Patents by Inventor Arun Bhattacharyya
Arun Bhattacharyya 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: 20240147318Abstract: Aspects relate to roaming using multi-link communication. In some examples, a wireless station communicating with a first access point via a multi-link connection, using a first link and at least one other link, may identify a failure condition associated with the at least one other link. In this case, the wireless station may use one of the links to verify a connection to a second access point, while maintaining connectivity with the first access point via the first link Once connectivity to the second access point is verified, the wireless station may switch its multi-link connection to the second access point.Type: ApplicationFiled: October 26, 2022Publication date: May 2, 2024Inventors: Arun Kumar KHANDAVALLI, Kamal Teja BATTA, Santhi Swaroop GOLTI, Tushnim BHATTACHARYYA, Ganesh Babu KUMARAVEL
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Publication number: 20080106482Abstract: A low-profile, electronically scanned antenna that can scan a hemisphere is comprised of three, phased array radiators. Each radiator face has an azimuth and elevation scan angle equal to 120 degrees. The three radiator faces are arranged in a truncated 3 sided pyramid such that they prove continuous hemispherical coverage. The three radiators are mounted to cooled panels of a truncated pyramid-shaped frame such that the radiators enable a full hemisphere to be scanned by radar.Type: ApplicationFiled: November 8, 2006Publication date: May 8, 2008Inventors: Alan Cherrette, Carl Wise, Arun Bhattacharyya, Michael Wrobleski, Allan Goetz
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Patent number: 7242904Abstract: A dual-band multiple beam antenna system for a communications satellite sharing a set of reflector antennas for the transmit and receive frequencies. One set of reflectors is common to both the downlink and uplink frequencies. The feed horns are diplexed and exhibit frequency-dependent radiation patterns that separate the phase centers over the downlink and uplink frequency bands to obtain dual-band performance. The focal point of the reflector is in close proximity to the phase center corresponding to the downlink frequency band. The phase center for the uplink frequency band is spaced a predetermined distance from the phase center of the downlink frequency band. According to the present invention, the uplink frequencies are defocused and the downlink frequencies are focused thereby creating identical radiation patterns at both frequency bands and over the coverage region of the communications satellite.Type: GrantFiled: October 27, 2005Date of Patent: July 10, 2007Assignee: The Boeing CompanyInventors: Sudhakar K. Rao, David Bressler, Arun Bhattacharyya
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Patent number: 7110716Abstract: A dual-band multiple beam antenna system for a communications satellite sharing a set of reflector antennas for the transmit and receive frequencies. One set of reflectors is common to both the downlink and uplink frequencies. The feed horns are diplexed and exhibit frequency-dependent radiation patterns that separate the phase centers over the downlink and uplink frequency bands to obtain dual-band performance. The focal point of the reflector is in close proximity to the phase center corresponding to the downlink frequency band. The phase center for the uplink frequency band is spaced a predetermined distance from the phase center of the downlink frequency band. According to the present invention, the uplink frequencies are defocused and the downlink frequencies are focused thereby creating identical radiation patterns at both frequency bands and over the coverage region of the communications satellite.Type: GrantFiled: January 30, 2002Date of Patent: September 19, 2006Assignee: The Boeing CompanyInventors: Sudhakar K. Rao, David Bressler, Arun Bhattacharyya
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Publication number: 20060119528Abstract: An antenna horn having multiple flared sections with their slopes and lengths selected to enhance desirable electromagnetic modes and to suppress undesirable modes at the horn aperture, thereby increasing the aperture efficiency and antenna gain.Type: ApplicationFiled: December 3, 2004Publication date: June 8, 2006Inventors: Arun Bhattacharyya, James Sor
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Patent number: 7053847Abstract: A phased array antenna structure capable of operation at millimeter-wave frequencies and having multiple ring slot radiator elements (10). The RF feed structure for each radiator element includes a feed via (28) extending part-way through a multi-layer structure (FIG. 3) on which the radiator elements (10) are formed and a strip line feed probe (30) extending from the via (28) toward the radiator element. A key feature facilitating high-frequency operation is the inclusion of multiple mode suppressors (32) surrounding the via (28) and providing a smooth transition from a coaxial mode of RF transmission to a strip line mode of RF transmission. The feed probe (30) is tailored to provide either a narrow-band or a wideband frequency characteristic.Type: GrantFiled: August 11, 2004Date of Patent: May 30, 2006Assignee: Northrop Grumman CorporationInventors: Steven S. Chan, Te Kao Wu, Arun Bhattacharyya, Juan Rivera, Phillip L. Metzen
