Patents Examined by Paul L. Gensler
  • Patent number: 4441091
    Abstract: A low loss leakage transmission line including a cylindrical dielectric tube the wall thickness d.sub.2 of which is selected to satisfy ##EQU1## where .epsilon..sub.1 is the dielectric constant of the internal space within the tube, .epsilon..sub.2 is the dielectric constant of the material which forms the tube, and n is a positive odd integer. A loss layer may be disposed around the cylindrical dielectric tube to capture any lost wave energy. In one embodiment, a plurality of cylindrical dielectric tubes of different dielectric constants are coaxially arranged with the wall thickness of each of the tubes satisfying the above formula.
    Type: Grant
    Filed: July 22, 1982
    Date of Patent: April 3, 1984
    Assignee: Hitachi Cable Ltd.
    Inventors: Shigeo Nishida, Mitsunobu Miyagi, Koichi Mikoshiba
  • Patent number: 4439748
    Abstract: The present invention relates to a rectangular corrugated waveguide or feedhorn wherein a plurality of adjacent grooves of a predetermined depth and cross-section are formed, preferably by numerical machining, in a major exposed surface of each of four plates of an electrically conductive material. The four plates are then secured together to form a rectangular corrugated passage therebetween where the ends of the line of grooves in one plate substantially meet and are aligned with the ends of corresponding grooves in another plate to form a solid line of electrically conductive material at the corners of the passage.
    Type: Grant
    Filed: June 28, 1982
    Date of Patent: March 27, 1984
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Corrado Dragone
  • Patent number: 4439749
    Abstract: An electronic tuning block including a plurality of screw drive type variable resistors are juxtaposed parallel to one another obliquely on an insulating substrate, and holes for receiving pointers fitted to the screws of the variable resistors and holes for receiving rotary knobs fitted to the tips of the screw shaft are formed on the upper surface of a box-shaped insulating case which is fixed to the insulating substrate.
    Type: Grant
    Filed: March 30, 1982
    Date of Patent: March 27, 1984
    Assignee: Alps Electric Co., Ltd.
    Inventors: Hiroaki Komatsu, Kenji Yoshioka
  • Patent number: 4438436
    Abstract: An improved monopulse comparator circuit is achieved by a unique circuit layout. Four hybrid junctions are arranged on a low dielectric constant substrate and are interconnected in such way as to form a closed square figure. Distances between adjacent hybrid junctions are thus minimized. Input lines which connect the comparator circuit to a monopulse antenna array are disposed on the substrate external to the closed figure, as are output lines which connect the comparator to a monopulse guidance system. Right angle microstrip to waveguide transitions are used so that the comparator circuit need not be integrated onto the same substrate as the antenna array and the guidance system. The entire comparator layout is channelized to increase isolation between closely spaced lines.
    Type: Grant
    Filed: December 4, 1981
    Date of Patent: March 20, 1984
    Assignee: Motorola Inc.
    Inventor: Earl R. Murphy
  • Patent number: 4438415
    Abstract: A digitally programmable attenuator for high speed and a large dynamic range is constructed with a phase-controlled attenuator for small steps of attenuation and an attenuator of switched resistive pads for larger steps. The attenuators are connected in tandem and actuated combinatorially with the phase-controlled attenuator being switched into operation for the small steps, and the resistive pads being switched into operation for the large steps. A phase-controlled attenuator is constructed to permit adjustment of the attenuator characteristic, and a switched-pad attenuator is constructed to be phase shiftless.
    Type: Grant
    Filed: January 29, 1982
    Date of Patent: March 20, 1984
    Assignee: General Microwave Corporation
    Inventor: Samuel Hopfer
  • Patent number: 4438408
    Abstract: Disclosed is an apparatus having a signal attenuating portion for setting the gain or loss in amplitude of an electrical signal received by the apparatus, and alternatively, provides a gain of unity without a change of setting. The apparatus employs a plurality of switching devices which may be selectively opened and closed to provide the apparatus with a fixed gain of unity and alternatively predetermined losses or gains to the input signals.
