Patents by Inventor Govind R. Kadambi

Govind R. Kadambi 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: 7403160
    Abstract: A low profile smart antenna includes an active antenna element carried by a dielectric substrate, and active antenna element has a T-shape. Passive antenna elements are carried by the dielectric substrate, and they have an inverted L-shaped portion laterally adjacent the active antenna element. Impedance elements are selectively connectable to the passive antenna elements for antenna beam steering.
    Type: Grant
    Filed: June 16, 2005
    Date of Patent: July 22, 2008
    Assignee: Interdigital Technology Corporation
    Inventors: Bing A. Chiang, Michael J. Lynch, Douglas H. Wood, Thomas Liu, Govind R. Kadambi, Mark W. Kishler
  • Patent number: 7180465
    Abstract: A smart antenna includes an active antenna element, a passive antenna element laterally adjacent the active antenna element, and an impedance element selectively connectable to the passive antenna element for antenna beam steering. A ground plane includes a center portion adjacent the active antenna element, and first and second arms extending outwardly from the center portion. The first arm is connected to the impedance element, and the second arm is laterally adjacent the first arm.
    Type: Grant
    Filed: August 11, 2005
    Date of Patent: February 20, 2007
    Assignee: InterDigital Technology Corporation
    Inventors: Michael J. Lynch, Thomas Liu, Bing A. Chiang, Govind R. Kadambi
  • Patent number: 7109931
    Abstract: The present invention provides a method to measure antenna efficiency using the cavity method. In particular, the present invention provides a tunable cavity that can be tuned to avoid the anti resonance and antenna-cavity coupling problems. In particular, tuning probes and/or variable volumetric sizing of the cavity are used to tune the cavity to avoid the anti resonance and antenna-cavity coupling.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: September 19, 2006
    Assignee: Centurion Wireless Technologies, Inc.
    Inventors: Govind R. Kadambi, Ram M. Narayanan, Yeqin Huang, Gordon Evert, James Blake Winter
  • Patent number: 7109932
    Abstract: The present invention provides, an antenna test device to test antenna efficiency. The test device includes a cavity formed by at least one conductive sidewall. The cavity contains at least one tuning probe, at least one movable portion, or a combination thereof. The tuning probes and/or movable portion help inhibit the antenna under test from having faulty measurements due to anti resonance or coupling.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: September 19, 2006
    Assignee: Centurion Wireless Technologies, Inc.
    Inventors: Govind R. Kadambi, Ram M. Narayanan, Yeqin Huang, Gordon Evert, James Blake Winter
  • Publication number: 20050280591
    Abstract: The present invention provides, an antenna test device to test antenna efficiency. The test device includes a cavity formed by at least one conductive sidewall. The cavity contains at least one tuning probe, at least one movable portion, or a combination thereof. The tuning probes and/or movable portion help inhibit the antenna under test from having faulty measurements due to anti resonance or coupling.
    Type: Application
    Filed: June 18, 2004
    Publication date: December 22, 2005
    Inventors: Govind R. Kadambi, Ram Narayanan, Yeqin Huang, Gordon Evert, James Winter
  • Patent number: 6917335
    Abstract: An internal antenna for wireless devices comprising a ground plane and a planar loop antenna. The shorted loop antenna is provided with a gap and operates at a quarter wavelength. The compact single feed dual or multi band internal antenna is realized either through composite assembly of an active outer and inner radiating elements or by a selective combination of an active outer radiating element and a parasitic inner radiating element. The inner radiating element of the proposed invention is completely encompassed within the outer radiating element. The resonant tuning of the internal antenna is accomplished by means of the matching stub and capacitive loading plates with the matching stubs being entirely internal to the outer radiating element.
    Type: Grant
    Filed: July 16, 2003
    Date of Patent: July 12, 2005
    Assignee: Centurion Wireless Technologies, Inc.