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Publication number: 20060063528Abstract: A dual-band multiple beam antenna system for a communications satellite sharing a set of reflector antennas for the transmit and receive frequencies. One set of reflectors is common to both the downlink and uplink frequencies. The feed horns are diplexed and exhibit frequency-dependent radiation patterns that separate the phase centers over the downlink and uplink frequency bands to obtain dual-band performance. The focal point of the reflector is in close proximity to the phase center corresponding to the downlink frequency band. The phase center for the uplink frequency band is spaced a predetermined distance from the phase center of the downlink frequency band. According to the present invention, the uplink frequencies are defocused and the downlink frequencies are focused thereby creating identical radiation patterns at both frequency bands and over the coverage region of the communications satellite.Type: ApplicationFiled: October 27, 2005Publication date: March 23, 2006Inventors: Sudhakar Rao, David Bressler, Arun Bhattacharyya
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Publication number: 20060033671Abstract: A phased array antenna structure capable of operation at millimeter-wave frequencies and having multiple ring slot radiator elements (10). The RF feed structure for each radiator element includes a feed via (28) extending part-way through a multi-layer structure (FIG. 3) on which the radiator elements (10) are formed and a strip line feed probe (30) extending from the via (28) toward the radiator element. A key feature facilitating high-frequency operation is the inclusion of multiple mode suppressors (32) surrounding the via (28) and providing a smooth transition from a coaxial mode of RF transmission to a strip line mode of RF transmission. The feed probe (30) is tailored to provide either a narrow-band or a wideband frequency characteristic.Type: ApplicationFiled: August 11, 2004Publication date: February 16, 2006Inventors: Steven Chan, Te Wu, Arun Bhattacharyya, Juan Rivera, Phillip Metzen
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Patent number: 6967627Abstract: A multiple mode feed horn is provided for transmitting and receiving signals. The feed horn includes a transverse electric throat section, a transverse electric profile section, and a transverse electric aperture section. The transverse electric profile section propagates a first transverse electric (TE) mode. The transverse electric aperture section propagates a second TE mode. The multiple mode feed horn prevents propagation of traverse magnetic modes from said throat section to said aperture section.Type: GrantFiled: October 1, 2003Date of Patent: November 22, 2005Assignee: The Boeing CompanyInventors: Arun Bhattacharyya, Daniel H. Roper
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Publication number: 20040070546Abstract: A multiple mode feed horn is provided for transmitting and receiving signals. The feed horn includes a transverse electric throat section, a transverse electric profile section, and a transverse electric aperture section. The transverse electric profile section propagates a first transverse electric (TE) mode. The transverse electric aperture section propagates a second TE mode. The multiple mode feed horn prevents propagation of traverse magnetic modes from said throat section to said aperture section.Type: ApplicationFiled: October 1, 2003Publication date: April 15, 2004Inventors: Arun Bhattacharyya, Daniel H. Roper
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Patent number: 6642900Abstract: A multiple mode feed horn is provided for transmitting and receiving signals. The feed horn includes a transverse electric throat section, a transverse electric profile section, and a transverse electric aperture section. The transverse electric profile section propagates a first transverse electric (TE) mode. The transverse electric aperture section propagates a second TE mode. The multiple mode feed horn prevents propagation of traverse magnetic modes from said throat section to said aperture section.Type: GrantFiled: September 21, 2001Date of Patent: November 4, 2003Assignee: The Boeing CompanyInventors: Arun Bhattacharyya, Daniel H. Roper
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Publication number: 20030142014Abstract: A dual-band multiple beam antenna system for a communications satellite sharing a set of reflector antennas for the transmit and receive frequencies. One set of reflectors is common to both the downlink and uplink frequencies. The feed horns are diplexed and exhibit frequency-dependent radiation patterns that separate the phase centers over the downlink and uplink frequency bands to obtain dual-band performance. The focal point of the reflector is in close proximity to the phase center corresponding to the downlink frequency band. The phase center for the uplink frequency band is spaced a predetermined distance from the phase center of the downlink frequency band. According to the present invention, the uplink frequencies are defocused and the downlink frequencies are focused thereby creating identical radiation patterns at both frequency bands and over the coverage region of the communications satellite.Type: ApplicationFiled: January 30, 2002Publication date: July 31, 2003Inventors: Sudhakar K. Rao, David Bressler, Arun Bhattacharyya
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Patent number: 6549166Abstract: A patch antenna is disclosed having four ports for circular polarization that suppress the TM-02 mode, resulting in a radiation pattern that is symmetric. The axial ratio performance is consequently superior to that of two-port patch antennas. A four-port patch antenna includes a patch made of an electrically conductive material, a patch substrate coupled to the patch wherein the patch substrate is made of a dielectric material, a ground plane coupled to the patch substrate wherein the ground plane is made of an electrically conductive material having at least four slots formed therein, a feed substrate coupled to the ground plane wherein the feed substrate is made of a dielectric material, and a hybrid network coupled to the feed substrate that includes a right hand circularly polarized port, a left hand circularly polarized port, and two matched terminated ports.Type: GrantFiled: August 22, 2001Date of Patent: April 15, 2003Assignee: The Boeing CompanyInventors: Arun Bhattacharyya, Alan Cha, James McKay