    Type: Grant
    Filed: August 17, 1982
    Date of Patent: March 20, 1984
    Assignee: Harvey Hubbell Incorporated
    Inventors: Ambroz K. Skrovanek, Carl A. Evert
  • Patent number: 4438414
    Abstract: A tone control circuit is provided having several parallel channels each of which comprises an electronic potentiometer. In each of the channels is disposed a filtering element. Thus, for an output terminal common to the different channels, each of the channels comprises a filter comprising a series element corresponding to the series element of this channel and a parallel element corresponding to the series elements placed in parallel of the other channels. The present invention simplifies the construction of tone control circuits in the form of integrated circuits.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: March 20, 1984
    Assignee: Thomson-CSF
    Inventor: Denis Blachot
  • Patent number: 4437077
    Abstract: The impedance value of the semiconductor device usable at very high frequencies is preset during manufacture.The device comprises a Gunn or Zener diode coupled to a coaxial line. The central conductor of the line is constituted by a metal wire mandrel or a metal coating deposited on a glass fibre section.The outer cylinderical conductor is a cylindrical metal coating deposited on a ring of dielectric material, such as glass and which surrounds the diode.Application to microstrip, transmitting antenna and radial cavity circuits.
    Type: Grant
    Filed: July 31, 1981
    Date of Patent: March 13, 1984
    Assignee: Thomson-CSF
    Inventors: Raymond Henry, Michel Heitzmann
  • Patent number: 4437074
    Abstract: The present invention provides an ultrahigh-frequency transmission line of the three-plate air type comprising two parallel conducting plates, the space separating these two plates being filled with air, a central conducting strip placed between said two plates and a plurality of dielectric material supports spread out along each side of said strip, each support comprising a notch in each of which said strip is positioned so as to be held in place.
    Type: Grant
    Filed: December 14, 1981
    Date of Patent: March 13, 1984
    Assignee: Thomson-CSF
    Inventors: Georges Cohen, Jean Heroux
  • Patent number: 4437073
    Abstract: An equalizer cavity apparatus which is directionally coupled to a rectangular waveguide utilizes a circular waveguide with an adjustable RF absorber therein to lower the quality factor, Q, of the equalizer cavity.
    Type: Grant
    Filed: February 9, 1982
    Date of Patent: March 13, 1984
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Herbert L. Thal, Jr.
  • Patent number: 4435680
    Abstract: A microwave resonator is formed by a cylindrical loop and one or more gaps which extend along its length. The loop is formed from a machineable insulating material and a layer of electrically conductive material is deposited over its surfaces.
    Type: Grant
    Filed: March 25, 1982
    Date of Patent: March 6, 1984
    Assignee: Medical College of Wisconsin
    Inventors: Wojciech Froncisz, James S. Hyde
  • Patent number: 4435689
    Abstract: A broadband attenuator section in a meander line slow wave structure is dlosed for attenuating signals reflected between the output and input of the slow wave structure. The attenuator section comprises a multi-element ceramic support structure intermediate the meander line conductor pattern and the substrate wherein the support elements are comprised of a beryllium oxide-silicon carbide ceramic composition with a taper in the percentage of silicon carbide being provided in the transition region from a loss free section of the slow wave structure to a lossy attenuator section. The taper in percentage involves the use of ceramic support elements arranged in a sequence of 1%, 2% and 5% silicon carbide composition prior to the main attenuator section which is comprised of 10% silicon carbide - 90% beryllium oxide support elements.
    Type: Grant
    Filed: May 10, 1982
    Date of Patent: March 6, 1984
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Hunter L. McDowell
  • Patent number: 4434426
    Abstract: The device consist of a latching, nonreciprocal ferrite phase shifter, a ching Faraday rotator, a radiating element and the required matching transformers combined into a single unit used as a phased array element. The phase shift is provided by a toroid type non-reciprocal ferrite phase shifter. The polarization rotation is provided by an axially magnetized ferrite filled waveguide. The impedance matching between the sections is achieved with ceramic transformers. This device provides full polarization control.
    Type: Grant
    Filed: January 11, 1982
    Date of Patent: February 28, 1984
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Stanley Gaglione, James A. O'Hare
  • Patent number: 4434409
    Abstract: A non-reciprocal latching phase-shifter uses a slab of a high-dielectric constant material embedded in ferrite to substantially concentrate the electromagnetic energy within the dielectric slab, thus eliminating the need for a conductive waveguide, and to provide for a small amount of energy leakage into the adjacent ferrite whose state of magnetization can be varied, thus providing for a variable phase-shift. In one embodiment, parallel high-K dielectric strips are sandwiched between grooved ferrite sheets to provide a low-cost phase-shifter array.
