Stacked Patents (Class 343/774)
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Patent number: 10680340Abstract: A cone-based multi-layer wide band antenna is provided, including a cone-based member having a multi-layer structure. The multi-layer structure includes a first layer conical structure, and the first layer conical structure has a height and a base radius configured to provide a desired impedance of the antenna.Type: GrantFiled: May 18, 2018Date of Patent: June 9, 2020Assignee: INTELLIGENT FUSION TECHNOLOGY, INC.Inventors: Xingping Lin, Zhonghai Wang, Genshe Chen, Erik Blasch, Khanh Pham
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Patent number: 9368858Abstract: An L-shape Corner (LC) Antenna uses an L shaped antenna on the corner of a circuit board of a wireless device. A low band element is positioned and designed to resonate along the long dimension of the adjacent ground plane while a high band element is positioned and designed to resonate along the short dimension of the adjacent ground plane. The single antenna element provides two separate radiating sections that allow for optimization of low and high band resonances that are often required to service the cellular and other wireless frequency bands. The two radiating sections of the antenna provide different polarizations for the two resonances that assist in de-coupling the two resonances from each other.Type: GrantFiled: January 12, 2015Date of Patent: June 14, 2016Assignee: ETHERTRONICS, INC.Inventor: Weichun Lin
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Publication number: 20140203984Abstract: The present invention relates to a series fed collinear antenna which includes cone-shaped radiating elements energized via a series fed common transmission line. Phasing stubs are provided between selected radiating elements and are oriented such that the phasing stub improves gain and reliability by affecting the signal to produce a beneficial elevational coordinate signal pattern. A ground plane may be provided proximate the lower end of the antenna structure to further enhance the radiated signal. The ground plane may be formed in the shape of a dome having an apex vertically disposed above a rim.Type: ApplicationFiled: January 24, 2014Publication date: July 24, 2014Applicant: Consolidated Radio, Inc.Inventor: Jack Nilsson
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Patent number: 8749434Abstract: A dielectric resonator antenna is disclosed that includes a multi-layer substrate on which a plurality of insulating layers and conductor layers are alternately stacked. The dielectric resonator antenna also includes a first conductor plate that has an opening part on the upper portion of the top insulating layer of the multi-layer substrate and a second conductor plate that is formed on the lower portion of the bottom insulating layer from the first conductor plate. The insulating layer is formed with at least two stacked layers and is disposed at a position corresponding to the opening part. The dielectric resonator antenna also includes a plurality of first metal via holes, a feeding part and a matching substrate that is stacked on the opening part and is stacked with at least one insulating layer.Type: GrantFiled: July 22, 2010Date of Patent: June 10, 2014Assignees: Samsung Electro-Mechanics Co., Ltd., Korea University Research and Business FoundationInventors: Myeong Woo Han, Jung Aun Lee, Chul Gyun Park, Seung Ho Choi, Moonil Kim, Kook Joo Lee
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Patent number: 8729440Abstract: A radio frequency heater is disclosed including a vessel for containing material to be heated and a radio frequency radiating surface. The vessel has a wall defining a reservoir. The radio frequency radiating surface at least partially surrounds the reservoir. The radiating surface includes two or more circumferentially spaced petals that are electrically isolated from other petals. The petals are positioned to irradiate at least a portion of the reservoir, and are adapted for connection to a source of radio frequency alternating current. A generally conical tank or tank segment having a conically wound radio frequency applicator is also contemplated. Also, a method of heating an oil-water process stream is disclosed. In this method a radio frequency heater and an oil-water process stream are provided. The process stream is irradiated with the heater, thus heating the water phase of the process stream.Type: GrantFiled: March 2, 2009Date of Patent: May 20, 2014Assignee: Harris CorporationInventor: Francis Eugene Parsche
