Patents by Inventor Kamal Sarabandi
Kamal Sarabandi 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: 20070285332Abstract: A dual-slot coupled sectorial loop antenna (CSLA). The dual-slot CSLA includes a metalized layer deposited on a dielectric substrate. Portions of the metalized layer are removed to define two pie-slice shaped sectors that are electrically isolated from the remaining portion of the metalized layer, where points of the pie-slice shaped sectors oppose each other and are electrically coupled to a common feed.Type: ApplicationFiled: August 7, 2007Publication date: December 13, 2007Applicant: EMAG Technologies, Inc.Inventors: Kamal Sarabandi, Nader Behdad
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Publication number: 20070285330Abstract: A sectorial loop antenna structure that employs a plurality of pie-slice shaped sectors where adjacent sectors are coupled together by an arch and points of the sectors are coupled to a common feed. In one embodiment, the antenna structure includes a first sectorial loop antenna having two pie-slice shaped sectors and an arch therebetween, and a second sectorial loop antenna having two pie-slice shaped sectors and an arch therebetween. In another embodiment, the antenna structure includes a first pie-slice shaped sector and a second pie-slice shaped sector having an arch therebetween.Type: ApplicationFiled: August 7, 2007Publication date: December 13, 2007Applicant: EMAG Technologies, Inc.Inventors: Kamal Sarabandi, Nader Behdad
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Publication number: 20070279296Abstract: A wide-band double-loop antenna. The antenna includes a metal trace deposited on a dielectric substrate. The metal trace includes a plurality of trace legs and a cross-bar trace that define an E-shape. Two of the legs are electrically coupled to a ground plane, and the third leg is electrically coupled to a feed, such as a center conductor of a coaxial connector. An outer conductor of the connector is electrically coupled to the ground plane.Type: ApplicationFiled: August 7, 2007Publication date: December 6, 2007Applicant: EMAG Technologies, Inc.Inventors: Kamal Sarabandi, Nader Behdad
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Patent number: 7268741Abstract: A single-element antenna system that provides a wide bandwidth and consistent polarization over the frequency range to which the antenna is impedance matched. In one embodiment, the wideband antenna system includes two parallel coupled sectorial loop antennas (CSLA) that are coupled along an axis of symmetry. In another embodiment, half of the coupled sectorial loop antenna is electrically coupled to a ground plane, where the antenna includes one pie-slice shaped sector and two arches. In alternate embodiments, sections of the sector can be removed to reduce the weight of the antenna system.Type: GrantFiled: August 22, 2005Date of Patent: September 11, 2007Assignee: EMAG Technologies, Inc.Inventors: Kamal Sarabandi, Nader Behdad
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Publication number: 20070139291Abstract: An antenna system that is positioned within a support structure. The antenna system includes at least one antenna that may have one or more antenna elements formed on a substrate. The support structure encloses the antenna and includes an outer support portion defining a cavity and an inner support portion positioned within the cavity. The antenna is positioned within the cavity between the outer support portion and the inner support portion so that the antenna is substantially surrounded by air.Type: ApplicationFiled: February 27, 2007Publication date: June 21, 2007Applicant: EMAG Technologies, Inc.Inventors: Kazem Sabet, Kamal Sarabandi, Linda Katehi, Jiyoun Munn
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Patent number: 7196637Abstract: A vehicle tire interrogation system for interrogating sensors embedded in a vehicle tire. The interrogation system both transmits and receives appropriate RF signals to and from the sensors. The system includes antennas operating at two separate frequency bands that have an input impedance at both frequency bands at 50 ohms, are horizontally polarized, and have a gain at a minimum of 2 dBi at the two frequency bands. The antennas may be printed dual band antennas, such as wideband tapered slot antennas, dual band printed dipoles with reflectors or Yagi-Uda array antennas. The antennas can be embedded in various support structures to protect both the antenna and the vehicle tires.Type: GrantFiled: September 30, 2004Date of Patent: March 27, 2007Assignee: EMAG Technologies, Inc.Inventors: Kazem F. Sabet, Kamal Sarabandi, Linda P. Katehi, Jiyoun Munn