    Inventors: Govind R. Kadambi, Ted S. Hebron, Willis R. Hardy, Sripathi Yarasi
  • Patent number: 6836246
    Abstract: A Planar Inverted-F Antenna (PIFA) comprising a radiating element, a ground plane located below the radiating element; a through hole located at a position corresponding to the radiating element, a power feeding connector pin at a position corresponding to the radiating element; a through hole at a position corresponding to the radiating element; a conductive shorting post (pin) located at a position corresponding to the radiating element; a right side vertical plane formed along the edge of the radiating element; a left side vertical plane formed along the other edge of the radiating element; a lower horizontal plane formed by bending the left side vertical plane; a slot on the radiating element; and a dielectric block located in the area between the lower horizontal plane and the ground.
    Type: Grant
    Filed: February 1, 2000
    Date of Patent: December 28, 2004
    Assignee: Centurion Wireless Technologies, Inc.
    Inventors: Govind R. Kadambi, Kenneth D. Simmons, Thomas F. Masek
  • Publication number: 20040178958
    Abstract: The present invention provides an internal antenna for wireless devices comprising a ground plane and a planar loop antenna. The shorted loop antenna is provided with a gap and operates at a quarter wavelength. The compact single feed dual or multi band internal antenna is realized either through composite assembly of an active outer and inner radiating elements or by a selective combination of an active outer radiating element and a parasitic inner radiating element. The inner radiating element of the proposed invention is completely encompassed within the outer radiating element. The resonant tuning of the internal antenna is accomplished by means of the matching stub and capacitive loading plates with the matching stubs being entirely internal to the outer radiating element.
    Type: Application
    Filed: July 16, 2003
    Publication date: September 16, 2004
    Inventors: Govind R. Kadambi, Ted S. Hebron, Willis R. Hardy, Sripathi Yarasi
  • Publication number: 20040070537
    Abstract: This invention presents new and alternative design techniques of single feed Dual/Tri ISM band PIFA for wireless system applications. To attain the advantages of and in accordance with the purpose of the present invention, dual and/or tri ISM band PIFA antennas are provided. In particular, an antenna comprises at least a ground plane, a radiating element, a short, and a feed tab. The short provides a connection between the ground plane and the radiating element. The feed tab connected to the radiating element provides RF power and provides initial impedance match. While the feed tab provides initial impedance match, additional impedance match and frequency control are obtained by the inclusion of one or more of a parasitic element, a slot, tuning stubs, and capacitive elements.
    Type: Application
    Filed: October 10, 2002
    Publication date: April 15, 2004
    Inventors: Govind R. Kadambi, Blaine R. Bateman, Michael G. Volkmer, Gary A. Cumro, Bradley S. Haussler
  • Patent number: 6714162
    Abstract: This invention presents new and alternative design techniques of single feed Dual/Tri ISM band PIFA for wireless system applications. To attain the advantages of and in accordance with the purpose of the present invention, dual and/or tri ISM band PIFA antennas are provided. In particular, an antenna comprises at least a ground plane, a radiating element, a short, and a feed tab. The short provides a connection between the ground plane and the radiating element. The feed tab connected to the radiating element provides RF power and provides initial impedance match. While the feed tab provides initial impedance match, additional impedance match and frequency control are obtained by the inclusion of one or more of a parasitic element, a slot, tuning stubs, and capacitive elements.
    Type: Grant
    Filed: October 10, 2002
    Date of Patent: March 30, 2004
    Assignee: Centurion Wireless Technologies, Inc.
    Inventors: Govind R. Kadambi, Blaine R. Bateman, Michael G. Volkmer, Gary A. Cumro, Bradley S. Haussler
  • Patent number: 6710748
    Abstract: The present invention relates to a non-rectangular shaped PIFA capable of dual ISM band operation using a single power feed. The dual frequency operation of the PIFA is accomplished by using a slot in the radiating element to quasi partition the radiating element. The dual band performance of the PIFA is realized through the integration of either the microstrip or the Co Planar Waveguide (CPW) feed line to the antenna structure.
    Type: Grant
    Filed: January 14, 2003
    Date of Patent: March 23, 2004
    Assignee: Centurion Wireless Technologies, Inc.