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Patent number: 8604991Abstract: An antenna array provided with two frames which form waveguides. Each frame includes a plate portion and frame portion. The plate portion includes grooves laid out next to one another. Each groove has an open end and a closed end. The frame portion is arranged adjacent to the plate portion. The frame portion has an opening that opens in a direction perpendicular to a direction in which the grooves extend and a direction in which the grooves are laid out. A dielectric substrate is held between the two frames. The dielectric substrate includes an array of feeders and electronic circuits, each circuit having a discrete active element. The circuits are exposed from the opening of either one of the frames. The frames are superimposed with the dielectric substrate so that the grooves form the waveguides. Each circuit is electromagnetically connected to a corresponding one of the waveguides.Type: GrantFiled: July 2, 2009Date of Patent: December 10, 2013Assignee: Inter-University Research Institute National Institutes of Natural SciencesInventor: Yoshio Nagayama
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Patent number: 8537066Abstract: The antenna assembly includes first and second adjacent antenna elements each having a tapered or conical antenna body with a base and an apex opposite the base. An elongated or cylindrical antenna body extends from the base of the conical antenna body, and includes a plurality of adjacent elongated or cylindrical antenna body portions, and a respective dielectric member separating adjacent cylindrical antenna body portions. Each of the first and second adjacent antenna elements are aligned along a common longitudinal axis with respective apexes in opposing relation to define a dipole antenna. Increased radiation pattern bandwidth and satisfactory pattern on the horizon may be achieved in such a biconical-type antenna.Type: GrantFiled: August 25, 2011Date of Patent: September 17, 2013Assignee: Harris CorporationInventors: Russell W. Libonati, Larry Goldstein, Francis Eugene Parsche
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Patent number: 8487824Abstract: A vertically polarized dipole or bicone antenna is positioned cylindrically with in many cylindrical layers of polarizing grids that slowly rotate the incident field to cross 0 degrees, i.e., 90 degrees to the horizon, and to attenuate or minimize the effects of gain nulls from reflections off of the innermost grid layer. Such an antenna is used for detecting both horizontal and vertical polarized signals over a broad bandwidth whereby the response to both polarizations is equal.Type: GrantFiled: September 13, 2010Date of Patent: July 16, 2013Assignee: The United States of America as Represented by the Secretary of the NavyInventor: Michael J. Josypenko
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Patent number: 8098207Abstract: An aperture of an antenna for a radar system comprises a first waveguide comprising a first protrusion and a second protrusion, each protrusion extending longitudinally along one side of the first waveguide. The aperture further comprises a second waveguide comprising a third protrusion and a fourth protrusion, each protrusion extending longitudinally along one side of the second waveguide. The first and third protrusions and second and fourth protrusions adjoin to form a radio frequency choke at least partially suppressing cross polarization of radio frequencies between the first and second waveguides.Type: GrantFiled: September 16, 2008Date of Patent: January 17, 2012Assignee: Rockwell Collins, Inc.Inventors: Brian J. Herting, James B. West, Wajih A. ElSallal, John C. Mather, Bret W. Spars, Daniel L. Woodell
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Patent number: 7973731Abstract: The conical monopole antenna includes a conical antenna element having an apex and a base, a conductive base member coupled across the base of the conical antenna element and a ground plane antenna element, e.g. a disc antenna element, adjacent the apex of the conical antenna element. A fold conductor is coupled between the conductive base member and the ground plane antenna element. The fold conductor may include at least one impedance element, such as a resistive element or inductive element. An antenna feed structure is coupled to the ground plane and conical antenna elements. The antenna may have reduced gain above a cutoff frequency being traded for low VSWR below the cutoff frequency to get increased usable bandwidth. The folded resistive termination is preferential to driving point attenuation and edge loading, and the conical monopole antenna provides low VSWR at most radio frequencies.Type: GrantFiled: May 23, 2008Date of Patent: July 5, 2011Assignee: Harris CorporationInventor: Francis Eugene Parsche
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Patent number: 7940207Abstract: A modular system is for assembling a fill-level radar antenna, a fill-level radar antenna, and o a fill level radar. The modular system comprises several modules that can be interconnected. In this way a host of different fill-level radar antennae may be produced that are optimally adapted to the corresponding conditions.Type: GrantFiled: August 26, 2009Date of Patent: May 10, 2011Assignee: Vega Grieshaber KGInventors: Klaus Kienzle, Josef Fehrenbach, Juergen Motzer, Johannes Falk, Fritz Lenk
