Patents Examined by Eli Lieberman
  • Lightweight folding parabolic reflector and antenna system
    Patent number: 4527166
    Abstract: A portable lightweight folding parabolic reflector antenna for reception of microwave signals includes an axial waveguide tube which constitutes the main structural supporting member of the antenna, a ten- to fifteen-foot diameter dish mounted to the waveguide and a sub-reflector supported at the forward end of the waveguide. A low noise amplifier may be mounted to the rear end of the waveguide for amplification of the received signals. The folding dish includes a single sheet of resiliently elastic reflecting mesh supported by a radial framework of normally straight resiliently flexible spokes of tapering cross section. The spokes are pivotable by a lever system between a folded axial position and a deployed radial position.
    Type: Grant
    Filed: July 2, 1981
    Date of Patent: July 2, 1985
    Inventor: Robert A. Luly
  • Parabolic reflector formed of connectable half-sections
    Patent number: 4527167
    Abstract: A sectional parabolic reflector of improved construction comprising two similar parabolically curved half-reflector sections each having a longitudinal parabolic axis and a reflecting surface, a mount for said half-reflector sections, said mount and said half-reflector sections being separately formed, said mount and said half-reflector sections being formed for manual manipulation together at joints, said mount and half-reflector sections when manipulated together at said joints locking against movement of the half-reflector sections towards each other when they assume an operational position wherein their reflecting surfaces combine in a common parabolic surface, locking means extending between each of said half-reflector sections at a location spaced from said joints and for locking said joints to maintain said half-reflector sections with their reflecting surfaces in said operational position.
    Type: Grant
    Filed: March 22, 1983
    Date of Patent: July 2, 1985
    Assignee: Lindsay Specialty Products Limited
    Inventor: Milorad Miladinovic
  • Moisture seal in power operated vehicle antenna
    Patent number: 4527168
    Abstract: A seal for preventing intrusion of moisture between a lowermost or first movable tube section of a power operated antenna mast and an insulator between the first tube section and the panel through which the mast projects, the seal including a substantially inelastic polymeric insulator mounted on the panel with a bore therethrough surrounding the first tube section, an inside surface on the insulator perpendicular to the bore intersecting the latter at a lip extending through 360.degree. around the first tube section, and a substantially inelastic polymeric sleeve on and movable with the first tube section having an annular frustoconical seal shoulder engageable on the lip in an extended position of the first tube section to define a moisture seal between the latter and the insulator.
    Type: Grant
    Filed: August 8, 1983
    Date of Patent: July 2, 1985
    Assignee: General Motors Corporation
    Inventor: Ralph W. Edwards
  • Integrated spiral antenna and printed circuit balun
    Patent number: 4525720
    Abstract: A unidirection circularly polarized dual armed spiral antenna of a stripl printed circuit configuration is disclosed. The antenna is powered by a planar, edge connected, balun. The radial arms may be configured to spiral in any one of a multiplicity of different patterns and are not limited solely to Archimedean or logarithmic spirals.
    Type: Grant
    Filed: October 15, 1982
    Date of Patent: June 25, 1985
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Robert G. Corzine, Joseph A. Mosko
  • Dual-band antenna system of a beam waveguide type
    Patent number: 4525719
    Abstract: In a dual-band antenna of the beam wave-guide type, first and second electromagnetic waves from first and second feed horns, respectively, are directly provided to a frequency selective reflector along different axes, with both electromagnetic waves being provided from the frequency selective reflector along the same axis. The two electromagnetic waves are then reflected in common by first and second concave mirrors and then provided substantially along an axis coincident with the azimuth axis to the remainder of the beam wave-guide section which is itself rotatable about the azimuth axis.
    Type: Grant
    Filed: July 7, 1983
    Date of Patent: June 25, 1985
    Assignee: NEC Corporation
    Inventors: Ikuro Sato, Ryuichi Iwata
  • Antenna with coaxial connector
    Patent number: 4525718
    Abstract: An antenna defines a coaxial connector receptacle when the antenna is in a fully retracted position.
    Type: Grant
    Filed: March 3, 1983
    Date of Patent: June 25, 1985
    Assignee: General Research of Electronics, Inc.
    Inventors: Kazuyoshi Imazeki, Nobuaki Yokoyama
  • Antenna with BNC-type coaxial connector
    Patent number: 4523197
    Abstract: An antenna comprises an antenna body telescopically movable between a fully retracted position and a fully extended position and having a free end. A BNC-type coaxial receptacle is mounted to the free end of the antenna body. A mounting base receives the BNC-type coaxial receptacle when the antenna is in the fully retracted and completes an electrical ground circuit to the BNC-type receptacle.
