Patents by Inventor Daniel T. McGrath
Daniel T. McGrath 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: 20200274244Abstract: Described is a hybrid notch antenna comprising a flared notch antenna structure and a transverse electromagnetic (TEM) horn structure having walls disposed through or attached to the notch antenna structure member such that the TEM horn is integrated with the notch antenna to form a hybrid TEM/notch antenna.Type: ApplicationFiled: February 25, 2019Publication date: August 27, 2020Applicant: Raytheon CompanyInventors: Daniel T. McGrath, Michael Streitwieser, Brian W. Johansen
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Patent number: 10749262Abstract: An antenna transmission system includes a dual-feedline tapered slot antenna configured to generate a radiated output signal in response to a radio frequency (RF) signal. A power divider is configured to split a source RF signal into a plurality of RF feed signals. A plurality of transmitting amplifiers convert the plurality RF feed signals into a plurality of amplified RF feed signals; and a plurality of feedlines deliver the plurality of amplified RF feed signals to the dual-feedline tapered slot antenna. The dual-feedline tapered slot antenna generates the radiated output signal in response to the plurality of amplified RF feed signals.Type: GrantFiled: February 14, 2018Date of Patent: August 18, 2020Assignee: RAYTHEON COMPANYInventors: Daniel T. McGrath, Brian W. Johansen, Michael C. Streitwieser
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Patent number: 10741924Abstract: Described is a hybrid notch antenna comprising a flared notch antenna structure and a transverse electromagnetic (TEM) horn structure having walls disposed through or attached to the notch antenna structure member such that the TEM horn is integrated with the notch antenna to form a hybrid TEM/notch antenna.Type: GrantFiled: February 25, 2019Date of Patent: August 11, 2020Assignee: Raytheon CompanyInventors: Daniel T. McGrath, Michael Streitwieser, Brian W. Johansen
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Publication number: 20190252787Abstract: An antenna transmission system includes a dual-feedline tapered slot antenna configured to generate a radiated output signal in response to a radio frequency (RF) signal. A power divider is configured to split a source RF signal into a plurality of RF feed signals. A plurality of transmitting amplifiers convert the plurality RF feed signals into a plurality of amplified RF feed signals; and a plurality of feedlines deliver the plurality of amplified RF feed signals to the dual-feedline tapered slot antenna. The dual-feedline tapered slot antenna generates the radiated output signal in response to the plurality of amplified RF feed signals.Type: ApplicationFiled: February 14, 2018Publication date: August 15, 2019Inventors: Daniel T. McGrath, Brian W. Johansen, Michael C. Streitwieser
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Patent number: 9997827Abstract: A base block of a flare antenna may be made by: forming a ground plane on a base insulating layer; forming an intermediate insulating layer over the ground plane; patterning radiating and shorting traces on the intermediate insulating layer; forming a top insulating layer over the radiating and shorting traces; forming a top metallization layer; connecting the top metallization layer to the ground plane with vias passing through the intermediate insulating layer; and forming a via that contacts the radiating trace and passes through the ground plane and is not in electrical contact with the top metallization layer or the ground plane.Type: GrantFiled: March 3, 2016Date of Patent: June 12, 2018Assignee: RAYTHEON COMPANYInventor: Daniel T. McGrath
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Publication number: 20170256848Abstract: A base block of a flare antenna may be made by: forming a ground plane on a base insulating layer; forming an intermediate insulating layer over the ground plane; patterning radiating and shorting traces on the intermediate insulating layer; forming a top insulating layer over the radiating and shorting traces; forming a top metallization layer; connecting the top metallization layer to the ground plane with vias passing through the intermediate insulating layer; and forming a via that contacts the radiating trace and passes through the ground plane and is not in electrical contact with the top metallization layer or the ground plane.Type: ApplicationFiled: March 3, 2016Publication date: September 7, 2017Inventor: Daniel T. McGrath
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Patent number: 7576701Abstract: A system for steering a beam includes a main reflector that receives a signal from a subreflector and reflects the signal in a reflection direction. A prism refracts the signal in a refraction direction. One or more motors adjust a relative orientation between the main reflector and the prism to change a relative orientation between the reflection direction and the refraction direction to steer a beam resulting from the signal.Type: GrantFiled: April 2, 2007Date of Patent: August 18, 2009Assignee: Raytheon CompanyInventors: Daniel T. McGrath, Kuang-Yu Wu, Matthew Fassett, James C. McRae