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Publication number: 20030058182Abstract: A multiple mode feed horn is provided for transmitting and receiving signals. The feed horn includes a transverse electric throat section, a transverse electric profile section, and a transverse electric aperture section. The transverse electric profile section propagates a first transverse electric (TE) mode. The transverse electric aperture section propagates a second TE mode. The multiple mode feed horn prevents propagation of traverse magnetic modes from said throat section to said aperture section.Type: ApplicationFiled: September 21, 2001Publication date: March 27, 2003Inventors: Arun Bhattacharyya, Daniel Roper
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Patent number: 6535174Abstract: An antenna apparatus that has an increased efficiency, and a method for increasing the efficiency of multi-mode antenna feed horns, is disclosed. The method comprises the steps of exciting, within the antenna, a desired transmission mode and an undesired transmission mode of the signal to be transmitted, and converting, within the antenna, power within the undesired transmission mode into power for the desired transmission mode of the signal to be transmitted. An antenna apparatus in accordance with the present invention comprises a feed horn having an input opening, an aperture, and a cavity, disposed between the input opening and the aperture, for suppressing an undesired transmission mode of the antenna and exciting a desired transmission mode of the antenna.Type: GrantFiled: December 20, 1999Date of Patent: March 18, 2003Assignee: Hughes Electronics CorporationInventors: Sudhakar Rao, Arun Bhattacharyya
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Publication number: 20030043074Abstract: A patch antenna is disclosed having four ports for circular polarization that suppress the TM-02 mode, resulting in a radiation pattern that is symmetric. The axial ratio performance is consequently superior to that of two-port patch antennas. A four-port patch antenna includes a patch made of an electrically conductive material, a patch substrate coupled to the patch wherein the patch substrate is made of a dielectric material, a ground plane coupled to the patch substrate wherein the ground plane is made of an electrically conductive material having at least four slots formed therein, a feed substrate coupled to the ground plane wherein the feed substrate is made of a dielectric material, and a hybrid network coupled to the feed substrate that includes a right hand circularly polarized port, a left hand circularly polarized port, and two matched terminated ports.Type: ApplicationFiled: August 22, 2001Publication date: March 6, 2003Inventors: Arun Bhattacharyya, Alan Cha, James McKay
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Patent number: 6424299Abstract: A dual-band patch antenna element (10) for circular or linear polarization. The patch element (10) is excited by two different hybrids (22, 24), designed for transmit and receive bands respectively. Each hybrid (22, 24) electromagnetically couples a pair of orthogonal ground plane slots (26, 28, 30, 32) that excite the patch antenna (10). The hybrid (22) and slot (26, 28) dimensions for the transmit band are different from the hybrid (24) and slot (30, 32) dimensions for the receive band. Isolation can be improved by connecting shunt stubs (34, 36) to the hybrids (22, 24).Type: GrantFiled: August 9, 2001Date of Patent: July 23, 2002Assignee: The Boeing CompanyInventors: Alan Cha, Arun Bhattacharyya
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Patent number: 6388620Abstract: An antenna element, an antenna system, and a method for producing a signal using slot-coupled antenna elements are disclosed. The antenna element comprises an electrically conductive strip, a patch element, overlaying the electrically conductive strip, and a ground plane. The ground plane is coupled between the patch element and the electrically conductive strip and comprises an opening, at least a portion of the opening overlapping with at least a portion of the electrically conductive strip, wherein the opening and the electrically conductive strip can reflect incident radio frequency (RF) energy in a desired radiation pattern.Type: GrantFiled: June 13, 2000Date of Patent: May 14, 2002Assignee: Hughes Electronics CorporationInventor: Arun Bhattacharyya
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Publication number: 20010052881Abstract: An antenna apparatus that has an increased efficiency, and a method for increasing the efficiency of multi-mode antenna feed horns, is disclosed. The method comprises the steps of exciting, within the antenna, a desired transmission mode and an undesired transmission mode of the signal to be transmitted, and converting, within the antenna, power within the undesired transmission mode into power for the desired transmission mode of the signal to be transmitted. An antenna apparatus in accordance with the present invention comprises a feed horn having an input opening, an aperture, and a cavity, disposed between the input opening and the aperture, for suppressing an undesired transmission mode of the antenna and exciting a desired transmission mode of the antenna.Type: ApplicationFiled: December 20, 1999Publication date: December 20, 2001Inventors: SUDHAKAR RAO, ARUN BHATTACHARYYA