    Type: Grant
    Filed: March 3, 1983
    Date of Patent: June 11, 1985
    Assignee: General Research of Electronics, Inc.
    Inventors: Kazuyoshi Imazeki, Nobuaki Yokoyama
  • Radio frequency lens antenna
    Patent number: 4523198
    Abstract: Multiple beam antennas are modified and improved through the use of lenses coupled together by hybrid junctions. A dual lens structure avoids circulators while permitting the lenses to be used both for transmission and for reception. A six lens structure provides perfect phase focusing utilizing an R-2R geometry with a Mobius topology, giving 360 degrees of independent antenna beams from a single circular or cylindrical antenna array.
    Type: Grant
    Filed: July 7, 1983
    Date of Patent: June 11, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Roger E. Clapp
  • Offset microwave feed horn for producing focused beam having reduced sidelobe radiation
    Patent number: 4521783
    Abstract: A short-focus microwave reflector is located a short distance away from the feed horn and is positioned to reflect the beam of microwave radiation away from the feed axis and toward a large primary reflector antenna for transmission. A conical shield extends from the feed horn to the secondary reflector, joining them together as a unit and preventing sidelobe radiation. The beam of radiation emerges from the shield through an aperture in the sidewall thereof. The short focus of the secondary reflector causes the beam to be focussed approximately at the plane of the aperture, such that the beam diameter is small and the aperture can also be small, reducing stray radiation from the shield structure. Diffraction at the edges of the aperture is reduced by a radially surrounding choke structure which further suppresses sidelobe radiation.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: June 4, 1985
    Assignee: Ford Aerospace & Communications Corporation
    Inventors: Lawrence G. Bryans, Kenneth R. Goudey, William F. Nickerson
  • Target seeker used in a pointer and tracking assembly
    Patent number: 4521782
    Abstract: An improved target seeker used in a pointer and tracking assembly for searching a large area in an X-Y plane, commonly called a field of regard. The improved seeker can search the field of regard using sweeps, spirals, circles and other types of scan patterns without blind spot restrictions.
    Type: Grant
    Filed: May 5, 1983
    Date of Patent: June 4, 1985
    Assignee: The Boeing Company
    Inventor: George T. Pinson
  • Phase scanned microstrip array antenna
    Patent number: 4521781
    Abstract: A microstrip array antenna, including spaced radiator elements supplied w microwave power and separated from an underlying ground reference plane by a layer of dielectric material, in which the antenna beam is phase scanned by periodically closing switching devices connected between the reference plane and at least one null point of each radiator element. In one embodiment, the radiator elements are identical rectangular patches disposed along a path, each patch having a length parallel to the path of one-half wavelength and a width transverse to the path not exceeding one wavelength in the underlying dielectric material at the antenna operating frequency. The patches are connected in series to receive microwave power by conductive strip elements whose widths are selected to effect a desired distribution of radiated microwave power from the patches.
    Type: Grant
    Filed: April 12, 1983
    Date of Patent: June 4, 1985
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Morris Campi, Arthur R. Sindoris
  • Multifrequency antenna matching apparatus with antomatic tuning
    Patent number: 4521913
    Abstract: An antenna matching apparatus tunable to different frequencies is disclosed for use with a high frequency transmitter that is rapidly switchable between different transmitting frequencies by a control unit according to a predetermined frequency scheme. This apparatus which is tunable as quickly as the transmitter, includes two or more antenna tuning means tuned to different frequencies which are tuned to different frequencies and switched rapidly by the control unit.
    Type: Grant
    Filed: July 9, 1982
    Date of Patent: June 4, 1985
    Assignee: Rohde & Schwarz GmbH & Co., KG
    Inventors: Franz R. Huber, Axel Stark
  • Omnidirectional vertical antenna with improved high-angle coverage
    Patent number: 4520363
    Abstract: An antenna structure includes a radiator element secured at one end to a ground plane. Two conducting plates separated by an axial spacer are secured to the opposite end of the radiator element.
    Type: Grant
    Filed: March 16, 1983
    Date of Patent: May 28, 1985
    Assignee: General Instrument Corporation
    Inventors: Melvin H. Wachspress, Walter Abramowitz
  • Attachment method-ceramic radome to metal body
    Patent number: 4520364
    Abstract: A radome assembly for an airframe and a method for attaching the assembly to an airframe are provided. The radome assembly comprises a ceramic shell with a polymeric transition section bonded thereto, which shell is adapted for mounting to a metal airframe. The transition section has a coefficient of thermal expansion intermediate between that of the ceramic shell and that of the metal airframe.The method of this invention comprises preloading the transition section in circumferential compression when the radome assembly is attached to the airframe.
