Patents by Inventor J. Mark Baird

J. Mark Baird 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: 7602193
    Abstract: The exemplary embodiments of the invention provide techniques that assist in the absorption, reduction or elimination of the resonance of unwanted cavity modes in a cavity measurement system, such as a cylindrical TE0,n cavity measurement system used to measure various dielectric properties of a dielectric sample, for example. One non-limiting, exemplary system includes: sidewalls; a first endplate; a second endplate disposed opposite the first endplate so as to define a cavity bounded by the sidewalls, the first endplate and the second endplate; and first and second radio frequency (RF) coupling receptacles coupled to at least one of the sidewalls, the first endplate or the second endplate, wherein the first and second RF coupling receptacles are configured to pass a RF signal through the cavity. The first endplate has a plurality of conducting loops disposed on a surface facing the second endplate.
    Type: Grant
    Filed: May 11, 2007
    Date of Patent: October 13, 2009
    Assignee: L-3 Communications Corporation
    Inventors: J. Mark Baird, Darren J. Corey
  • Patent number: 5841219
    Abstract: An integrated circuit vacuum tube array includes an insulating or highly resistive substrate, electrically conductive materials disposed on the substrate to define and surround a plurality of first voids extending from the substrate upwardly through the material, a plurality of cathodes disposed on the material to bridge over the respective first voids, for emitting electrons when heated by circuitry that selectively heats the cathodes, first electrically resistive material disposed on the electrically conductive material to surround the cathodes and define a plurality of second voids thereabove, an electrically conductive grid disposed on the electrically resistive material to project partially into the second voids to define an opening in the grid above each cathode, for allowing the passage of electrons therethrough, circuitry to selectively apply a voltage to the grid to control electron flow and thereby control the electrical current produced at the anodes, second electrically resistive material disposed
    Type: Grant
    Filed: January 6, 1997
    Date of Patent: November 24, 1998
    Assignee: University of Utah Research Foundation
    Inventors: Laurence P. Sadwick, R. Jennifer Hwu, J. Mark Baird, Sherman Holmes
  • Patent number: 5396658
    Abstract: A radio frequency millimeter-wave signal antenna and mixer system includes a dielectric substrate having a generally planar upper surface, and a ground-plane layer of conductive material disposed below the upper surface. This ground plane layer includes a plurality of spaced-apart low conductivity sections or windows to allow passage therethrough of radio frequency signals received at a surface of the substrate. A plurality of antennae are disposed on the upper surface of the substrate, with each antenna being positioned over a respective one of the windows in the ground-plane layer. A plurality of mixers are also disposed on the upper surface of the substrate, each adjacent a respective antenna for receiving radio frequency signals therefrom and for producing intermediate frequency signals.
    Type: Grant
    Filed: June 14, 1993
    Date of Patent: March 7, 1995
    Assignee: University of Utah Research Foundation
    Inventors: R. Jennifer Hwu, J. Mark Baird, Roberto W. Alm
  • Patent number: 4902977
    Abstract: A gas ionization type vacuum gauge for testing the internal vacuum levels to below 10.sup.-6 torr is disclosed which uses a multipactor discharge means as the source for the electron current used to ionize residual gas molecules. The invention comprises an RF field enhancing cavity which can be constructed of high-vacuum-compatible materials, able to withstand bake-out microwave temperatures and a negatively biased ion collection wave, wire, or grid. A simple ceramic RF feed-through permits simple and noninvasive pressure measurements. The device can be made much smaller than conventional gauges.
    Type: Grant
    Filed: January 10, 1989
    Date of Patent: February 20, 1990
    Assignee: University of Utah
    Inventors: Michael B. Kenny, Larry R. Barnett, Richard W. Grow, J. Mark Baird
  • Patent number: 4668894
    Abstract: A coupler employing two similar sections of waveguide which extend coliney in longitudinal succession. Adjacent ends of the guide sections are spaced apart to form a gap in the boundary of the sections. A third section of waveguide is disposed external to and coaxial with at least a part of each of the two waveguide sections to provide a boundary surrounding the gap. Electromagnetic energy propagating down one of the two similar sections of waveguide in a first mode and entering the gap is converted partly to a plurality of other modes. The converted energy is reconverted to the first mode upon reaching the other of the two similar sections of waveguide. The electric field pattern exciting the section of waveguide at the end of the gap and propagating down it is exclusively in the first mode.
    Type: Grant
    Filed: April 27, 1981
    Date of Patent: May 26, 1987
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Larry R. Barnett, J. Mark Baird
  • Patent number: 4554483
    Abstract: An RF cyclotron maser type traveling-wave amplifier including an integral active circulator. The amplifier includes a tapered interaction waveguide having a cross-section which gradually increases from a small first end to a larger second end thereof. The waveguide is capable of supporting first and second orthogonal polarization modes therein with approximately the same propagation characteristics for the two modes. A beam of mildly relativistic electrons having helical electron motion is directed into the small first end to axially propagate within the waveguide toward the larger second end. A tapered magnetic field is generated within the waveguide in a direction approximately parallel to the axis of the waveguide. The magnetic field is profiled to near grazing interaction with the second polarization mode of the waveguide. An input electromagnetic wave in the first polarization mode is launched into the larger second end of the waveguide to propagate toward the first end thereof.
    Type: Grant
    Filed: September 29, 1983
    Date of Patent: November 19, 1985
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: J. Mark Baird, Larry R. Barnett, Yue-Ying Lau