Patents by Inventor Jar J. Lee
Jar J. Lee 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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Patent number: 7417587Abstract: A phase shifter comprises a substrate, a ground plane formed on a first surface of the substrate, a support structure positioned on a second surface of the substrate opposite the first surface, three parallel, non-co-planar microstrip lines supported by the support structure above the second surface of the substrate, a ferrite element supported by the support structure between the second surface of the substrate and the three non-co-planar microstrip lines, and means for applying a magnetic field to the ferrite element.Type: GrantFiled: January 19, 2006Date of Patent: August 26, 2008Assignee: Raytheon CompanyInventors: Magdy F. Iskander, Rory K. Sorensen, Jar J. Lee, Hee Kyung Kim
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Patent number: 7391367Abstract: A system for scanning an antenna array of the present invention. The system includes a first mechanism for modulating a desired signal on an optical carrier signal. The first mechanism includes a frequency-tunable optical oscillator with a phase shifter for changing an output frequency of the optical oscillator. A second mechanism employs the optical carrier signal to derive signals having predetermined phase relationships. A third mechanism receives the feed signals and radiates corresponding transmit signals in response thereto to the antenna array to steer the array. In more specific embodiment, the desired signal is a Radio Frequency (RF) signal, and the phase shifter is an electrically controlled optical RF phase shifter. The optical carrier signal includes a first optical carrier signal and a second optical carrier signal.Type: GrantFiled: September 28, 2004Date of Patent: June 24, 2008Assignee: Raytheon CompanyInventors: Irwin L. Newberg, Steven R. Wilkinson, Jar J. Lee, Robert A. Rosen, Kapriel V. Krikorian
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Patent number: 7336232Abstract: A dual-band, space fed antenna array includes a feed array with a first set of feed radiators for operation in a first frequency band of operation and a second set of feed radiators for operation in a second frequency band of operation. A primary array lens assembly is spaced from and illuminated by the feed array. The primary array lens includes a first set of radiator elements and a second set of radiator elements operable in the first frequency band of operation. The primary array lens assembly also includes a third set of radiator elements and a fourth set of radiator elements operable in the second frequency band of operation.Type: GrantFiled: August 4, 2006Date of Patent: February 26, 2008Assignee: Raytheon CompanyInventors: Jar J. Lee, Clifton Quan, Stanley W. Livingston
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Publication number: 20080030413Abstract: A space-fed conformal array for a high altitude airship includes a primary array lens assembly adapted for conformal mounting to a non-planar airship surface. The lens assembly includes a first set of radiator elements and a second set of radiator elements, the first set and the second set spaced apart by a spacing distance. The first set of radiators faces outwardly from the airship surface to provide a radiating aperture. The second set of radiators faces inwardly toward an inner space of the airship, for illumination by a feed array spaced from the second set of radiators.Type: ApplicationFiled: August 4, 2006Publication date: February 7, 2008Inventors: Jar J. Lee, Clifton Quan, Stanley W. Livingston
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Publication number: 20080030416Abstract: A dual-band, space fed antenna array includes a feed array with a first set of feed radiators for operation in a first frequency band of operation and a second set of feed radiators for operation in a second frequency band of operation. A primary array lens assembly is spaced from and illuminated by the feed array. The primary array lens includes a first set of radiator elements and a second set of radiator elements operable in the first frequency band of operation. The primary array lens assembly also includes a third set of radiator elements and a fourth set of radiator elements operable in the second frequency band of operation.Type: ApplicationFiled: August 4, 2006Publication date: February 7, 2008Inventors: Jar J. Lee, Clifton Quan, Stanley W. Livingston
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Publication number: 20080030420Abstract: A space-fed array is selectively operable in a reflective mode or in a feed-through mode. The array includes, in an exemplary embodiment, a primary array; and a feed array. The primary array includes a first side set of radiating elements, a first set of phase shifters, a set of switches, a second set of phase shifters and a second side set of radiating elements. Each of the switches is connected between corresponding ones of the first set and the second set of phase shifters and ground, selectively settable at an open position or at a closed position. The open position corresponds to the feed through mode, and the closed position corresponds to the reflective mode.Type: ApplicationFiled: August 4, 2006Publication date: February 7, 2008Inventors: Jar J. Lee, Clifton Quan, Stanley W. Livingston
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Patent number: 7315288Abstract: An antenna array includes an array of continuous slots formed in a ground plane structure. A feed structure for exciting the slots includes a periodic set of probe feeds disposed behind the ground plane structure.Type: GrantFiled: January 15, 2004Date of Patent: January 1, 2008Assignee: Raytheon CompanyInventors: Stan W. Livingston, Jar J. Lee, Richard J. Koenig