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Patent number: 7864128Abstract: A method and apparatus for stacked waveguide horns using dual polarity feeds oriented in quadrature have been disclosed.Type: GrantFiled: August 4, 2008Date of Patent: January 4, 2011Inventor: Michael B. Staal
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Patent number: 7724176Abstract: According to one embodiment, an antenna array includes a plurality of racks that are each configured with a plurality of antenna elements. Each rack may be rotated relative to the other racks through an axis that is generally parallel to the axis of other racks. Each antenna element within each rack has an axial orientation that is generally similar to and has an elevational orientation that is individually adjustable relative to one another.Type: GrantFiled: March 13, 2009Date of Patent: May 25, 2010Assignee: Raytheon CompanyInventors: James A. Pruett, Timothy E. Adams, Christopher T. Moshenrose, Jerry M. Grimm
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Patent number: 7423603Abstract: A method and apparatus for stacked waveguide horns using dual polarity feeds oriented in quadrature have been disclosed.Type: GrantFiled: May 29, 2007Date of Patent: September 9, 2008Inventor: Michael B. Staal
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Patent number: 7408521Abstract: An antenna that includes, in at least one embodiment, first and second radiating elements each having a substantially conical radiating surface. Each radiating surface may be substantially linearly conical or nonlinearly conical. The radiating surfaces are substantially aligned coaxially, and the radiating elements are positioned on opposing sides of a signal launching region, extending in opposing directions from the signal launching region. A signal feed extends through the first radiating element, thereby positioning a signal launch point between the first and second radiating elements in the signal launching region proximate vertices of the first and second radiating surfaces. The first and second radiating elements have first and second included angles, respectively, that are each no less than about 40 degrees.Type: GrantFiled: April 12, 2006Date of Patent: August 5, 2008Assignee: Innerwireless, Inc.Inventors: James Lesley Smith, Nicholas Savino
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Patent number: 7239284Abstract: A method and apparatus for stacked waveguide horns using dual polarity feeds oriented in quadrature have been disclosed.Type: GrantFiled: October 28, 2004Date of Patent: July 3, 2007Inventor: Michael B. Staal
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Patent number: 7190318Abstract: An apparatus includes a discone antenna including a cone-shaped element whose physical shape is at least partially defined by at least one pleat.Type: GrantFiled: March 29, 2004Date of Patent: March 13, 2007Inventor: Nathan Cohen
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Patent number: 7170461Abstract: The dipole antenna includes a first antenna element assembly and a second antenna element assembly arranged in a dipole antenna configuration. The first antenna element assembly has one or more conical antenna elements, and the second antenna element assembly has a series of conical antenna elements with each successive conical antenna element at least partially within a prior conical antenna element. Each of the first and second antenna dipole assemblies may also include a respective disk antenna element and a filament antenna element. The antenna has a stable beamwidth and broad bandwidth over a range of frequencies.Type: GrantFiled: May 4, 2005Date of Patent: January 30, 2007Assignee: Harris CorporationInventor: Francis Eugene Parsche
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Patent number: 7167137Abstract: A collapsible discone antenna is provided with an ultra wide band width by providing a collapsible conical skeleton cone, with the rods of the skeleton being provided with meander lines so as to effectively reduce the overall dimensions of the antenna by a factor of 2, with the antenna rods being electrically interconnected at their distal ends so as to eliminate performance degradation due to varying ground conductivities. A specialized feed configuration is used in one embodiment to feed multiple antennas stacked above a low band disc through the utilization of one or more coaxial lines which are wrapped around a ferrite toroid so that they may be passed up through the low-band disc without detuning the low band discone antenna. The use of the toroid inductor between the low-band cone and the low-band disc further reduces the low frequency cutoff of the antenna by markedly decreasing the VSWR at frequencies as low as 20 megahertz.Type: GrantFiled: February 25, 2005Date of Patent: January 23, 2007Assignee: BAE Systems Information and Electronic Systems Integration Inc.Inventor: John T. Apostolos
