Patents by Inventor Thomas Hudspeth

Thomas Hudspeth has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5770909
    Abstract: A field control system for a wound rotor synchronous motor-generator used in electrically powered automobiles is capable of optimizing the performance of the motor-generator for all driving conditions. Using a rotary transformer to transmit power across the rotational boundary, it has no wearing parts and is silent. Preferably, the field control system has common elements with the controller which generates the stator currents of the synchronous motor-generator.
    Type: Grant
    Filed: December 13, 1996
    Date of Patent: June 23, 1998
    Assignee: Rosen Motors, L.P.
    Inventors: Harold A. Rosen, Brian R. Jensen, Thomas Hudspeth
  • Patent number: 5471177
    Abstract: A diplexer (14) has a first rectangular waveguide (38) extending from a front port (16) to a back wall (70), the back wall having a rectangular opening (72) therein constituting a section of a second rectangular waveguide (20) and serving as a back port (18) of the diplexer. A first spectral region of electromagnetic power communicates between the front port and a side port (28), and a second spectral region of electromagnetic power communicates between the front port and the back port. A center frequency of the second spectral region is greater than a center frequency of the first spectral region by a factor greater than or equal approximately to two. The side port includes an aperture (126) disposed in a sidewall (42) of the first waveguide, a third waveguide (32), and a coupling element (128) extending from the third waveguide through the aperture into the first waveguide for coupling electromagnetic power at the first spectral region between the first and the third waveguides.
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: November 28, 1995
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Fritz Steinberg
  • Patent number: 4968957
    Abstract: A diplexer for processing polarized energy at separate transmit and receive frequencies. The nature of the polarization may be circular, linear or elliptical depending upon the phasing associated therewith. The diplexer comprises a waveguide having first and second ports disposed at opposite ends thereof. A symmetrical bandpass resonator arrangement is disposed around the periphery of the waveguide and couples energy at the receive frequency out of the waveguide. A symmetrical bandstop resonator arrangement is also disposed around the periphery of the waveguide and filters energy at the receive frequency to prevent coupling of received energy to the second port. The bandpass resonators of each of the resonator arrangements generally include tuning members that control the amount of energy coupled from the waveguide and that adjust and balance the polarization components of the energy to maintain the polarization state thereof.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: November 6, 1990
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Fritz Steinberg
  • Patent number: 4890118
    Abstract: A feed horn employing a novel compensator design which substantially reduces off-axis cross polarized components of circularly polarized energy over a wide range of angular directions. The compensator comprises a plurality of L-shaped compensating conductors disposed in a generally symmetrical fashion about a longitudinal axis of the feed horn. The conductors extend inwardly from the output aperture of the feed horn and then radially outwards a predetermined distance away from the axis toward the horn sidewall. The conductors are disposed at an angle relative to the axis, which angle is generally defined by an cone whose apex is the same as the apex of the feed horn. A nonconducting support structure supports the conductors within the feed horn. A dielectric matching member is disposed in the feed horn to eliminate unwanted energy reflections.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: December 26, 1989
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Fritz Steinberg
  • Patent number: 4831334
    Abstract: A high efficiency envelope amplifier is disclosed. The invention includes a power supply, a comparator and several switches. The power supply is capable of providing multiple outputs. The comparator measures the amplitude of an input signal against one of several threshold levels. When the input signal is within a predetermined range, a selected power supply output is switched incrementally switches small amounts of power, switching losses are substantially mitigated.
    Type: Grant
    Filed: June 8, 1987
    Date of Patent: May 16, 1989
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, David S. Kaplan, Harold A. Rosen
  • Patent number: 4783639
    Abstract: A wideband microwave diplexer is provided which includes a waveguide section characterized by a longitudinal dimension, and defining first and second longitudinally spaced ports, for propagating microwave power substantially within a first lower frequency band between said first port and said second port; coupling resonator means for coupling microwave power substantially within a second higher frequency band between said waveguide section and a coaxial transmission line; and band stop filter means for substantially preventing microwave power substantially within the second frequency band from propagating to said second port.
