Patents by Inventor Landon Rowland

Landon Rowland 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).

  • Method of designing a circulator
    Patent number: 6917250
    Abstract: A radio frequency (RF) circulator includes a low temperature co-fired ceramic (LTCC) substrate and a ferrite structure disposed in the LTCC substrate. The circulator also includes first, second and third transmission lines disposed in the LTCC substrate and coupled between the ferrite disk and first, second and third ports of the circulator. The ferrite structure embedded in the LTCC substrate is exposed to an appropriate direct current (DC) magnetic field, to provide the circulator as an integrated LTCC substrate circulator.
    Type: Grant
    Filed: December 7, 2004
    Date of Patent: July 12, 2005
    Assignee: Raytheon Company
    Inventors: Robert B. Lombardi, Joseph S. Pleva, Landon Rowland, Paul Setzco
  • Low temperature co-fired ceramic (LTCC) circulator
    Publication number: 20050093641
    Abstract: A radio frequency (RF) circulator includes a low temperature co-fired ceramic (LTCC) substrate and a ferrite structure disposed in the LTCC substrate. The circulator also includes first, second and third transmission lines disposed in the LTCC substrate and coupled between the ferrite disk and first, second and third ports of the circulator. The ferrite structure embedded in the LTCC substrate is exposed to an appropriate direct current (DC) magnetic field, to provide the circulator as an integrated LTCC substrate circulator.
    Type: Application
    Filed: December 7, 2004
    Publication date: May 5, 2005
    Inventors: Robert Lombardi, Joseph Pleva, Landon Rowland, Paul Setzco
  • Low temperature co-fired ceramic (LTCC) circulator
    Patent number: 6844789
    Abstract: A radio frequency (RF) circulator includes a low temperature co-fired ceramic (LTCC) substrate and a ferrite structure disposed in the LTCC substrate. The circulator also includes first, second and third transmission lines disposed in the LTCC substrate and coupled between the ferrite disk and first, second and third ports of the circulator. The ferrite structure embedded in the LTCC substrate is exposed to an appropriate direct current (DC) magnetic field, to provide the circulator as an integrated LTCC substrate circulator.
    Type: Grant
    Filed: September 4, 2002
    Date of Patent: January 18, 2005
    Assignee: Raytheon Company
    Inventors: Robert B. Lombardi, Joseph S. Pleva, Landon Rowland, Paul Setzco
  • Low temperature co-fired ceramic (LTCC) circulator
    Publication number: 20030090335
    Abstract: A radio frequency (RF) circulator includes a low temperature co-fired ceramic (LTCC) substrate and a ferrite structure disposed in the LTCC substrate. The circulator also includes first, second and third transmission lines disposed in the LTCC substrate and coupled between the ferrite disk and first, second and third ports of the circulator. The ferrite structure embedded in the LTCC substrate is exposed to an appropriate direct current (DC) magnetic field, to provide the circulator as an integrated LTCC substrate circulator.
    Type: Application
    Filed: September 4, 2002
    Publication date: May 15, 2003
    Inventors: Robert B. Lombardi, Joseph S. Pleva, Landon Rowland, Paul Setzco
  • Multi-octave, low profile, full instantaneous azimuthal field of view direction finding antenna
    Patent number: 5506592
    Abstract: An antenna which comprises a plurality of spaced apart antenna segments (1-8) which are electrically isolated from each other and form a conical antenna structure, an insulator (9) disposed between each of the antenna segments, a plurality of conductors (11), each coupled to a different one of the antenna segments, for sampling a predetermined parameter at the associated antenna segment and a ground plane (10) normal to the axis of the conical structure. The antenna segments are substantially pie-shaped. In a second embodiment of the invention, the antenna segments are disposed on an electrically insulating sheet, each of the antenna segments being flared at the corner regions thereof (22) remote from the apex of the conical structure. The space between each of the segments is a slot, the slot operational as a slot antenna when the segments on opposing sides of the slot are excited 180 degrees out of phase.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: April 9, 1996
    Assignee: Texas Instruments Incorporated
    Inventors: Alan D. MacDonald, Landon Rowland