    Inventors: Sripathi Yarasi, Govind R. Kadambi, Theodore S. Hebron
  • Publication number: 20030231134
    Abstract: The present invention relates to a non-rectangular shaped PIFA capable of dual ISM band operation using a single power feed. The dual frequency operation of the PIFA is accomplished by using a slot in-the radiating element to quasi partition the radiating element. The dual band performance of the PIFA is realized through the integration of either the microstrip or the Co Planar Waveguide (CPW) feed line to the antenna structure.
    Type: Application
    Filed: January 14, 2003
    Publication date: December 18, 2003
    Inventors: Sripathi Yarasi, Govind R. Kadambi, Theodore S. Hebron
  • Publication number: 20030210188
    Abstract: A multi-band antenna including a retractable antenna and a meander antenna wherein the meander antenna may take several forms. In all of the embodiments, the meander antenna comprises first and second meander radiating elements. In one form of the invention, the closed ends of the loops of the second meander radiating element protrude into the open ends of the loops of the first meander radiating element. In other forms of the invention, active and/or passive elements are positioned between the first and second meander radiating elements. In some forms of the invention, the active or passive elements include stubs which protrude into the open ends of the loops of the first meander radiating element.
    Type: Application
    Filed: May 9, 2002
    Publication date: November 13, 2003
    Inventors: Ted Hebron, Willis R. Hardy, Govind R. Kadambi, Ying Dong Song
  • Patent number: 6642893
    Abstract: A multi-band antenna including a retractable antenna and a meander antenna wherein the meander antenna may take several forms. In all of the embodiments, the meander antenna comprises first and second meander radiating elements. In one form of the invention, the closed ends of the loops of the second meander radiating element protrude into the open ends of the loops of the first meander radiating element. In other forms of the invention, active and/or passive elements are positioned between the first and second meander radiating elements. In some forms of the invention, the active or passive elements include stubs which protrude into the open ends of the loops of the first meander radiating element.
    Type: Grant
    Filed: May 9, 2002
    Date of Patent: November 4, 2003
    Assignee: Centurion Wireless Technologies, Inc.
    Inventors: Ted Hebron, Willis R. Hardy, Govind R. Kadambi, Ying Dong Song
  • Publication number: 20030201943
    Abstract: A Planar Inverted F-Antenna (PIFA) comprising: a radiating element placed above a dielectric carriage with four side walls; a ground plane positioned below the dielectric carriage; a short circuiting element at the front edge of the radiating element; a feed tab at the front edge of the radiating element; vertical planes formed along the right and left edges of the radiating element forming capacitive loading plates; a first reactive loading slot formed in the radiating element between the short circuiting element and the left edge thereof; the open end of the first reactive loading slot being at the front edge of the radiating element; a second reactive loading slot formed in the radiating element between the feed tab and the right edge thereof; the open end of the second reactive loading slot being at the back edge of the radiating element; conductive stubs at the front and back edges of the radiating element for tuning lower and upper resonant frequencies; a conductive strip having a vertical attachment in
    Type: Application
    Filed: April 29, 2002
    Publication date: October 30, 2003
    Inventors: Govind R. Kadambi, Jon L. Sullivan
  • Patent number: 6639560
    Abstract: A Planar Inverted F-Antenna (PIFA) comprising: a radiating element placed above a dielectric carriage with four side walls; a ground plane positioned below the dielectric carriage; a short circuiting element at the front edge of the radiating element; a feed tab at the front edge of the radiating element; vertical planes formed along the right and left edges of the radiating element forming capacitive loading plates; a first reactive loading slot formed in the radiating element between the short circuiting element and the left edge thereof; the open end of the first reactive loading slot being at the front edge of the radiating element; a second reactive loading slot formed in the radiating element between the feed tab and the right edge thereof; the open end of the second reactive loading slot being at the back edge of the radiating element; conductive stubs at the front and back edges of the radiating element for tuning lower and upper resonant frequencies; a conductive strip having a vertical attachment in
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: October 28, 2003
    Assignee: Centurion Wireless Technologies, Inc.
