Patents Represented by Attorney William H. Anderson
-
Patent number: 5561407Abstract: A phase shifter having a single or monolithic ferroelectric material and a lurality of ferroelectric transmission lines formed thereon, each having a different effective physical length and associated delay or phase shift. The plurality of different lengths of ferroelectric transmission lines has a voltage source associated therewith for applying a predetermined bias voltage, resulting in a change in permitivity in the ferroelectric substrate material. The different lengths of ferroelectric transmission line formed on the single substrate have a predetermined relationship between their effective physical linear lengths. By selectively activating the different lengths of ferroelectric transmission line by applying a bias voltage in different combinations, a desired or predetermined phase shift is obtained. The single or monolithic ferroelectric substrate used greatly reduces the overall length of the ferroelectric phase shifter.Type: GrantFiled: January 31, 1995Date of Patent: October 1, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Thomas E. Koscica, Richard W. Babbitt, William C. Drach
-
Patent number: 5561435Abstract: A planar dual band antenna comprising three superimposed dielectric layers, ground plane on one external surface, a conductive patch on the other and parallel conductive strips at the interface of dielectric layers that is closer to the patch. The dielectric constant of the middle layer is different from that of the two other layers.Type: GrantFiled: February 9, 1995Date of Patent: October 1, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Vahakn Nalbandian, Choon Sae Lee, Felix Schwering
-
Patent number: 5558905Abstract: A substrate free single crystal pyroelectric film particularly suited for use in rapid thermal response sensors is made from a single crystal substrate by a method including the steps of:(A) etching a pattern into the substrate;(B) epitaxially growing a highly oriented superconducting material into the etched pattern to fill the etched pattern,(C) epitaxially growing a highly oriented crystalline film of a pyroelectric material over the entire surface of the substrate, and(D) dissolving away the highly oriented superconducting material.Type: GrantFiled: July 12, 1995Date of Patent: September 24, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventor: Donald W. Eckart
-
Patent number: 5545945Abstract: A thermionic cathode having an overcoating of emissive material having a position including a mixture Aluminum Tungstate and Scandium Tungstate which react, when heated, to provide the cathode with enhanced electron emissions.Type: GrantFiled: March 29, 1995Date of Patent: August 13, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Louis E. Branovich, Donald W. Eckart, Paul Fischer
-
Patent number: 5543808Abstract: A dual-band antenna in which EHF signals are connected to one end of a wauide and radiated from the other and wherein a half-dipole for VHF signals is connected to the radiating end of the waveguide and the other half-dipole for VHF is formed by a shield that is coaxial with and surrounds all of the waveguide except the radiating end. VHF signals are coupled to the half-dipole formed by the shield via a matching network.Type: GrantFiled: May 24, 1995Date of Patent: August 6, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Bernard E. Feigenbaum, Francis G. Loso
-
Patent number: 5541563Abstract: A trapped flux, iron structure, which prevents bunching of interior flux es during an application of a field force, is provided. This iron structure includes a plurality of elongate identical subassemblies, each subassembly having a rod composed of a soft ferromagnetic material and each rod having a superconductive sheath.Type: GrantFiled: January 11, 1995Date of Patent: July 30, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventor: Herbert A. Leupold
-
Patent number: 5536954Abstract: An optically coupled FET comprised of bottom layer, a top layer in which FET is formed and an intermediate layer having a waveguide communicating with a grating in registration with the FET.Type: GrantFiled: August 17, 1994Date of Patent: July 16, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Arye Rosen, Arthur C. Paolella, Peter R. Herczfeld, Joseph H. Abeles
-
Patent number: 5535045Abstract: The dielectric constant and the optical properties of a semiconductor device are changed by tuning the electron density in modulation doped quantum wells. The quantum wells are formed in an "i" region of a p-i-n structure having, in sequence, a 150 .ANG. wide GaAs quantum well, a wider Al.sub.x Ga.sub.1-x As barrier with a central silicon doped section and an undoped AlGaAs barrier with a slightly higher barrier height to prevent transfer of carriers to the next well. When a reverse bias is applied, more D centers are tuned below the Fermi level so that they can trap electrons from the wells, thereby reducing electron density and changing the optical properties of the material.Type: GrantFiled: March 17, 1994Date of Patent: July 9, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Mitra Dutta, Weimin Zhou