    Type: Grant
    Filed: April 19, 1983
    Date of Patent: May 28, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: John S. Perry
  • Telescoping antenna with actuating gear driven cable
    Patent number: 4520365
    Abstract: A telescoping antenna with remote control which is extended and retracted by means of a plastic wire (9) running inside the telescope is described. The wire (9) comprises cut-in slots (12) which are spaced at regular intervals all the way through and whose front surfaces (14a, 14b) are closest in the area of the neutral fiber of the wire (9). The teeth (16) of a driven toothed gear (10) mesh with the slots (12) and act practically only in the area of the neutral fiber on the wire (9) which as a result has a lesser inclination to break.
    Type: Grant
    Filed: December 29, 1982
    Date of Patent: May 28, 1985
    Assignee: Wilhelm Sihn Jr. KG.
    Inventor: Richard Langheck
  • Adaptive spatial microwave filter for multipolarized antennas and the process of its application
    Patent number: 4518966
    Abstract: The invention relates to an adaptive spatial microwave filter for multipolarized antennas and the process of its application. According to the invention, the filter principally consists of two conjugated networks of lines L.sub.1, l.sub.1 ; L.sub.2, l.sub.2 ; . . . of sections of wires loaded with diodes D mounted in series and essentially symmetrically superposed. The lines are passed through by polarizing currents I.sub.1, I.sub.2 . . . which according to selected distribution enables attenuation at reception of certain secondary lobes of the antenna pattern. The invention applies in particular to the localization and neutralization of jammers.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: May 21, 1985
    Assignee: Societe d'Etude du Radant
    Inventor: Henri Sadones
  • Vertically polarized omnidirectional antenna
    Patent number: 4518969
    Abstract: An antenna for providing a vertically polarized omnidirectional horizontal radiation pattern comprising colinear dipoles. Suitable feeding arrangements are provided for electromagnetically feeding the dipoles with a signal. An axially extending conductive member is spaced on either side of the colinear dipoles. The axis of each of said conductive members as well as the axis of the dipoles are colinear and parallel.
    Type: Grant
    Filed: December 22, 1982
    Date of Patent: May 21, 1985
    Assignee: Leonard H. King
    Inventor: Richard D. Bogner
  • Dipole and ground plane antennas with improved terminations for coaxial feeders
    Patent number: 4518968
    Abstract: Multiband dipole antennas connected to a coaxial feeder are usually not balanced and are not operated at maximum efficiency. In the present invention pairs of capacitors are connected at the feed point of respective half-wave dipoles, associated with different frequency bands to reduce these deficiencies. A similar technique is useful for single band half-wave dipoles and allows unbalanced multiband ground plane antennas to be constructed.
    Type: Grant
    Filed: September 7, 1982
    Date of Patent: May 21, 1985
    Assignee: National Research Development Corporation
    Inventor: Maurice C. Hately
  • Tuned small loop antenna and method for designing thereof
    Patent number: 4518965
    Abstract: The invention is directed to a tunable loop antenna design which provides impedance matching between the loop antenna and a feed line despite variations of the resonant frequency f.sub.o over a wide range of frequencies. The antenna has a maximum length of one tenth of the wavelength, and comprises a loop conductor and a variable capacitor connected in series with the conductor for providing a resonant circuit. The loop area of the conductor, the circumferential length and equivalent radius thereof are adjusted so that the ratio of the resonant frequency f.sub.o of the antenna and the resonant frequency f.sub.m, at which the input admittance is a minimum, is within the range:0.5-f.sub.o /f.sub.m -3.0.
    Type: Grant
    Filed: February 12, 1982
    Date of Patent: May 21, 1985
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Kazutaka Hidaka
  • Tapered-width leaky-waveguide antenna
    Patent number: 4518967
    Abstract: A leaky waveguide slotted traveling wave antenna having several elongated nonresonant slots (2) oriented with their long axes substantially orthogonal to the direction of propagation within waveguide (1) filled with a dielectric material having a dielectric constant greater than 1. 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. Any angle of radiation between 0.degree. and 135.degree., including endfire and broadside radiation, can be achieved. The width (w) of each slot (2) and the inter-slot spacing (d) can vary; the increase in slot length (m) can be non-uniform.
    Type: Grant
    Filed: March 5, 1982
    Date of Patent: May 21, 1985
    Assignee: Ford Aerospace & Communications Corporation
    Inventor: Charles W. Westerman