    Type: Grant
    Filed: June 11, 1981
    Date of Patent: February 28, 1984
    Assignee: Raytheon Company
    Inventor: Jerome J. Green
  • Patent number: 4433314
    Abstract: A millimeter wave suspended substrate multiplexer is disclosed which is comprised of a plurality of hybrid-filter-hybrid channel dropping sections. The components of the multiplexer are enclosed in a metallic housing forming a cavity surrounding the multiplexer components. Each of the hybrid-filter-hybrid sections is comprised of first and second 90.degree. hybrid couplers which are connected by a pair of identical bandpass filters. Spurious waveguide energy propagation modes which would otherwise be generated in the cavity surrounding the 90.degree. suspended hybrid couplers are eliminated by the use of a plurality of mode suppression pins extending between the top and bottom portions of the metallic housing and passing through the branch lines of the couplers.
    Type: Grant
    Filed: January 21, 1982
    Date of Patent: February 21, 1984
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Alfred R. Hislop, David Rubin
  • Patent number: 4433313
    Abstract: A method and apparatus for directionally coupling two technically different microwave transmission lines, one being a waveguide and the other a stripline, in which a central conductor of the stripline is plunged into waveguide through a slot in a wall of the waveguide and loaded by capacitors or inductors. The width of the central conductor and values of the capacitors and inductors determines the desired coupling coefficient.
    Type: Grant
    Filed: September 9, 1981
    Date of Patent: February 21, 1984
    Assignee: Societe d'Etude du Radant
    Inventors: Jacques Saint, Gerard Collignon
  • Patent number: 4431974
    Abstract: An improved microwave circuit is disclosed for enabling impedance tuning for power coupling in IMPATT diode and other similar oscillator and amplifier circuits. An electrically conductive support plate forming a ground plane is machined to form a channel for slidably receiving an air-stripline transmission line and a resonator therein. An IMPATT diode is positioned within the channel through an opening extending through the support plate generally perpendicular to the channel and is positioned in contact with the resonator. An electrically conductive bias filter is coupled to the resonator and to an adjusting mechanism for moving the resonator along the channel and providing a DC bias to the diode for oscillation. An electrically conductive cover member retains a spring biased electrically non-conductive projection for maintaining the resonator in contact with the diode.
    Type: Grant
    Filed: February 22, 1982
    Date of Patent: February 14, 1984
    Assignee: Rockwell International Corporation
    Inventor: Donnie L. Landt
  • Patent number: 4430630
    Abstract: To suppress a fluctuation in resonance frequency caused by an input signal voltage in a tunable circuit, a respective capacitor is connected to each of two variable capacitance diodes connected in series-opposition.
    Type: Grant
    Filed: November 19, 1981
    Date of Patent: February 7, 1984
    Assignee: Pioneer Electronic Corporation
    Inventor: Masaharu Sakamoto
  • Patent number: 4429949
    Abstract: An optical fiber connector in which individual optical fibers are precisely centered at their opposed ends, with respect to each other, without the requirement of precise manufacturing tolerances of the connector parts. An individual optical fiber having an elastic sheath is centered within a rigid sleeve by a plurality of balls, which can be metal, circumferentially spaced around the elastic sheath of the optical fiber, and which radially compress the elastic sheath to precisely center the fiber with respect to the rigid sleeve. The balls can be retained in a cage of an optical ferrule against both radial escape and any significant axial displacement relative to the fiber. This arrangement permits connecting and disconnecting the individual fibers from the connector, with a low coupling and uncoupling force since the balls can roll and therefore do not damage either the rigid sleeve or the elastic sheath of a fiber.
    Type: Grant
    Filed: September 9, 1980
    Date of Patent: February 7, 1984
    Assignee: Radiall
    Inventor: Jacques Cartier
  • Patent number: 4429290
    Abstract: An unsymmetrically corrugated TE.sub.01 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 corrugations are comprised of a plurality of adjacent internal ridges and valleys having substantially parallel walls such that the distance between the parallel walls of the internal ridges are at least twice the distance between the parallel walls of the internal valleys.
    Type: Grant
    Filed: October 29, 1979
    Date of Patent: January 31, 1984
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Joseph M. Devan