    Inventors: Govind R. Kadambi, Jon L. Sullivan
  • Patent number: 6483463
    Abstract: A diversity antenna comprising two planar inverted F antennas (PIFAs) characterized by: two radiating elements with or without the physical separation between them; the spatially separable radiating elements of the two PIFAs with side-by-side or orthogonal placement with respect to each other are combined to form an equivalent single element consisting of the composite assembly of two radiators; a small ground plane of rectangular or L-shape with or without bending at its opposite ends is common to both the radiating elements; the radiating elements are placed above the unbent common ground plane; the radiating elements are placed above the vertical sections of the bent common ground plane; the shorted ends of the spatially separated radiating elements are placed back to back on the said common ground plane; a common shorting post placed along the common boundary line resulted by the merging of the two radiators with a prior side by side mutual placement; a common shorting post placed within the common bounda
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: November 19, 2002
    Assignee: Centurion Wireless Technologies, Inc.
    Inventors: Govind R. Kadambi, Kenneth D. Simmons, Sripathi Yarasi
  • Publication number: 20020140612
    Abstract: A diversity antenna comprising two planar inverted F antennas (PIFAs) characterized by: two radiating elements with or without the physical separation between them; the spatially separable radiating elements of the two PIFAs with side-by-side or orthogonal placement with respect to each other are combined to form an equivalent single element consisting of the composite assembly of two radiators; a small ground plane of rectangular or L-shape with or without bending at its opposite ends is common to both the radiating elements; the radiating elements are placed above the unbent common ground plane; the radiating elements are placed above the vertical sections of the bent common ground plane; the shorted ends of the spatially separated radiating elements are placed back to back on the said common ground plane; a common shorting post placed along the common boundary line resulted by the merging of the two radiators with a prior side by side mutual placement; a common shorting post placed within the common bounda
    Type: Application
    Filed: March 27, 2001
    Publication date: October 3, 2002
    Inventors: Govind R. Kadambi, Kenneth D. Simmons, Sripathi Yarasi
  • Patent number: 6433747
    Abstract: A Planar Inverted F Antenna (PIFA) is disclosed comprising a radiator assembly positioned in the interior of a lower Radome member. An upper Radome member is placed over the radiator assembly with the upper Radome member and the lower Radome member fully enclosing the radiator assembly. The radiator assembly is held to the upper and lower Radome members by means of three dielectric blocks on each member. The radiator assembly comprises: (1) two radiating elements placed on the opposite sides of common ground plane; (2) two separate shorting strips extending between one end of each radiating element and one end of common ground plane; (3) a common feed conductor in the form of a single strip connecting one edge of each radiating element and the common feed conductor which has a disc-shaped portion with an opening formed therein. A ground tab is formed as an extension of the common ground plane.
    Type: Grant
    Filed: June 8, 2001
    Date of Patent: August 13, 2002
    Assignee: Centurion Wireless Technologies, Inc.
    Inventors: Gary A. Cumro, Sripathi Yarasi, Govind R. Kadambi, Kenneth D. Simmons
  • Patent number: 6417809
    Abstract: A compact dual diversity antenna for RF data and wireless communication devices having a printed circuit board is disclosed. First and second PIFAs are mounted on the PCB in a spaced relationship. Each of the first and second PIFAs include radiating elements having ground planes and shorting posts. The ground plane of the second PIFA is disposed in the same plane as the PCB. The ground plane of the first PIFA is orthogonally disposed with respect to the ground plane of the second PIFA. First and second feed posts connect the first and second PIFAs to the PCB through RF feed lines. The first and second feed posts are disposed perpendicularly to one another.
    Type: Grant
    Filed: August 15, 2001
    Date of Patent: July 9, 2002
    Assignee: Centurion Wireless Technologies, Inc.
    Inventors: Govind R. Kadambi, Blaine Rexel Bateman, Ted Hebron, Gary A. Cumro, Scott Witt