    Type: Grant
    Filed: November 21, 1985
    Date of Patent: November 8, 1988
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Fritz Steinberg
  • Patent number: 4777459
    Abstract: A microwave multiplexer has a set of independently tuneable signal channels coupled to a common waveguide. Each of the channels has input and output 3 dB couplers which are joined by cylindrical radiators carrying circularly polarized waves. Both TE and TM waves are propagated within a plurality of resonant cavities within each of the filters. Coupling between the cavities is provided by an array of slots and an array of probes wherein the slots couple TE waves and the probes couple TM waves. Adjustment of the slots and the probes provides for independent coupling coefficients for the two propagation modes. A set of coaxial line probe structures connect between the input and output couplers to end cavities of a filter for the launching of TM waves, there being discs in the end cavities adjacent the probes for converting energy of a TM wave to a TE wave, thereby providing both the TM and the TE wave propagation.
    Type: Grant
    Filed: June 8, 1987
    Date of Patent: October 11, 1988
    Assignee: Hughes Aircraft Company
    Inventor: Thomas Hudspeth
  • Patent number: 4652841
    Abstract: A switch (11) for a square coaxial network includes a lower housing (13), a rotor assembly (21), alternative transmission lines (19), and an upper housing (15) with a main transmission line (17). The rotor assembly includes a rotor (23) for selectively coupling the main transmission line to a selected alternative transmission line. The rotor is coadapted with each transmission line for resonant coupling therewith. A conductive shield (29) rotates with the rotor and isolates it from the unselected alternative transmission lines. A low-friction dielectric guide (25) helps provide proper spacing and coupling of the rotor and the square center conductor (35) of the selected alternative transmission line. A low-friction dielectric bushing (27) serves a similar function for the rotor and the center conductor of the main transmission line.
    Type: Grant
    Filed: May 4, 1984
    Date of Patent: March 24, 1987
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Barry S. Ross
  • Patent number: 4539681
    Abstract: A modulator system for converting a three-channel input microwave signal to a single-channel output microwave signal is formed of two microwave sections which are joined together at both their inputs and their outputs by hybrid circuits, one of which serves as a power divider and the other which serves as a power combiner. Each of the microwave sections includes a pair of couplers which are joined by a Faraday rotator. First and second microwave input signals are applied to a first port of an input coupler in each of these sections. A third microwave signal is connected by the hybrid divider to a second input port in the input couplers of each of the microwave sections. Polarization of the third signal is vertical and is maintained through the two sections. Polarization of the first and second signals is horizontal and is maintained through the two sections.
    Type: Grant
    Filed: February 25, 1983
    Date of Patent: September 3, 1985
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Harold A. Rosen, Fritz Steinberg
  • Patent number: 4539534
    Abstract: A hybrid coupler is of the type known as a transverse electromagnetic mode, coupled transmission line coupler. The hybrid coupler is formed within a plate of metal by milling out channels of square cross-sections therein. The walls of the channels serve as outer conductors of coaxial lines, there being inner conductors of square cross-section positioned within the channel. A diagonally disposed window crosses the intersection of the ports and includes a separator. The central conductors of the respective coaxial lines are joined by diagonally disposed segments of inner conductor such that each pair of coaxial lines is so joined. Each pair of lines provides a pair of ports. The line segments are spaced apart by a spring-loaded separator for rigidly maintaining a coupling distance.
    Type: Grant
    Filed: February 23, 1983
    Date of Patent: September 3, 1985
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Richard V. Basil, Jr., Harmon H. Keeling
  • Patent number: 4533883
    Abstract: A crossover for a microwave circuit constructed within a plate includes intersecting square-shaped coaxial transmission lines, each of which is formed by machining channels within the plate, with square-shaped central members disposed along the axes of the channels and insulated from the side walls thereof. The plate is made of an electrically conducting material to provide for the structure of a coaxial line of which the members thereof have a rectangular, preferably square-shaped, cross-section. At the intersection of two of the transmission lines, a septum is placed, the septum being parallel to the plane of the plate. The septum is located halfway between the top and the bottom portions of the channels. An inner, or central, conductor segment of reduced cross-section is slung beneath the termini of rod-shaped members in one line so as to pass beneath the septum and to provide for the structure of a coaxial transmission line beneath the septum.
