends of the tube and fins thereby forming a boundary for a plurality of resonant cavities. Curved plates, connected to the tube by switches of a switching system, partially encompass and su... | 02/22/2005 |
| 6816042 | Process to make lightweight objects An “inside out” process is used to make RF antennas and components or higher frequency components and/or optics. An electroformed single or multi layer of metal, such as copper, is applied to a reusable or disposable mandrel. Additional metal or composite compon... | 11/09/2004 |
| 6702591 | Current mode data bus incorporating integrated coupler circuitry An interface assembly, which may be used with a current mode data bus, couples to an existing current mode data bus and includes a length of unshielded data bus disposed on a printed circuit board. A plurality of coupler magnetic assemblies are disposed o... | 03/09/2004 |
| 6559742 | Flexible waveguide with rounded corrugations A flexible waveguide has a flexible wall enclosing an elongated cylindrical passage for transmission of an electromagnetic wave along the passage. A succession of corrugations is disposed along an interior surface of the wall facing the passage. The corru... | 05/06/2003 |
| 6124770 | Expandable resin composition An expandable resin composition comprising (A) HDPE (high density polyethylene); (B) a high pressure, low density homopolymer of ethylene (HP-LDPE); (C) polypropylene; (D) a polysiloxane-polyether block copolymer; and (E) a nucleating agent of azodicarbonamide and/or ta... | 09/26/2000 |
| 6052044 | Ellipsoidal cross section radio frequency waveguide A waveguide for high power radio frequency transmission, comprising a tubular member having an ellipsoidal cross section and relatively uniform wall thickness having a ratio of major to minor axes between about 1.5 to 2.0 and a minimum minor axis of about... | 04/18/2000 |
| 6041219 | Integrated orthogonal mode transducer/filter design for microwave frequency-domain A printed circuit board (PCB) transceiver I/O filter design which provides both polarization and isolation filtering includes a receive probe positioned in a first orientation in an opening of the PCB which has a feed waveguide attached to it on a first s... | 03/21/2000 |
| 5889449 | Electromagnetic transmission line elements having a boundary between materials of high and low dielectric constants An electromagnetic wave propagation structure, suitable for the transmission of an electromagnetic wave and the formation of resonators within filters, is constructed of both high and low dielectric-constant materials wherein the high dielectric-constant ... | 03/30/1999 |
| 5852390 | Circularly polarized wave-linearly polarized wave transducer A circularly polarized wave-linearly polarized wave transducer using a waveguide characterized by expanding the inner wall of the section vertical to the tube axis of the waveguide in a taper form having a gradient in the axial direction of the tube. The ... | 12/22/1998 |
| 5783317 | Multilayer metal composite for microwave tubing and the like A multi-layer metal composite for microwave tubing and the like, which comprises a tubular shaped copper alloy base metal (e.g., brass or phosphorus bronze) lined with silver. A relatively thin interliner layer of a grain refiner containing copper alloy (... | 07/21/1998 |
| 5580387 | Corrugated waveguide for a microwave plasma applicator A corrugated waveguide is disclosed comprising a cylindrical body with outer and inner surfaces. The inner surface is provided with plurality of ridges uniformly spaced around the inner surface. Presence of 2n ridges secures the formation of microwaves wi... | 12/03/1996 |
| 5557530 | System for synthesizing microwave filters in a rectangular waveguide A system for synthesizing a microwave filter including a plurality of resonators having no tuning elements, in particular waveguide filters for use in satellite telecommunications networks. Signals representing the coupling coefficients of the coupling el... | 09/17/1996 |
| 5487875 | Microwave introducing device provided with an endless circular waveguide and plasma treating apparatus provided with said device A microwave introducing device has an endless circular waveguide provided with a plurality of slots. The circular waveguide is provided with a microwave introducing portion connected to a microwave power source, and the plurality of slots are spaced throu... | 01/30/1996 |
| 5364136 | Flanges and bodies for microwave waveguides components Joint formers for coupling between duct components having different cross-sections include a core having holes for fixing members and an opening provided with a hollowed out recess. In the opening there is formed at least one series of stepped spot-faced ... | 11/15/1994 |
| 5202650 | Matched spurious mode attenuator and transition for circular overmoded waveguide A mode suppressor structure designed to maintain TE01 mode matching in an overmoded waveguide, while at the same time allowing efficient coupling of unwanted modes for dissipation in the mode filtering structure of the overmoded waveguide, and ... | 04/13/1993 |
| 5148134 | Optimized design for TE01 mode circular waveguide connected to a bend section An optimized design for circular overmoded waveguide, of both the dielectric lined or sheathed helix types, operating in the microwave and lower millimeter wave bands.... | 09/15/1992 |