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Patent number: 7075493Abstract: The present invention disclosed design aspects and the measured results of a miniaturized resonant narrow slot antenna. The resonant narrow slot radiating elements have a planar geometry and are capable of transmitting vertical polarization when placed nearly horizontal. A resonant narrow slot antenna according to the present invention simplifies impedance matching. Slot dipoles can be excited by a microstrip line and can be matched to arbitrary line impedances by moving the feed point along the slot. Antenna miniaturization can be achieved by using a high permittivity or permeability substrate and superstrate materials and/or using an appropriate antenna topology. Miniaturization is achieved through providing a unique geometry for a resonant narrow slot antenna. A very efficient radiating element is provided. With the virtual enforcement of the required boundary condition at the end of a slot antenna, the area occupied by the resonant antenna can be reduced.Type: GrantFiled: May 1, 2002Date of Patent: July 11, 2006Assignee: The Regents of the University of MichiganInventors: Reza Azadegan, Kamal Sarabandi
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Publication number: 20060055619Abstract: A single-element antenna system that provides a wide bandwidth and consistent polarization over the frequency range to which the antenna is impedance matched. In one embodiment, the wideband antenna system includes two parallel coupled sectorial loop antennas (CSLA) that are coupled along an axis of symmetry. In another embodiment, half of the coupled sectorial loop antenna is electrically coupled to a ground plane, where the antenna includes one pie-slice shaped sector and two arches. In alternate embodiments, sections of the sector can be removed to reduce the weight of the antenna system.Type: ApplicationFiled: August 22, 2005Publication date: March 16, 2006Applicant: EMAG Technologies, Inc.Inventors: Kamal Sarabandi, Nader Behdad
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Publication number: 20050231434Abstract: The present invention disclosed design aspects and the measured results of a miniaturized resonant narrow slot antenna. The resonant narrow slot radiating elements have a planar geometry and are capable of transmitting vertical polarization when placed nearly horizontal. A resonant narrow slot antenna according to the present invention simplifies impedance matching. Slot dipoles can be excited by a microstrip line and can be matched to arbitrary line impedances by moving the feed point along the slot. Antenna miniaturization can be achieved by using a high permittivity or permeability substrate and superstrate materials and/or using an appropriate antenna topology. Miniaturization is achieved through providing a unique geometry for a resonant narrow slot antenna. A very efficient radiating element is provided. With the virtual enforcement of the required boundary condition at the end of a slot antenna, the area occupied by the resonant antenna can be reduced.Type: ApplicationFiled: May 1, 2002Publication date: October 20, 2005Applicant: The Regents of the University of MichiganInventors: Reza Azadegan, Kamal Sarabandi
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Patent number: 6933812Abstract: An artificial electro-ferromagnetic meta-material demonstrates the design of tunable band-gap and tunable bi-anisotropic materials. The medium is obtained using a composite mixture of dielectric, ferro-electric, and metallic materials arranged in a periodic fashion. By changing the intensity of an applied DC field the permeability of the artificial electro-ferromagnetic can be properly varied over a particular range of frequency. The structure shows excellent Electromagnetic Band-Gap (EBG) behavior with a band-gap frequency that can be tuned by changing the applied DC field intensity. The building block of the electro-ferromagnetic material is composed of miniaturized high Q resonant circuits embedded in a low-loss dielectric background. The resonant circuits are constructed from metallic loops terminated with a printed capacitor loaded with a ferro-electric material. Modifying the topology of the embedded-circuit, a bi-anisotropic material (tunable) is examined.Type: GrantFiled: October 10, 2003Date of Patent: August 23, 2005Assignee: The Regents of the University of MichiganInventors: Kamal Sarabandi, Hossein Mosallaei
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Publication number: 20050174294Abstract: A compact, efficient and electronically tunable antenna is presented. A single-fed resonant slot loaded with a series of PIN diode switches constitute the fundamental structure of the antenna. The antenna tuning is real by changing its effective electrical length, which is controlled by the bias voltages of the solid state shunt switches along the slot antenna. Although the design is based on a resonant configuration, an effective bandwidth of 1.7:1 is obtained through this tuning without requiring a reconfigurable matching network. Four resonant frequencies from 540 to 890 MHz are selected in this bandwidth and very good matching is achieved for all resonant frequencies. Theoretical and experimental behavior of the antenna parameters is presented and it is demonstrated that the radiation pattern, efficiency and polarization state of the antenna remain essentially unaffected by the frequency tuning.Type: ApplicationFiled: May 31, 2002Publication date: August 11, 2005Applicant: The Regents of the University of MichiganInventors: Dimitrios Peroulis, Kamal Sarabandi, Linda Katehi
