Patents by Inventor Sridhar Kanamaluru
Sridhar Kanamaluru 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: 6965784Abstract: A compact lightweight antenna for receiving microwave direct line of sight wireless data signals used in services such as Local Multipoint Distribution Services (LMDS). The antenna provides for precise control over isolation of polarized signals. The antenna consists of an external parabolically shaped dome formed of a suitably resilient material such as thermoplastic. A polarizing conductive grating is formed on the interior surface of the dome and serves as a transreflector for initially passing received radiation having a vertical polarization. A twist reflector disposed at a point along an axis defined by the conductive grating reflects the received radiation, back in the direction of the transreflector with a different polarization. The now differently polarized energy is reflected by the parabolically shaped conductive grating at a feed point located in the center of the twist plate.Type: GrantFiled: February 21, 2002Date of Patent: November 15, 2005Assignee: YDI Wireless, Inc.Inventors: Sridhar Kanamaluru, Kenneth R. Wood
-
Patent number: 6727776Abstract: A device for efficient propagation of radio frequency (RF) signals, including concurrent transmission of signals of different polarizations, includes a waveguide having an input port for receiving electromagnetic radiation having a first polarized signal and a second polarized signal, the first and second polarized signals being orthogonal to one another. The waveguide includes first and second substrates mounted therein and positioned transverse to the longitudinal axis thereof. Both the first and second substrates are substantially transmissive of the electromagnetic radiation. The first substrate includes a probe formed thereon for transmitting or receiving the first polarized signal, and the second substrate includes a probe for transmitting or receiving a second polarized signal. A grid substrate is mounted in the waveguide between the first and second substrates and positioned transverse to the longitudinal axis thereof.Type: GrantFiled: February 7, 2002Date of Patent: April 27, 2004Assignee: Sarnoff CorporationInventor: Sridhar Kanamaluru
-
Patent number: 6621468Abstract: A radio frequency (RF) power distribution network includes a block assembly having integrated therein a network of waveguides and a plurality of waveguide power dividers. The block assembly has an input waveguide and N output waveguides. The waveguides and waveguide power dividers form a waveguide network for dividing the power of an RF signal present at the input waveguide among the N output waveguides. The RF distribution network can be adapted for use as a feed network for phased array antenna systems.Type: GrantFiled: March 26, 2001Date of Patent: September 16, 2003Assignee: Sarnoff CorporationInventor: Sridhar Kanamaluru
-
Patent number: 6597327Abstract: A reconfigurable adaptive wideband antenna includes a reconfigurable conductive substrate for dynamic reconfigurablility of the frequency, polarization, bandwidth, number of beams and their spatial directions, and the shape of the radiation pattern. The antenna is configured as a reflect array antenna having a single broadband feed. Reflective elements are electronically painted on the reconfigurable conductive surface using plasma injection of carriers in high-resistivity semiconductors.Type: GrantFiled: January 26, 2001Date of Patent: July 22, 2003Assignee: Sarnoff CorporationInventors: Sridhar Kanamaluru, Aly E. Fathy, Ayre Rosen
-
Patent number: 6567046Abstract: A reconfigurable antenna capable of dynamic reconfigurability of several antenna parameters. Specifically, the present invention is an antenna comprising a plurality of surface PIN devices arranged in a gridlike array. Each of the SPIN devices can be individually activated or deactivated. When a SPIN device is activated, the surface of the device is injected with carriers such that a plasma is produced within the intrinsic region of the device. The plasma can be sufficiently conductive to produce conductor or metal like characteristics at the surface of the device. Various ones of the SPIN devices can be activated to electronically paint a conductive pattern upon the substrate supporting the PIN devices. Through selective activation of the SPIN devices various surface antenna patterns can be produced upon the substrate including dipoles, cross dipoles, loop antennas, Yagi-Uda type antennas, log periodic antennas, and the like.Type: GrantFiled: March 20, 2001Date of Patent: May 20, 2003Assignee: Sarnoff CorporationInventors: Gordon C. Taylor, Stewart M. Perlow, Arye Rosen, Aly E. Fathy, Sridhar Kanamaluru, Moniem Esherbiny
-
Method and apparatus for delivering personalized and location sensitive information to a user device
Publication number: 20030068974Abstract: A method and system for delivering personalized, location-sensitive information to a user device comprising an information network interface for collecting, filtering and storing information and a broadcast network for delivering, as broadcast information, some or all of the collected information to a user device. The user device filters the broadcast information in accordance with a user's personal preferences and a user's location.Type: ApplicationFiled: April 3, 2001Publication date: April 10, 2003Applicant: Sarnoff CorporationInventors: Sridhar Kanamaluru, John Riganati, Zygmond Turski, Raymond Camisa -
Patent number: 6529166Abstract: An ultra-wideband, multi-beam adaptive antenna includes a phased array system having an ultra-wideband antenna. The antenna further includes at least two sub-arrays of antenna elements for receiving radio frequency (RF) signals located in a respective at least two sub-bands of a desired wide frequency band. The sub-arrays are interspersed to provide a single wideband antenna, which is coupled with a phased array system having multiple beamforming networks.Type: GrantFiled: March 27, 2001Date of Patent: March 4, 2003Assignee: Sarnoff CorporationInventor: Sridhar Kanamaluru
-
Method and apparatus for enhancing the data transmission capacity of a wireless communication system
Publication number: 20030017853Abstract: A method and apparatus for enhancing the data transmission capacity of a wireless communication system includes a smart antenna array for forming a radiation pattern to communicate with a plurality of mobile devices and control circuitry for adaptively modifying the radiation pattern to increase the carrier-to-interference (C/I) ratio of the wireless communication system.Type: ApplicationFiled: July 12, 2002Publication date: January 23, 2003Applicant: SARNOFF CORPORATIONInventors: Sridhar Kanamaluru, Zygmond Turski, Henry Owen -
