Patents by Inventor Parthasarathy Ramanujam
Parthasarathy Ramanujam 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).
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Publication number: 20230198166Abstract: A user terminal includes a reconfigurable phased array antenna having a plurality of antenna elements. The user terminal is operable for: broadening a field of regard of the reconfigurable phased array antenna; receiving signals from a plurality of satellites within the field of regard using the reconfigurable phased array antenna; determining one or more attributes of the received signals for each of the satellites; and selecting one of the plurality of satellites for communication based on the attributes of the received signals. After the satellite has been selected, the user terminal is configured for: switching to a directional mode for the reconfigurable phased array antenna; establishing the communication with the selected satellite using the reconfigurable phased array antenna; and tracking the selected satellite. Ephemeris data broadcast by the satellites is used by the user terminal to track the satellites and to perform handovers between satellites.Type: ApplicationFiled: February 13, 2023Publication date: June 22, 2023Applicant: The Boeing CompanyInventors: Ying J. Feria, David Whelan, Parthasarathy Ramanujam
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System and method for wireless communications using an adaptable diamond phased array antenna system
Patent number: 10128570Abstract: An antenna system includes an array of radiating elements forming a diamond shape. The diamond shape includes a first axis and a second axis. The diamond shape is oriented with the first axis aligned with a reference plane shared by a plurality of airborne communications relay platforms. The diamond shape is reoriented to maintain the first axis aligned with the reference plane in response to a change in position of the reference plane relative to the array.Type: GrantFiled: October 13, 2016Date of Patent: November 13, 2018Assignee: The Boeing CompanyInventors: David A. Whelan, Ying J. Feria, Parthasarathy Ramanujam -
Patent number: 10122085Abstract: Systems, methods, and apparatus for re-pointing at least one beam are disclosed. In one or more embodiments, the disclosed method involves receiving and/or transmitting, with at least one feed, electromagnetic (EM) energy towards a non-parabolic reflector. In at least one embodiment, reflected EM energy that is reflected from the non-parabolic reflector originates from and/or generates at least one beam. The method further involves rotating, at least one feed, from at least one first angular position to at least one second angular position, such that at least one beam shifts from at least one first coverage location to at least one second coverage location.Type: GrantFiled: December 15, 2014Date of Patent: November 6, 2018Assignee: The Boeing CompanyInventors: Guy Goyette, Parthasarathy Ramanujam, Daniel F. Mathews
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Publication number: 20180164441Abstract: A user terminal includes a reconfigurable phased array antenna having a plurality of antenna elements. The user terminal is operable for: broadening a field of regard of the reconfigurable phased array antenna; receiving signals from a plurality of satellites within the field of regard using the reconfigurable phased array antenna; determining one or more attributes of the received signals for each of the satellites; and selecting one of the plurality of satellites for communication based on the attributes of the received signals. After the satellite has been selected, the user terminal is configured for: switching to a directional mode for the reconfigurable phased array antenna; establishing the communication with the selected satellite using the reconfigurable phased array antenna; and tracking the selected satellite. Ephemeris data broadcast by the satellites is used by the user terminal to track the satellites and to perform handovers between satellites.Type: ApplicationFiled: December 12, 2016Publication date: June 14, 2018Applicant: The Boeing CompanyInventors: Ying J. Feria, David Whelan, Parthasarathy Ramanujam
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System and Method for Wireless Communications Using an Adaptable Diamond Phased Array Antenna System
Publication number: 20180108986Abstract: An antenna system includes an array of radiating elements forming a diamond shape. The diamond shape includes a first axis and a second axis. The diamond shape is oriented with the first axis aligned with a reference plane shared by a plurality of airborne communications relay platforms. The diamond shape is reoriented to maintain the first axis aligned with the reference plane in response to a change in position of the reference plane relative to the array.Type: ApplicationFiled: October 13, 2016Publication date: April 19, 2018Inventors: David A. Whelan, Ying J. Feria, Parthasarathy Ramanujam -
Patent number: 9537212Abstract: An antenna array system for directing and steering an antenna beam is described in accordance with the present invention. The antenna array system may include a feed waveguide having a feed waveguide length, at least two directional couplers in signal communication with the feed waveguide, at least two pairs of planar coupling slots along the feed waveguide length, and at least two horn antennas.Type: GrantFiled: February 14, 2014Date of Patent: January 3, 2017Assignee: THE BOEING COMPANYInventors: Harold A. Rosen, Paul J. Tatomir, Parthasarathy Ramanujam, Sasha J. Courtade, Joshua Maxwell Rutheiser