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Patent number: 7142166Abstract: A biconical antenna; an entry conic having an entry base opposite an entry vertex and a termination conic having a termination base opposite a termination vertex. The entry and termination conics share substantially the same axis and the entry vertex is adjacent the termination vertex. The transmission line is received by the entry conic and terminated in the termination conic. Together, the entry conic and the termination conic phase correct energy emanating from the transmission line. Another embodiment of the antenna comprises an entry conic having at least two sub-conics and a termination conic having at least two sub-conics. Each of the sub-conics having an integer multiple of a half-angle. The biconical antenna may also include a multi-conductor transmission line, wherein the biconical antennas are arranged in a co-linear relationship. Each of the multi-conductors is coupled to at least one of the plurality of biconical antennas.Type: GrantFiled: October 10, 2003Date of Patent: November 28, 2006Assignee: Shakespeare Company, LLCInventor: Gary A Martek
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Patent number: 7095379Abstract: An electrical component and a method of constructing it are disclosed. The component includes a hollow tubular structure. The structure includes a series of axially spaced apart rings and at least one outer perimeter housing member. The housing member interconnects the rings for defining an internal configuration of the hollow tubular structure for electrical purposes. The rings and the housing member each include inter-engageable elements for helping secure mechanically the rings and housing member together to facilitate final assembly of the electrical component.Type: GrantFiled: June 6, 2002Date of Patent: August 22, 2006Assignee: ATK Alliant Techsystems, Inc.Inventors: Mark K. Pryor, John E. Marks, Patrick N. Bonebright, Kenneth Neal Segal, Alan Kogut
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Patent number: 6980168Abstract: An antenna comprises an antenna feed line having first and second conductors. It also comprises an antenna driver section having a pair of opposing cones. Each of the cones has an apex region and the cones are arranged so that the apex regions are spaced apart and are adjacent. One of the cones is connected to the first conductor and a second of the cones is connected to the second conductor. The antenna also comprises an antenna beam shaper section. This section has a beam shaper element with a beam shaping surface chosen to provide selected antenna operating characteristics and also has a conforming surface that is in substantial conformity with a crotch defined between the two cones.Type: GrantFiled: November 25, 2003Date of Patent: December 27, 2005Assignee: The United States of America as represented by the Secretary of the NavyInventor: Jovan E. Lebaric
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Patent number: 6967626Abstract: A collapsible discone antenna is provided with an ultra wide band width by providing a collapsible conical skeleton cone, with the rods of the skeleton being provided with meander lines so as to effectively reduce the overall dimensions of the antenna by a factor of 2, with the antenna rods being electrically interconnected at their distal ends so as to eliminate performance degradation due to varying ground conductivities. A specialized feed configuration is used in one embodiment to feed multiple antennas stacked above a low band disc through the utilization of one or more coaxial lines which are wrapped around a ferrite toroid so that they may be passed up through the low-band disc without detuning the low band discone antenna. The use of the toroid inductor between the low-band cone and the low-band disc further reduces the low frequency cutoff of the antenna by markedly decreasing the VSWR at frequencies as low as 20 megahertz.Type: GrantFiled: September 9, 2003Date of Patent: November 22, 2005Assignee: BAE Systems Information and Electronic Systems Integration Inc.Inventor: John T. Apostolos