-
Patent number: 5532666Abstract: A charged particle trap having a spherical shell of magnetic material and a pherical hollow cavity positioned concentrically within the shell. A polar axis passes through the center of the shell and cavity. The shell is permanently magnetized to produce a double-tapered magnetic field having barrel-shaped flux lines that are concentrated at the cavity poles. The magnetic material has a remanence B.sub.r (.theta.) that varies in direction and magnitude such that its angular orientation .alpha. with respect to the polar axis varies as a function of the polar angle .theta. of the material's average location in accordance with the equation .alpha.=2.theta.. The magnitude of the remanence B.sub.r (.theta.) varies according to the following expressions: B.sub.r (.theta.)=B.sub.r (0) [B.sub.r (.pi./2)-B.sub.r (0)] 2.theta./.pi., for average polar angles between .theta.=0 radians and .theta.=.pi./2 radians; and B.sub.r (.theta.)=B.sub.r (.pi./2) [B.sub.r (.pi./2)-B.sub.r (0)] (2.theta.-.pi.)/.pi.Type: GrantFiled: May 31, 1995Date of Patent: July 2, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventor: Herbert A. Leupold
-
Patent number: 5528717Abstract: A slab dielectric waveguide for the millimeter and sub-millimeter wave regions is achieved by providing a thin grounded dielectric slab of rectangular cross-section into which a sequence of equally spaced cylindrical lenses are fabricated. The axis of these lenses coincides with the center line of the slab guide, i.e. the propagation direction of the guide. The spacing of the lenses S is assumed to be on the order of many guide wavelengths .lambda.; the width of the slabguide w is on the order of at least several .lambda.; and the thickness d of the guide typically is sufficiently small so that only the fundamental surface wave mode can exist on the slab. If the permittivity of the lenses exceeds that of the guide, the lenses will have a convex shape and in the opposite case, the lenses will have a concave shape. As those skilled in the art will appreciate, the concave shape will simplify the fabrication of guide and will reduce its diffraction losses.Type: GrantFiled: June 10, 1994Date of Patent: June 18, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Felix Schwering, James W. Mink
-
Patent number: 5523732Abstract: A permanent magnet structure providing an internal magnetic field having an djustable magnitude and direction. The structure utilizes a shell composed of a predetermined number of concentric permanent magnet cylinders, each of which generates a discrete tunable magnetic field for tuning the magnitude and direction of the internal working field. Depending on the magnitude and direction of each discrete magnetic field, the magnitude and direction of the working field can be controlled and adjusted as desired.Type: GrantFiled: October 16, 1995Date of Patent: June 4, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventor: Herbert A. Leupold
-
Patent number: 5519717Abstract: This invention provides a method for substantially reducing the time drift f a network clock in a frequency hopping communications system, without the need for a master unit to keep network time. The automatic network time tracking mechanism of each receiver is disabled when a network time update is received within a critical period of time from the closest synchronization update time or frequency hop time. The critical period is defined as the time between the closest synchronization update time to the local time when reception occurs less one-half the minimum tracking adjustment of the receiver plus the minimum processing or decoding delay, and that closest synchronization update time plus one half the minimum tracking adjustment of the receiver plus the maximum processing or decoding delay.Type: GrantFiled: August 24, 1994Date of Patent: May 21, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Gregory Lorenzo, Kenneth J. Loffer
-
Patent number: 5500201Abstract: The physical and chemical properties of carbon blacks are modified by expng them to a room temperature gas plasma.Type: GrantFiled: November 22, 1994Date of Patent: March 19, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Michael Binder, Robert J. Mammone
-
Patent number: 5495253Abstract: A soliton rejection filter circuit is provided, for use in RF signal procing, for isolating a low level signal in the presence of stronger nearby interfering signals and detecting its modulation over a wide communication bandwidth centered at a relatively low RF frequency. The soliton filter circuit includes a nonlinear transmission line and a filter circuit.Type: GrantFiled: November 17, 1994Date of Patent: February 27, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Stuart D. Albert, William J. Skudera, Jr.