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Publication number: 20160172756Abstract: Systems, methods, and apparatus for re-pointing at least one beam are disclosed. In one or more embodiments, the disclosed method involves receiving and/or transmitting, with at least one feed, electromagnetic (EM) energy towards a non-parabolic reflector. In at least one embodiment, reflected EM energy that is reflected from the non-parabolic reflector originates from and/or generates at least one beam. The method further involves rotating, at least one feed, from at least one first angular position to at least one second angular position, such that at least one beam shifts from at least one first coverage location to at least one second coverage location.Type: ApplicationFiled: December 15, 2014Publication date: June 16, 2016Inventors: Guy Goyette, Parthasarathy Ramanujam, Daniel F. Mathews
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Publication number: 20150236414Abstract: An antenna array system for directing and steering an antenna beam is described in accordance with the present invention. The antenna array system may include a feed waveguide having a feed waveguide length, at least two directional couplers in signal communication with the feed waveguide, at least two pairs of planar coupling slots along the feed waveguide length, and at least two horn antennas.Type: ApplicationFiled: February 14, 2014Publication date: August 20, 2015Applicant: The Boeing CompanyInventors: Harold A. Rosen, Paul J. Tatomir, Parthasarathy Ramanujam, Sasha J. Courtade, Joshua Maxwell Rutheiser
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Patent number: 8552917Abstract: A method and system are disclosed for wide angle multibeam antennas. The method and system involve a multibeam antenna system for generating high performance multiple spot beams. In one or more embodiments, the multibeam antenna system includes an oversized antenna reflector and a plurality of antenna feeds. The oversized antenna reflector has its surface shape optimized from a normal parabolic shape in order to broaden and shape the reflected spot beams to improve antenna performance. In addition, the diameter of the oversized antenna reflector is greater than ((100*?)/?), where ? is the wavelength in inches and ? is the beam to beam spacing in degrees. In some embodiments, the ratio of the focal length of the oversized antenna reflector to the diameter of the oversized antenna reflector (F/D) is greater than 0.7. In at least one embodiment, the system further includes an antenna sub-reflector.Type: GrantFiled: April 28, 2010Date of Patent: October 8, 2013Assignee: The Boeing CompanyInventors: Daniel F. Mathews, Parthasarathy Ramanujam, Robert B. Mathews, Thomas M. Hikido, Louis R. Fermelia, Gary J. Gawlas
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Patent number: 8103270Abstract: A communication system has a high altitude communication device that has an antenna for directing beams to a fixed cell pattern with a polarity of cells. A specific pattern of cells having the same communication resource is provided. Cells having the same resource may be separated. The antenna is shaped to suppress interference with locations having the same resource. The areas not having the same resource are not suppressed to allow the system to have maximum capacity and allow a smaller antenna aperture.Type: GrantFiled: March 11, 2008Date of Patent: January 24, 2012Assignee: The DIRECTV Group, Inc.Inventors: Harold Rosen, Ying Feria, Parthasarathy Ramanujam
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Publication number: 20110267251Abstract: A method and system are disclosed for wide angle multibeam antennas. The method and system involve a multibeam antenna system for generating high performance multiple spot beams. In one or more embodiments, the multibeam antenna system includes an oversized antenna reflector and a plurality of antenna feeds. The oversized antenna reflector has its surface shape optimized from a normal parabolic shape in order to broaden and shape the reflected spot beams to improve antenna performance. In addition, the diameter of the oversized antenna reflector is greater than ((100*?)/?), where ? is the wavelength in inches and ? is the beam to beam spacing in degrees. In some embodiments, the ratio of the focal length of the oversized antenna reflector to the diameter of the oversized antenna reflector (F/D) is greater than 0.7. In at least one embodiment, the system further includes an antenna sub-reflector.Type: ApplicationFiled: April 28, 2010Publication date: November 3, 2011Applicant: THE BOEING COMPANYInventors: Daniel F. Mathews, Parthasarathy Ramanujam, Robert B. Mathews, Thomas M. Hikido, Louis R. Fermelia, Gary J. Gawlas
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Publication number: 20080153481Abstract: A communication system has a high altitude communication device that has an antenna for directing beams to a fixed cell pattern with a polarity of cells. A specific pattern of cells having the same communication resource is provided. Cells having the same resource may be separated. The antenna is shaped to suppress interference with locations having the same resource. The areas not having the same resource are not suppressed to allow the system to have maximum capacity and allow a smaller antenna aperture.Type: ApplicationFiled: March 11, 2008Publication date: June 26, 2008Inventors: Harold Rosen, Ying Feria, Parthasarathy Ramanujam
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Patent number: 7369847Abstract: A communication system has a high altitude communication device that has an antenna for directing beams to a fixed cell pattern with a polarity of cells. A specific pattern of cells having the same communication resource is provided. Preferably, cells having the same resource are separated. The antenna is shaped to suppress interference with locations having the same resource. The areas not having the same resource are not suppressed to allow the system to have maximum capacity and allow a smaller antenna aperture.Type: GrantFiled: September 14, 2000Date of Patent: May 6, 2008Assignee: The DIRECTV Group, Inc.Inventors: Harold Rosen, Ying Feria, Parthasarathy Ramanujam