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Patent number: 6943747Abstract: A biconical antenna for wireless communications includes a conical upper conductive body and a conical lower conductive body having a common apex, which is used as a power feed point, wherein a space between the conical upper and lower conductive bodies is filled with a dielectric material such that a shortest distance connecting the conical upper and lower conductive bodies along a surface of the dielectric material is a curve at which an incident angle of an incident wave incident on the surface of the dielectric material through the dielectric material from the common apex is a Brewster angle over the entire surface of the dielectric material.Type: GrantFiled: September 2, 2003Date of Patent: September 13, 2005Assignee: Samsung Electronics Co., Ltd.Inventor: Do-Hoon Kwon
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Publication number: 20040041736Abstract: A biconical antenna for wireless communications includes a conical upper conductive body and a conical lower conductive body having a common apex, which is used as a power feed point, wherein a space between the conical upper and lower conductive bodies is filled with a dielectric material such that a shortest distance connecting the conical upper and lower conductive bodies along a surface of the dielectric material is a curve at which an incident angle of an incident wave incident on the surface of the dielectric material through the dielectric material from the common apex is a Brewster angle over the entire surface of the dielectric material.Type: ApplicationFiled: September 2, 2003Publication date: March 4, 2004Inventor: Do-Hoon Kwon
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Patent number: 6667721Abstract: A broad band antenna uses a bicone antenna configuration as a feed transformer and exponentially tapered reflector fins to radiate the antenna's energy. The bicone antenna design is used to match the antenna's impedance to coaxial cable impedance. The fins function to reduce the traditional bicone antenna diameter. Reflection between the cones and the attached reflector fins as well as return loss are reduced by wrapping the reflector fins with metallic foil.Type: GrantFiled: October 9, 2002Date of Patent: December 23, 2003Assignee: The United States of America as represented by the Secretary of the NavyInventor: Hale Bradford Simonds
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Patent number: 6608598Abstract: An improved tuning method is used in conjunction with a set of nested electrically conducting cones to increase the frequency band over which the resulting radiating system functions as an electrically small antenna with controlled variation in input impedance. This technique enables switching of the frequency band by means of simple circuits that can be activated by a control voltage.Type: GrantFiled: January 7, 2002Date of Patent: August 19, 2003Inventors: Walter Gee, Paul E. Mayes
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Patent number: 6593892Abstract: The present invention comprises a substantially omnidirectional antenna with minimal gain variation over the 360 degree azimuth. A plurality of biconical antenna elements are stacked, wherein a feed line passes through the center of the biconical antenna elements. The feed line is designed to provide the proper quantity of power to each biconical antenna element without the use of a power divider. Each biconical antenna element is formed by two truncated flared apart reflecting surfaces. Each biconical antenna element is attached to a nonconductive collar above and below.Type: GrantFiled: July 3, 2001Date of Patent: July 15, 2003Assignee: Tyco Electronics Logistics AGInventors: Royden M. Honda, Court E. Rossman
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Publication number: 20030085845Abstract: The present invention comprises a substantially omnidirectional antenna with minimal gain variation over the 360 degree azimuth. A plurality of biconical antenna elements are stacked, wherein a feed line passes through the center of the biconical antenna elements. The feed line is designed to provide the proper quantity of power to each biconical antenna element without the use of a power divider. Each biconical antenna element is formed by two truncated flared apart reflecting surfaces. Each biconical antenna element is attached to a nonconductive collar above and below.Type: ApplicationFiled: July 3, 2001Publication date: May 8, 2003Inventors: Royden M. Honda, Court E. Rossman
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Patent number: 6337664Abstract: An improved tuning method is used in conjunction with a set of nested electrically conducting cones to increase the frequency band over which the resulting radiating system functions as an electrically small antenna with controlled variation in input impedance. This technique enables switching of the frequency band by means of simple circuits that can be activated by a control voltage.Type: GrantFiled: October 21, 1998Date of Patent: January 8, 2002Inventors: Paul E. Mayes, Walter Gee