-
Patent number: 5494763Abstract: An improved electrochemical cell is provided using a high surface area can electrodes as the negative electrode in an alkali metal hydroxide electrolyte.Type: GrantFiled: May 24, 1995Date of Patent: February 27, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Wishvender K. Behl, Edward J. Plichta
-
Patent number: 5488226Abstract: An thermal imaging device having a transparent substrate, an active multiple quantum well (MQW) epilayer with bottom electrical contacts bonded to the substrate, wherein the substrate is cut such that its thermal expansion coefficient is matched or roughly matched to that of the MQW epilayer in the direction parallel to the long axis of the bottom contacts and so that the thermal expansion coefficient of the substrate is mismatched in a direction normal to the long axis of the bottom contacts. Infrared radiation incident on each unit cell of the n.times.m array will produce a temperature change .DELTA.T in the MQW which will produce stress normal to the long axis of the bottom contacts. The uniaxial stress produced by the temperature changes .DELTA.T breaks the rotation symmetry in the plane of the MQW structure.Type: GrantFiled: November 18, 1994Date of Patent: January 30, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Gerald J. Iafrate, Mitra Dutta, Paul H. Shen, Michael A. Stroscio
-
Patent number: 5488333Abstract: An oscillator is isolated from external mechanical and thermal effects by surrounding the oscillator on all sides with a thermally insulating medium such as an aerogel insulation structure that provides both thermal insulation and vibrational isolation. Power is supplied to the crystal oscillator without wires. Wires are eliminated by using modulated microwaves or millimeter waves to transmit power and signals into and out of the oscillators, such as with small, efficient transceivers utilizing microwave or millimeter-wave integrated circuits or use of solid-state light sources and photodetectors in combination with thermal insulation which is transparent to the wavelengths of the electromagnetic radiation.Type: GrantFiled: April 7, 1995Date of Patent: January 30, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventor: John R. Vig
-
Patent number: 5486992Abstract: A high voltage direct current power supply having feedback control and a tection circuit for maintaining a controlled, stabilized output voltage. An oscillator is coupled to a transformer which in turn is coupled to a voltage multiplier. A feedback control is coupled to the transformer and the voltage multiplier which provides feedback to the transformer for maintaining an accurate, stable output voltage. Coupled to the feedback control is a protection circuit which prevents the output voltage from exceeding a predetermined output voltage. Additionally, the protection circuit shuts down the power supply if a short circuit occurs at the output. In one embodiment, the voltage multiplier is comprised of a plurality of voltage doubler diode and capacitor pairs. The feedback control is comprised of a comparitor and a buffer which drives a transistor coupled to the primary of the transformer, which acts as a feedback loop. The protection circuit includes a J-K flip-flop.Type: GrantFiled: January 9, 1995Date of Patent: January 23, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Thomas E. Koscica, William C. Drach
-
Patent number: H1535Abstract: A method for making books, papers and film more resistant to moisture and pollution degradation using a low pressure, low temperature gas plasma.Type: GrantFiled: November 23, 1994Date of Patent: June 4, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Michael Binder, Robert J. Mammone
-
Patent number: H1570Abstract: A quantum interference device in the form of a variable lateral confinement resonant tunneling transistor having a quantum waveguide structure including a primary current transmission path defined by a region between source and drain electrodes and where there is a resonance region therebetween in which quantum interference of tunneling wave functions establish a resonance tunneling condition that extends beyond the primary current path. Upon the application of a voltage across the drain and source electrodes, a tunneling current can be made to flow. A gate electrode formed on the quantum well structure remote from the primary current transmission path includes a variable depletion region thereunder or an electrostatic pinch off region, the size of which is a function of the magnitude of the bias voltage applied thereto.Type: GrantFiled: March 31, 1993Date of Patent: August 6, 1996Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Robert A. Lux, James F. Harvey