    Type: Grant
    Filed: February 23, 1983
    Date of Patent: August 6, 1985
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Harmon H. Keeling
  • Patent number: 4533884
    Abstract: An adapter of a coaxial transmission line to a waveguide is provided for connecting the waveguide to a microwave circuit of coaxial lines which is formed by milling out the lines within a plate of a soft metal. The coaxial transmission lines are of rectangular, preferably square, cross-section with the outer conductors thereof being provided by the walls of the channel. The inner conductors of the coaxial lines are rod-shaped, the inner conductors also being of rectangular or square cross-section. An aperture is provided in an outer wall of the coaxial line. A stem connects with an inner conductor and passes through the aperture to extend outwardly therefrom. A waveguide is positioned with its propagation axis parallel to the stem, the waveguide enclosing the stem and being secured to the outer walls of the coaxial lines. The stem is placed adjacent the inner wall of the waveguide, but spaced apart therefrom to support a transverse electromagnetic wave.
    Type: Grant
    Filed: February 23, 1983
    Date of Patent: August 6, 1985
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Harmon H. Keeling
  • Patent number: 4427953
    Abstract: Apparatus for processing microwave signals at two predetermined frequencies. Signals at a first predetermined frequency are received or transmitted at one end (input port) of a microwave transmission line whose other end is utilized as a common output port for transmitting and receiving signals at both predetermined frequencies. A band rejection portion is provided which comprises first and second rejection resonators orthogonally disposed along the transmission line at two predetermined positions. A bandpass portion, comprised of a plurality of collinearly aligned bandpass resonators, is disposed at a third predetermined position along the transmission line. Signals at a second predetermined frequency are transmitted or received at a second input port which is part of the bandpass portion. All resonators are capacitively coupled together and to the transmission line.
    Type: Grant
    Filed: November 16, 1981
    Date of Patent: January 24, 1984
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Harmon H. Keeling
  • Patent number: 4138648
    Abstract: A wideband synchronously pumped parametric amplifier is described that features minimum time delay along with wide bandwidth, a low noise figure and cost for advantageous use in receivers designed to receive television signals from a satellite through a relatively small antenna, the amplifier obtaining maximum bandwidth by the use of two diodes in parallel and two double-tuned circuits, where the diode capacities are large enough to swamp parasitic and coupling capacitances.
    Type: Grant
    Filed: April 3, 1978
    Date of Patent: February 6, 1979
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Harmon H. Keeling
  • Patent number: 4119931
    Abstract: A TEM-mode transmission line switch coupling essentially all input power at a first port to a fourth port when in its uncoupled position and coupling a predetermined significant fraction of the input power to a second port with the remainder coupled to the fourth port when in its coupled position, the switch including a relatively wide spaced parallel transmission line section with a rotatable conductive vane disposed between the parallel lines to allow coupling of power between the lines in the coupled position and inhibit such coupling in the uncoupled position.
    Type: Grant
    Filed: July 6, 1976
    Date of Patent: October 10, 1978
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Harmon H. Keeling
  • Patent number: 4117426
    Abstract: A multiple channel microwave rotary joint is disclosed which is a toroidal cavity having first and second halves each with a bearing surface for rotation about the axis of the toroid. A plurality of input ports are mounted about the external cylindrical surface of the first half for generating a plurality of modes within the toroidal cavity. A first hybrid network is coupled to the inut ports for providing the proper phase input signals for generating the various modes. A second hybrid network is connected to a plurality of output probes mounted to the second half of the toroidal cavity. The rotary joint has a passageway which is axially aligned for allowing a plurality of multichannel rotary joints to be "stacked" and the interconnecting microwave cables or waveguides to pass through the passageways.
    Type: Grant
    Filed: December 30, 1976
    Date of Patent: September 26, 1978
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Harold A. Rosen
  • Patent number: 4060781
    Abstract: A simplified waveguide switch is disclosed having a rotatable quarter wave plate for generating selected amounts of right hand and left-hand circular polarized waves. A linearly polarized signal, in the TE.sub.11 mode, is launched into a cylindrical waveguide member. A quarter-wave plate is disposed within the cylindrical waveguide and imparts a right or left-hand circular polarization to the linear wave depending upon the orientation of the quarter wave plate with respect to the linear wave. The rotation angle of the quarter wave plate is adjusted by a stepping motor.
    Type: Grant
    Filed: September 16, 1976
    Date of Patent: November 29, 1977
    Assignee: Hughes Aircraft Company
    Inventors: Thomas Hudspeth, Harmon H. Keeling