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Patent number: 6795034Abstract: A method and system for shaped beam and multiple frequency use having a shaped main reflector, two feeds having separate and distinct frequency bands, a first shaped sub-reflector having a frequency selective surface and a second shaped sub-reflector. The first shaped sub-reflector has the electrical property of reflecting one frequency band and passing another. A second desired frequency band from the second feed passes through the tuned FSS surface of the first sub-reflector and reflects off the second sub-reflector towards the main reflector.Type: GrantFiled: July 10, 2002Date of Patent: September 21, 2004Assignee: The Boeing CompanyInventors: Albert E. Lyerly, Parthasarathy Ramanujam
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Patent number: 6781555Abstract: A communication system and method for reconfigurably transmitting and receiving signals via a multi-beam reflector antenna array are disclosed. The multi-beam antenna system comprises a plurality of rings of single beam reflectors, each reflector having its own feed, wherein the plurality of rings are substantially concentric or nested and disposed on separate planes such that the reflectors of adjacent rings are substantially interleaved. The method, in one embodiment, comprises generating beams from a first, second and third ring of single beam feeds, respectively reflecting each beam from the first, second and third ring of single beam feeds on a separate reflector to a substantially separate coverage area, wherein the first, second and third rings are substantially concentric and disposed on separate planes such that the reflectors of adjacent rings are substantially interleaved.Type: GrantFiled: March 5, 2002Date of Patent: August 24, 2004Assignee: The DIRECTV Group, Inc.Inventors: Parthasarathy Ramanujam, Harold A. Rosen, Mark T. Austin, William D. Beightol
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Publication number: 20040008148Abstract: A method and system for shaped beam and multiple frequency use having a shaped main reflector, two feeds having separate and distinct frequency bands, a first shaped sub-reflector having a frequency selective surface and a second shaped sub-reflector. The first shaped sub-reflector has the electrical property of reflecting one frequency band and passing another. A second desired frequency band from the second feed passes through the tuned FSS surface of the first sub-reflector and reflects off the second sub-reflector towards the main reflector.Type: ApplicationFiled: July 10, 2002Publication date: January 15, 2004Inventors: Albert E. Lyerly, Parthasarathy Ramanujam
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Patent number: 6628238Abstract: An antenna includes a feed generating a communication signal. A sub-reflector is positioned to reflect the communication's signal to form a sub-reflective signal. A main reflector is positioned to reflect the sub-reflective signal. The sub-reflector has an elliptical rim.Type: GrantFiled: November 19, 2001Date of Patent: September 30, 2003Inventors: Parthasarathy Ramanujam, Albert E. Lyerly, Brian M. Park, Hussain Haddad, Laurston C. Wah
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Patent number: 6621461Abstract: A method for broadcasting, a signal, and an antenna system are disclosed. The antenna system comprises a feed horn and a reflector. The feed horn provides a radio frequency (RF) signal. The reflector is aligned with the feed horn and is illuminated by the feed horn, and comprises a reflective grid. The reflective grid lines are substantially parallel as viewed from a geographic location of a desired output beam from the antenna system. A method in accordance with the present invention comprises illuminating a reflector with an RF signal emanating from a feed horn, the feed horn being substantially located at a focal point of the reflector, wherein the reflector comprises a reflective grid, and reflecting the RF signal with the reflective grid, wherein lines of the reflective grid are substantially parallel as viewed from a geographic location of a desired output beam from the antenna system.Type: GrantFiled: August 9, 2000Date of Patent: September 16, 2003Assignee: Hughes Electronics CorporationInventors: Parthasarathy Ramanujam, Brian M. Park, Paul E. Guillaume, Cameron Massey
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Publication number: 20030095075Abstract: An antenna includes a feed generating a communication signal. A sub-reflector is positioned to reflect the communication's signal to form a sub-reflective signal. A main reflector is positioned to reflect the sub-reflective signal. The sub-reflector has an elliptical rim.Type: ApplicationFiled: November 19, 2001Publication date: May 22, 2003Inventors: Parthasarathy Ramanujam, Albert E. Lyerly, Brian M. Park, Hussain Haddad, Laurston C. Wah
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Patent number: 6438354Abstract: A reconfigurable payload for a satellite having a flexible antenna system, a variable downconverter technology and a filter technology that all work in combination to allow the payload of a satellite to be reconfigured in orbit.Type: GrantFiled: December 23, 1998Date of Patent: August 20, 2002Assignee: Hughes Electronics CorporationInventors: James D. Thompson, Parthasarathy Ramanujam, Cynthia A. Dixon, Debbie H. Feuerborn, David R. Goldberg, Stephen F. Sichi, Lomash J. Shah, John R. Dunwoody