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Publication number: 20050146402Abstract: An artificial electro-ferromagnetic meta-material demonstrates the design of tunable band-gap and tunable bi-anisotropic materials. The medium is obtained using a composite mixture of dielectric, ferro-electric, and metallic materials arranged in a periodic fashion. By changing the intensity of an applied DC field the permeability of the artificial electro-ferromagnetic can be properly varied over a particular range of frequency. The structure shows excellent Electromagnetic Band-Gap (EBG) behavior with a band-gap frequency that can be tuned by changing the applied DC field intensity. The building block of the electro-ferromagnetic material is composed of miniaturized high Q resonant circuits embedded in a low-loss dielectric background. The resonant circuits are constructed from metallic loops terminated with a printed capacitor loaded with a ferro-electric material. Modifying the topology of the embedded-circuit, a bi-anisotropic material (tunable) is examined.Type: ApplicationFiled: October 10, 2003Publication date: July 7, 2005Inventors: Kamal Sarabandi, Hossein Mosallaei
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Patent number: 6906669Abstract: A multifunction printed antenna for wireless and telematic applications. In one embodiment, GPS and satellite radio patch antenna elements are printed on one side of a printed circuit board and AMPS, PCS, GSM and terrestrial radio slot antenna elements are etched in a ground plane on an opposite side of the same printed circuit board. In an alternate embodiment, the GPS and satellite radio patch antenna elements are elements mounted on one printed circuit board and the AMPS, GSM, PCS and terrestrial radio slot antenna elements are etched in a ground plane on another printed circuit board rigidly secured orthogonal to the GPS and satellite printed circuit board.Type: GrantFiled: September 29, 2003Date of Patent: June 14, 2005Assignee: EMAG Technologies, Inc.Inventors: Kazem F. Sabet, Kamal Sarabandi, Linda P. B. Katehi
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Publication number: 20050110627Abstract: A vehicle tire interrogation system for interrogating sensors embedded in a vehicle tire. The interrogation system both transmits and receives appropriate RF signals to and from the sensors. The system includes antennas operating at two separate frequency bands that have an input impedance at both frequency bands at 50 ohms, are horizontally polarized, and have a gain at a minimum of 2 dBi at the two frequency bands. The antennas may be printed dual band antennas, such as wideband tapered slot antennas, dual band printed dipoles with reflectors or Yagi-Uda array antennas. The antennas can be embedded in various support structures to protect both the antenna and the vehicle tires.Type: ApplicationFiled: September 30, 2004Publication date: May 26, 2005Applicant: EMAG Technologies, Inc.Inventors: Kazem Sabet, Kamal Sarabandi, Linda Katehi, Jiyoun Munn
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Publication number: 20040056812Abstract: A multifunction printed antenna for wireless and telematic applications. In one embodiment, GPS and satellite radio patch antenna elements are printed on one side of a printed circuit board and AMPS, PCS, GSM and terrestrial radio slot antenna elements are etched in a ground plane on an opposite side of the same printed circuit board. In an alternate embodiment, the GPS and satellite radio patch antenna elements are elements mounted on one printed circuit board and the AMPS, GSM, PCS and terrestrial radio slot antenna elements are etched in a ground plane on another printed circuit board rigidly secured orthogonal to the GPS and satellite printed circuit board.Type: ApplicationFiled: September 29, 2003Publication date: March 25, 2004Applicant: EMAG Technologies, Inc.Inventors: Kazem F. Sabet, Kamal Sarabandi, Linda P. B. Katehi
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Patent number: 6664932Abstract: A multifunction printed antenna for wireless and telematic applications. In one embodiment, GPS and satellite radio patch antenna elements are printed on one side of a printed circuit board and AMPS, PCS, GSM and terrestrial radio slot antenna elements are etched in a ground plane on an opposite side of the same printed circuit board. In an alternate embodiment, the GPS and satellite radio patch antenna elements are elements mounted on one printed circuit board and the AMPS, GSM, PCS and terrestrial radio slot antenna elements are etched in a ground plane on another printed circuit board rigidly secured orthogonal to the GPS and satellite printed circuit board. The AMPS, GSM and PCS circuit board can be curved to reduce the nulls at the edges of the circuit board. Further, the edge of the AMPS, GSM and PCS circuit board that contacts the GPS and satellite radio circuit board can have a saw-tooth pattern so that edge currents are reduced.Type: GrantFiled: February 27, 2002Date of Patent: December 16, 2003Assignee: EMAG Technologies, Inc.Inventors: Kazem F. Sabet, Kamal Sarabandi, Linda P. B. Katehi, Panayiotis Frantzis