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Patent number: 7061443Abstract: A millimeter wave (MMW) antenna array includes a continuous transverse stub (CTS) radiating aperture comprising a set of spaced continuous transverse stubs, each having a longitudinal extent. A series feed system is coupled to an excitation source for exciting the stubs with MMW electromagnetic energy having a linear phase progression along the longitudinal extent of the stubs to produce an array beam which can be scanned over a beam scan range by changing the excitation frequency.Type: GrantFiled: April 1, 2004Date of Patent: June 13, 2006Assignee: Raytheon CompanyInventors: Jar J. Lee, Steven R. Wilkinson, Robert A. Rosen, Kapriel V. Krikorian, Irwin L. Newberg
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Patent number: 7034373Abstract: A multilayer switching assembly for switching high frequency signals has MEMS structures on a ceramic substrate having a top surface 500, a bottom surface and a plurality of insulating layers (510,512,514). The insulating layers are separated by at least a first conductor 502 and a second conductor 504. The first conductor 502 is connected to a ground potential. The second conductor 504 is separated from the first conductor 502 by one of the insulating layers. The second conductor presents a specific impedance (50 ohms) with respect to the first conductor to high frequency signals traveling on the second conductor. 64 MEMS structures (e.g. 540,708,716,718, 720) are mounted on the top surface. Each MEMS has an input, an output, and a control. The input connected to the second conductor. The output is connected to a coplanar waveguide (508) placed on the top surface (500). The control is connected to the bottom surface.Type: GrantFiled: December 3, 2004Date of Patent: April 25, 2006Assignee: Raytheon CompanyInventors: Robert C. Allison, Jar J. Lee
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Patent number: 6965349Abstract: A reconfigurable wide band phased array antenna for generating multiple antenna beams for multiple transmit and receive functions. The antenna array comprises multiple long non-resonant TEM slot antenna apertures with RF MEMS switches disposed within the slots. The RF MEMS switches are positioned directly within the feed lines across the slots to directly control the coupling of RF energy to the slots. Multiple RF MEMS switches are used within each slot, which allows multiple transmit/receive functions and/or multiple frequencies to be supported by each slot. The frequency coverage provided by the slot antenna has a greater than 10:1 frequency range.Type: GrantFiled: February 6, 2002Date of Patent: November 15, 2005Assignees: HRL Laboratories, LLC, Raytheon CompanyInventors: Stan W. Livingston, Jar J. Lee, James H. Schaffner, Robert Y. Loo
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Patent number: 6849924Abstract: A multilayer switching assembly for switching high frequency signals has MEMS structures on a ceramic substrate having a top surface, a bottom surface and a plurality of insulating layers. The insulating layers are separated by a first conductor and a second conductor. The first conductor is connected to a ground potential. The second conductor is separated from the first conductor by one of the insulating layers. The second conductor presents a specific impedance (50 ohms) with respect to the first conductor to high frequency signals traveling on the second conductor. 64 MEMS structures are mounted on the top surface. Each MEMS has an input, an output, and a control. The input connected to the second conductor. The output is connected to a coplanar waveguide placed on the top surface. The control is connected to the bottom surface. The input to each MEMS is electrically shielded from the output and from the control by a third conductor connected to the first (grounded) conductor.Type: GrantFiled: May 9, 2002Date of Patent: February 1, 2005Assignee: Raytheon CompanyInventors: Robert C. Allison, Jar J. Lee
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Patent number: 6822615Abstract: A microelectromechanical system (MEMS) steerable electronically scanned lens array (ESA) antenna and method of frequency scanning are disclosed. The MEMS ESA antenna includes a wide band feedthrough lens and a continuous transverse stub (CTS) feed array. The wide band feedthrough lens includes first and second arrays of wide band radiating elements and an array of MEMS phase shifter modules disposed between the first and second arrays of radiating elements. The continuous transverse stub (CTS) feed array is disposed adjacent the first array of radiating elements for providing a planar wave front in the near field. The MEMS phase shifter modules steer a beam radiated from the CTS feed array in two dimensions.Type: GrantFiled: February 25, 2003Date of Patent: November 23, 2004Assignee: Raytheon CompanyInventors: Clifton Quan, Jar J. Lee, Brian M. Pierce, Robert C. Allison
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Publication number: 20040164915Abstract: A microelectromechanical system (MEMS) steerable electronically scanned lens array (ESA) antenna and method of frequency scanning are disclosed. The MEMS ESA antenna includes a wide band feedthrough lens and a continuous transverse stub (CTS) feed array. The wide band feedthrough lens includes first and second arrays of wide band radiating elements and an array of MEMS phase shifter modules disposed between the first and second arrays of radiating elements. The continuous transverse stub (CTS) feed array is disposed adjacent the first array of radiating elements for providing a planar wave front in the near field. The MEMS phase shifter modules steer a beam radiated from the CTS feed array in two dimensions.Type: ApplicationFiled: February 25, 2003Publication date: August 26, 2004Inventors: Clifton Quan, Jar J. Lee, Brian M. Pierce, Robert C. Allison