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Patent number: 6335707Abstract: To make optimum use of an available volume exhibiting in particular surfaces of small radius of curvature, with a view to housing electronic circuits therein, a stack (11) of layers of possibly different compositions (circuits, components, insulants, etc.) is made, these layers being parallel to the surface of largest dimension of this volume.Type: GrantFiled: September 27, 2000Date of Patent: January 1, 2002Assignee: Thomson-CSFInventors: Yves Canal, Corinne Liguoro, Emile Pouderous
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Patent number: 6198456Abstract: The present invention relates to a transmission or reception device. The device comprises several layers having openings such that the stack thereof produces one or more antennas. Microwave circuits are implanted on internal layers.Type: GrantFiled: February 16, 1999Date of Patent: March 6, 2001Assignee: Thomson-CSFInventors: Corinne Le Halle, Yves Canal, Emile Pouderous
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Patent number: 6163307Abstract: A multilayered helical antenna for mobile communication units includes a first dielectric sheet, a plurality of second dielectric sheets, a plurality of second and third dielectric sheets. All of the second dielectric sheets, except one, have a starting hole and an ending hole, with the exception having the starting hole only. Each of the second dielectric sheet is provided with a partially opened circular metallic pattern. Each of the third dielectric sheets has a via hole. Each of the dielectric sheets has a through-hole at a center thereof in order to allow a whip antenna to be slid upward and downward along a center axis of a helical antenna which is formed by stacking the dielectric sheets in a predetermined order.Type: GrantFiled: September 22, 1999Date of Patent: December 19, 2000Assignee: Korea Electronics Technology InstituteInventors: Jong Kyu Kim, In Shig Park, Ho Seok Seo
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Patent number: 5767814Abstract: A direction finding antenna system includes a plurality of monopole elements disposed symmetrically around a center of a circular ground plane at the same radial distance from the center and a multimode combiner connected to the monopole elements to provide one or more mode outputs. A phase difference detector determines phase differences between selected ones of the mode outputs to provide azimuth bearing of a detected object. Typically, four or eight monopole elements are used. Placement of the inherently narrowband monopole elements in a bicone structure having a polarizer grid extends the useful bandwidth. Multiband coverage is achieved with a plurality of such antennas connected by a feed cable positioned on the polarizer grid to avoid interference.Type: GrantFiled: August 16, 1995Date of Patent: June 16, 1998Assignee: Litton Systems Inc.Inventors: Peter J. Conroy, Nathan D. Curry, Derek R. Warner
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Patent number: 5534880Abstract: An omnidirectional antenna with minimal gain variation over the 360.degree. azimuth. A plurality of biconical antennas are stacked vertically. A radome covering the antenna and cylindrically encasing the antenna supports the stack of biconical antennas. A bundle of transmission lines is helically wound about the cylindrical periphery of the biconical antennas, preferably at an angle between 37.degree. and 41.degree.. Each biconical antenna is formed by two truncated flared apart reflecting surfaces that are connected by a nonconductive spacing collar between their truncated portions.Type: GrantFiled: March 28, 1995Date of Patent: July 9, 1996Assignee: Gabriel Electronics IncorporatedInventors: Donald D. Button, William D. Wyatt, James F. McGrath
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Patent number: 5495262Abstract: A microwave radar antenna that substantially comprises molded or extruded thermoplastic components that are assembled into completed assemblies, are then metallized by either electroless copper or are electroplated with copper to achieve RF conductivity. The finished subassemblies are joined together forming the completed antenna. The molded, metallized, plastic antenna uses a thermoplastic material, such as polyetherimide, or suitable high strength, high temperature thermoplastic that is used to injection mold or extrude detailed microwave components. The molded components are assembled, using epoxy adhesives, solvents or other mechanical method into microwave subassemblies. These subassemblies are then either electroless copper plated or electroplated to provide RF conductivity. The metallized subassemblies are then joined together using mechanical methods to form a completed radar antenna, replacing heavier more costly metal radar antennas.Type: GrantFiled: December 9, 1994Date of Patent: February 27, 1996Assignee: Hughes Aircraft CompanyInventor: Douglas O. Klebe