Publication number: 20020173342Abstract: A compact lightweight antenna for receiving microwave direct line of sight wireless data signals used in services such as Local Multipoint Distribution Services (LMDS). The antenna provides for precise control over isolation of polarized signals. The antenna consists of an external parabolically shaped dome formed of a suitably resilient material such as thermoplastic. A polarizing conductive grating is formed on the interior surface of the dome and serves as a transreflector for initially passing received radiation having a vertical polarization. A twist reflector disposed at a point along an axis defined by the conductive grating reflects the received radiation, back in the direction of the transreflector with a different polarization. The now differently polarized energy is reflected by the parabolically shaped conductive grating at a feed point located in the center of the twist plate.Type: ApplicationFiled: February 21, 2002Publication date: November 21, 2002Applicant: Telaxis Communications CorporationInventors: Sridhar Kanamaluru, Kenneth R. Wood
-
Publication number: 20020140616Abstract: An ultra-wideband, multi-beam adaptive antenna includes a phased array system having an ultra-wideband antenna. The antenna further includes at least two sub-arrays of antenna elements for receiving radio frequency (RF) signals located in a respective at least two sub-bands of a desired wide frequency band. The sub-arrays are interspersed to provide a single wideband antenna, which is coupled with a phased array system having multiple beamforming networks.Type: ApplicationFiled: March 27, 2001Publication date: October 3, 2002Inventor: Sridhar Kanamaluru
-
Publication number: 20020135526Abstract: A radio frequency (RF) power distribution network includes a block assembly having integrated therein a network of waveguides and a plurality of waveguide power dividers. The block assembly has an input waveguide and N output waveguides. The waveguides and waveguide power dividers form a waveguide network for dividing the power of an RF signal present at the input waveguide among the N output waveguides. The RF distribution network can be adapted for use as a feed network for phased array antenna systems.Type: ApplicationFiled: March 26, 2001Publication date: September 26, 2002Applicant: Sarnoff CorporationInventor: Sridhar Kanamaluru
-
Publication number: 20020109558Abstract: A device for efficient propagation of radio frequency (RF) signals, including concurrent transmission of signals of different polarizations, includes a waveguide having an input port for receiving electromagnetic radiation having a first polarized signal and a second polarized signal, the first and second polarized signals being orthogonal to one another. The waveguide includes first and second substrates mounted therein and positioned transverse to the longitudinal axis thereof. Both the first and second substrates are substantially transmissive of the electromagnetic radiation. The first substrate includes a probe formed thereon for transmitting or receiving the first polarized signal, and the second substrate includes a probe for transmitting or receiving a second polarized signal. A grid substrate is mounted in the waveguide between the first and second substrates and positioned transverse to the longitudinal axis thereof.Type: ApplicationFiled: February 7, 2002Publication date: August 15, 2002Applicant: Sarnoff CorporationInventor: Sridhar Kanamaluru
-
Publication number: 20020101391Abstract: A reconfigurable adaptive wideband antenna includes a reconfigurable conductive substrate for dynamic reconfigurablility of the frequency, polarization, bandwidth, number of beams and their spatial directions, and the shape of the radiation pattern. The antenna is configured as a reflect array antenna having a single broadband feed. Reflective elements are electronically painted on the reconfigurable conductive surface using plasma injection of carriers in high-resistivity semiconductors.Type: ApplicationFiled: January 26, 2001Publication date: August 1, 2002Applicant: Sarnoff CorporationInventors: Sridhar Kanamaluru, Aly E. Fathy, Ayre Rosen
-
Patent number: 6370398Abstract: A compact lightweight antenna for receiving microwave direct line of sight wireless data signals used in services such as Local Multipoint Distribution Services (LMDS). The antenna provides for precise control over isolation of polarized signals. The antenna consists of an external parabolically shaped dome formed of a suitably resilient material such as thermoplastic. A polarizing metal grid is formed on the interior surface of the dome and serves as a transreflector for initially passing received radiation having a vertical polarization. A twist reflector disposed at a point along an axis defined by the metal grid reflects the received radiation, back in the direction of the transreflector with a different polarization. The now differently polarized energy is reflected by the parabolically shaped metal grid at a feed point located in the center of the twist plate. Operation for transmitting energy is analogous.Type: GrantFiled: May 24, 1999Date of Patent: April 9, 2002Assignee: Telaxis Communications CorporationInventors: Sridhar Kanamaluru, Kenneth R. Wood
-
Publication number: 20020039083Abstract: A reconfigurable antenna capable of dynamic reconfigurability of several antenna parameters. Specifically, the present invention is an antenna comprising a plurality of surface PIN devices arranged in a gridlike array. Each of the SPIN devices can be individually activated or deactivated. When a SPIN device is activated, the surface of the device is injected with carriers such that a plasma is produced within the intrinsic region of the device. The plasma can be sufficiently conductive to produce conductor or metal like characteristics at the surface of the device. Various ones of the SPIN devices can be activated to electronically paint a conductive pattern upon the substrate supporting the PIN devices. Through selective activation of the SPIN devices various surface antenna patterns can be produced upon the substrate including dipoles, cross dipoles, loop antennas, Yagi-Uda type antennas, log periodic antennas, and the like.Type: ApplicationFiled: March 20, 2001Publication date: April 4, 2002Inventors: Gordon C. Taylor, Stewart M. Perlow, Arye Rosen, Aly E. Fathy, Sridhar Kanamaluru, Moniem Elsherbiny