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Publication number: 20040090365Abstract: A the system for scanning an antenna array (26) adapted for use with active radar arrays. A first mechanism (14, 18, 20, 24) generates an optical signal oscillating at a predetermined frequency. A second mechanism (32, 34) employs the optical signal to derive feed signals, which have predetermined phase relationships. A third mechanism (22) receives the feed signals and radiates corresponding transmit signals in response thereto to the antenna array (26) to steer the antenna array (26) in accordance with the predetermined phase relationships. In a specific embodiment, the transmit signals are microwave frequency signals. The first mechanism (14, 18, 20, 24) includes a first optical oscillator (18) and a second optical oscillator (20) that feed a first optical manifold (32) and a second optical manifold (34), respectively, of the second mechanism (32, 34).Type: ApplicationFiled: November 13, 2002Publication date: May 13, 2004Inventors: Irwin L. Newberg, Steven R. Wilkinson, Jar J Lee, Robert A. Rosen, Kapriel V. Krikorian
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Patent number: 6677899Abstract: A microelectromechanical system (MEMS) steerable electronically scanned lens array (ESA) antenna and method of frequency scanning are disclosed. The MEMS ESA antenna includes a MEMS E-plane steerable lens array and a MEMS H-plane steerable linear array. The MEMS E-plane steerable lens array includes first and second arrays of wide band radiating elements, and an array of MEMS E-plane phase shifter modules disposed between the first and second arrays of radiating elements. The MEMS H-plane steerable linear array includes a continuous transverse stub (CTS) feed array and an array of MEMS H-plane phase shifter modules at an input of the CTS feed array. The MEMS H-plane steerable linear array is disposed adjacent the first array of radiating elements of the MEMS E-plane steerable lens array for providing a planar wave front in the near field.Type: GrantFiled: February 25, 2003Date of Patent: January 13, 2004Assignee: Raytheon CompanyInventors: Jar J. Lee, Clifton Quan, Brian M. Pierce
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Patent number: 6650304Abstract: A space deployable antenna that includes an inflatable envelope, a cylindrical reflector formed on a wall of the envelope, a catenary support frame for maintaining the cylindrical shape of the cylindrical reflector, and a feed array support structure connected to the catenary support frame.Type: GrantFiled: February 28, 2002Date of Patent: November 18, 2003Assignee: Raytheon CompanyInventors: Jar J. Lee, William Derbes, Jonathan D. Gordon
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Publication number: 20030210579Abstract: A multilayer switching assembly for switching high frequency signals has MEMS structures on a ceramic substrate having a top surface, a bottom surface and a plurality of insulating layers. The insulating layers are separated by a first conductor and a second conductor. The first conductor is connected to a ground potential. The second conductor is separated from the first conductor by one of the insulating layers. The second conductor presents a specific impedance (50 ohms) with respect to the first conductor to high frequency signals traveling on the second conductor.Type: ApplicationFiled: May 9, 2002Publication date: November 13, 2003Inventors: Robert C. Allison, Jar J. Lee
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Patent number: 6624720Abstract: A micro electromechanical system (MEMS) transfer switch for simultaneously connecting two radio frequency (RF) input transmission lines among two RF output transmission lines. The MEMS transfer switch includes a plurality of series MEMS switching units operatively arranged with the input and output transmission lines to selectively connect a first input to a first output and a second input to a second output, or the second input to the first output and the first input to the second output.Type: GrantFiled: August 15, 2002Date of Patent: September 23, 2003Assignee: Raytheon CompanyInventors: Robert C. Allison, Jar J. Lee
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Publication number: 20030160733Abstract: A space deployable antenna that includes an inflatable envelope, a cylindrical reflector formed on a wall of the envelope, a catenary support frame for maintaining the cylindrical shape of the cylindrical reflector, and a feed array support structure connected to the catenary support frame.Type: ApplicationFiled: February 28, 2002Publication date: August 28, 2003Inventors: Jar J. Lee, William Derbes, Jonathan D. Gordon
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Patent number: 6404377Abstract: A low cost array with wide band elements interleaved into an “egg-crate” structure. The radiating elements are flared notch radiators. Good impedance match over a wide band was achieved by feeding each element with a tapered quasi-TEM slot line, which transforms a 50-ohm input impedance to a 120-ohm radiation impedance. The radiating elements are fed by a true time delay beam-forming network to ensure that the main beam points.Type: GrantFiled: October 31, 2000Date of Patent: June 11, 2002Assignee: Raytheon CompanyInventors: Jar J. Lee, Stan W. Livingston