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Patent number: 5404148Abstract: An antenna having antenna modules for an extremely wideband active monopulse phased array system, the modules including a housing provided with four radiators of the rectangular open-ended waveguide type and with an electric circuit. With the antenna modules being suitably stacked, the radiators constitute a substantially continuous antenna surface, the radiators being positioned at the points of intersection of a system of equilateral triangles which make up the antenna surface. After preamplification, phase shift and down-conversion to an intermediate frequency, received signals from a large number of antenna modules are combined to yield a sum beam, an azimuth difference beam and an elevation difference beam.Type: GrantFiled: November 24, 1992Date of Patent: April 4, 1995Assignee: Hollandse Signaalapparaten B.V.Inventor: Johan M. C. Zwarts
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Patent number: 5019832Abstract: A plurality of conical transmission lines are concentrically nested to form n output antenna for pulsed-power, radio-frequency, and microwave sources. The diverging conical conductors enable a high power input density across a bulk dielectric to be reduced below a breakdown power density at the antenna interface with the transmitting medium. The plurality of cones maintain a spacing between conductors which minimizes the generation of high order modes between the conductors. Further, the power input feeds are isolated at the input while enabling the output electromagnetic waves to add at the transmission interface. Thus, very large power signals from a pulse rf, or microwave source can be radiated.Type: GrantFiled: October 18, 1989Date of Patent: May 28, 1991Assignee: The United States of America as represented by the Department of EnergyInventor: Carl A. Ekdahl
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Patent number: 4477812Abstract: Microprocessor controlled electronically scanned collinear array receiver stem includes a dipole antenna mounted atop the array to provide complete scan coverage from horizon to horizon. The microprocessor controls the scan angle and the frequency range to provide full search coverage for all scan angles in a hemisphere. Simultaneous angle tracking and frequency tracking are accomplished when the desired signal is acquired.Type: GrantFiled: May 29, 1981Date of Patent: October 16, 1984Assignee: The United States of America as represented by the Secretary of the NavyInventors: Belmont Frisbee, Jr., Charles E. Swedblom
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Patent number: 4225869Abstract: A compact multi-cone antenna is disclosed wherein quarter wavelength cones re utilized at each slot of a slotted ring antenna. The cones are selected to be quarter wavelength in order to provide an impedance transformation for better impedance matching with free space. The individual cones are chosen to have different characteristic impedances in order to provide the antenna with a sharp disc-like radiation pattern.Type: GrantFiled: March 26, 1979Date of Patent: September 30, 1980Assignee: The United States of America as represented by the Secretary of the ArmyInventor: Dieter R. Lohrmann
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Patent number: 4181910Abstract: A hand-carried and self-contained receiver and indicator for producing a signal when the presence of pulsed (or pulsed doppler) radar operation is detected, either in a broad band containing all the common radar pulse frequencies, or in a limited band whereby those outside the band are rejected. A simple biconical horn antenna is provided at one end of a very short coaxial line leading to a broadband detector. From the detector, a flexible transmission line connects to the remaining receiver circuitry containing, in one mode of operation, an amplifier, a limiter, a retriggerable multivibrator and an audible beep type of tone generator driving an earphone. In another mode of operation, the retriggerable multivibrator is replaced by a dual tuned circuit having a substantially restricted bandwidth for passing only a desired pulse frequency signal.Type: GrantFiled: December 14, 1977Date of Patent: January 1, 1980Assignee: Northrop CorporationInventor: Allan B. Hitterdal
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Patent number: 3978797Abstract: A radiometer is mounted in a guided missile for detecting electro-magnetic hermal power in the microwave region of the spectrum radiated from an area of suspected targets with circuitry coupled thereto to respond to a predetermined change in level of radiation to generate a warhead fuzing signal.Type: GrantFiled: April 28, 1971Date of Patent: September 7, 1976Assignee: The United States of America as represented by the Secretary of the NavyInventors: William W. Harrington, Frederick C. Alpers