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Patent number: 6509880Abstract: An integrated planar antenna including a metalized ground plane printed on a dielectric slab. One or more slot antenna elements are etched into the metalized layer, and resonate at a particular resonant frequency band. A plurality of voids extend through the slab and act to vary the dielectric constant of the slab so that resonant waves are suppressed in the slab, thus reducing power loss in the antenna. The voids can be selectively localized in the slab to provide various functions, such as impedance matching and reduction of antenna element coupling. The voids can take on any shape and configuration in accordance with a particular antenna design scheme so as to optimize the effective dielectric constant for a particular application. In one particular design, the voids are formed in a random manner completely through slab, and the voids have an opening diameter less than {fraction (1/20)}th of the operational wavelength of the antenna.Type: GrantFiled: April 19, 2001Date of Patent: January 21, 2003Assignee: EMAG Technologies, Inc.Inventors: Kazem F Sabet, Kamal Sarabandi, Linda P. B. Katehi, Tayfun Ozdemir
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Publication number: 20020175879Abstract: A multifunction printed antenna for wireless and telematic applications. In one embodiment, GPS and satellite radio patch antenna elements are printed on one side of a printed circuit board and AMPS, PCS, GSM and terrestrial radio slot antenna elements are etched in a ground plane on an opposite side of the same printed circuit board. In an alternate embodiment, the GPS and satellite radio patch antenna elements are elements mounted on one printed circuit board and the AMPS, GSM, PCS and terrestrial radio slot antenna elements are etched in a ground plane on another printed circuit board rigidly secured orthogonal to the GPS and satellite printed circuit board. The AMPS, GSM and PCS circuit board can be curved to reduce the nulls at the edges of the circuit board. Further, the edge of the AMPS, GSM and PCS circuit board that contacts the GPS and satellite radio circuit board can have a saw-tooth pattern so that edge currents are reduced.Type: ApplicationFiled: February 27, 2002Publication date: November 28, 2002Inventors: Kazem F. Sabet, Kamal Sarabandi, Linda P.B. Katehi, Panayiotis Frantzis
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Patent number: 6480162Abstract: An omni-directional printed antenna that includes at least two wound slot antenna elements. The spacing between the elements, the lengths of the elements and the feed location of the elements are selected to provide a desirable electromagnetic coupling between the elements that causes the narrow bandwidth of the individual elements to combine into a wide bandwidth while providing an omni-directional radiation pattern. Winding the elements together in this manner also allows different antennas for different frequency bands to be combined as a single antenna in a small space. Further, the printed antenna can be patterned on a copper tape to create a sticker type antenna that can be readily mounted on different surfaces.Type: GrantFiled: January 11, 2001Date of Patent: November 12, 2002Assignee: EMAG Technologies, LLCInventors: Kazem F. Sabet, Kamal Sarabandi, Linda P. B. Katehi, Panayiotis Frantzis
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Publication number: 20020057220Abstract: An integrated planar antenna including a metalized ground plane printed on a dielectric slab. One or more slot antenna elements are etched into the metalized layer, and resonate at a particular resonant frequency band. A plurality of voids extend through the slab and act to vary the dielectric constant of the slab so that resonant waves are suppressed in the slab, thus reducing power loss in the antenna. The voids can be selectively localized in the slab to provide various functions, such as impedance matching and reduction of antenna element coupling. The voids can take on any shape and configuration in accordance with a particular antenna design scheme so as to optimize the effective dielectric constant for a particular application. In one particular design, the voids are formed in a random manner completely through slab, and the voids have an opening diameter less than {fraction (1/20)}th of the operational wavelength of the antenna.Type: ApplicationFiled: April 19, 2001Publication date: May 16, 2002Inventors: Kazem F. Sabet, Kamal Sarabandi, Linda P. B. Katehi, Tayfun Ozdemir