| 5046016 | Computer aided design for TE01 mode circular waveguide A computer aided design (CAD) method for designing circular overmoded waveguide systems having optimal operating characteristics. The CAD method receives selected input waveguide operational, material and structural parameters and computes the resulting w... | 09/03/1991 |
| 5023866 | Duplexer filter having harmonic rejection to control flyback A radio frequency duplexer filter for a duplex transceiver is disclosed. To prevent spurious signals conducted by flyback responses of the transmit bandpass filter 103 from reaching the antenna (105), a band reject circuit consisting of third harmonic qua... | 06/11/1991 |
| 4956620 | Waveguide mode converter and method using same A waveguide mode converter converts electromagnetic power being transmitted in a TE0n or a TM0n mode, where n is an integer, to an HE11 mode. The conversion process occurs in a single stage without requiring the power to p... | 09/11/1990 |
| 4918411 | Dielectric aperture assembly and method for fabricating the same A fabricated dielectric aperture assembly includes a first layer of electrically conductive material having an opening therethrough to define a first aperture, a second layer of electrically conductive material spaced from the first electrically conductiv... | 04/17/1990 |
| 4906951 | Birefringent corrugated waveguide A corrugated waveguide having a circular bore and noncircularly symmetric corrugations, and preferably elliptical corrugations, provides birefringence for rotation of polarization in the HE11 mode. The corrugated waveguide may be fabricated by ... | 03/06/1990 |
| 4825221 | Directly emitting dielectric transmission line Means are provided for radiating electromagnetic waves from a receiving end zone of a dielectric line for transmitting electromagnetic waves without the need for a metal horn antenna or a metal waveguide, and matching problems are thereby substantially av... | 04/25/1989 |
| 4800350 | Dielectric waveguide using powdered material 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 sub... | 01/24/1989 |
| 4710736 | Flexible waveguides with 45° corrugations to allow bending and twisting of waveguides A flexible waveguide (1) has corrugated seamless walls (2) the corrugations of which are inclined to the transverse planes of the waveguide, that is, planes perpendicular to the longitudinal axis of the waveguide, at an angle of substantially 45°. The in... | 12/01/1987 |
| 4680558 | Corrugated transition device for use between a continuous and a corrugated circular waveguide with signal in two different frequency bands A transition device achieves transformation of the signal carrier mode of a continuous wave guide, into the hybrid mode, the corresponding mode for carrying signals in corrugated structures, by employing a tapered waveguide transition of circular cross-se... | 07/14/1987 |
| 4665660 | Millimeter wavelength dielectric waveguide having increased power output and a method of making same A millimeter wavelength solid dielectric waveguide having either an undulng or roughened outer surface is disclosed. As configured, and properly designed, for the wavelength of interest, the non-cylindrical surface will not have any deleterious effects o... | 05/19/1987 |
| 4654962 | Method of fabricating doubly-truncated circular waveguide A waveguide having reduced windloading yet a relatively wide bandwidth for the dominant mode of propagation comprises an elongated cylinder having substantially parallel plates forming an interior waveguide portion which in cross-section is a doubly-trunc... | 04/07/1987 |
| 4525693 | Transmission line of unsintered PTFE having sintered high density portions A transmission line is provided, at least a portion of the wave energy transmitting part of the line being made of a dielectric material shaped to create a physical condition which preserves the deflected wave surface of the electromagnetic wave along the... | 06/25/1985 |
| 4503423 | Extensible and retractable barrier and electromagnetic intrusion detector therefor A continuous strip of coiled material is provided with protrusions, such as barbs, which are oriented to eliminate mutual interference when the coiled material is stacked in a compact, collapsed nested condition and wherein each turn of the coil is perman... | 03/05/1985 |
| 4441091 | Low loss leakage transmission line A low loss leakage transmission line including a cylindrical dielectric tube the wall thickness d2 of which is selected to satisfy ##EQU1## where &3xb5;1 is the dielectric constant of the internal space within the tube, &3xb5; | 04/03/1984 |
| 4429290 | Flexi-bend corrugated waveguide An unsymmetrically corrugated TE01 mode circular waveguide bend. Unsetrical corrugations approximately one-quarter wavelength deep are utilized to suppress energy transfer to other modes inherent in smooth wall circular guide bends. The corrug... | 01/31/1984 |
| 4323867 | Fragment-tolerant transmission line An improved transmission line or waveguide that can tolerate damage from ordnance fragments without severe degradation of performance. Ordnance fragment penetration into a waveguide tends to produce jagged inward protrusions or loose metal chips of the ty... | 04/06/1982 |