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Publication number: 20080238790Abstract: A system for steering a beam includes a main reflector that receives a signal from a subreflector and reflects the signal in a reflection direction. A prism refracts the signal in a refraction direction. One or more motors adjust a relative orientation between the main reflector and the prism to change a relative orientation between the reflection direction and the refraction direction to steer a beam resulting from the signal.Type: ApplicationFiled: April 2, 2007Publication date: October 2, 2008Inventors: Daniel T. McGrath, Kuang-Yu Wu, Matthew Fassett, James C. McRae
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Patent number: 7138952Abstract: According to one embodiment of the invention, an array antenna includes a substrate body, a first antenna element, and a second antenna element. The first antenna element is coupled to the substrate body and is operable to transmit or receive a first signal. The second antenna element is coupled to the substrate body and is operable to transmit or receive a second signal. The first antenna element is of a different type than the second antenna element. The direction of polarization of the first signal is different than the direction of polarization of the second signal.Type: GrantFiled: January 11, 2005Date of Patent: November 21, 2006Assignee: Raytheon CompanyInventors: Daniel T. Mcgrath, Timothy H. Shively
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Patent number: 7098853Abstract: According to an embodiment of the present invention, a conformal channel monopole array antenna includes a base plate having a continuous electrically conducting channel formed therein, and a substrate coupled to the base plate. The substrate has a plurality of radiating elements formed on a first surface thereof. Each radiating element includes a radiating portion, a feed line, and a resistive end load. The feed lines are configured to couple to respective ones of a plurality of transmission elements.Type: GrantFiled: July 21, 2004Date of Patent: August 29, 2006Assignee: Raytheon CompanyInventors: Daniel T. McGrath, Richard S. Johnson
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Patent number: 6864851Abstract: A phased array antenna having a low profile (approximately ? wavelength) wide bandwidth (approximately 50%). The invention teaches making such an antenna using open channel resonators and monopole wave launchers. The wave launchers may conveniently be made on circuit card assemblies with strip lines that mimic coaxial cable monopole wave launchers. The channel resonators may be made in sections that are soldered to the circuit card assemblies. The circuit card assemblies have plated through holes that trace the edges of the resonator sections to provide electrical continuity.Type: GrantFiled: September 26, 2002Date of Patent: March 8, 2005Assignee: Raytheon CompanyInventor: Daniel T. McGrath
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Publication number: 20040061656Abstract: A phased array antenna having a low profile (approximately ⅛ wavelength) wide bandwidth (approximately 50%). The invention teaches making such an antenna using open channel resonators and monopole wave launchers. The wave launchers may conveniently be made on circuit card assemblies with strip lines that mimic coaxial cable monopole wave launchers. The channel resonators may be made in sections that are soldered to the circuit card assemblies. The circuit card assemblies have plated through holes that trace the edges of the resonator sections to provide electrical continuity.Type: ApplicationFiled: September 26, 2002Publication date: April 1, 2004Inventor: Daniel T. McGrath
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Patent number: 6642889Abstract: A reflect array antenna comprises a non-electrically conductive substrate with an array of antenna elements supported on the substrate. Each antenna element comprises a plurality of patch radiating elements arranged in rows and columns. Each patch radiating element comprises a plurality of notches formed in the element, the notches being angularly displaced around the circumference of the element. A plurality of stub short transmission lines are individually positioned in each of the plurality of notches and a plurality of switches individually couple one end of a notch to one of the plurality of stub short transmission lines.Type: GrantFiled: May 3, 2002Date of Patent: November 4, 2003Assignee: Raytheon CompanyInventor: Daniel T. McGrath
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Patent number: 4899164Abstract: The microstrip constrained lens is a three-dimensional beamformer comprised of two printed circuit layers. The two circuit boards contain planar arrays of microstrip patches that face in opposite directions, to respectively collect and reradiate energy from a feed suspended behind the structure. It is a wide angle beamformer due to its use of two geometric degrees of freedom: the length of line joining front and back face lens elements varies with radius; and the back face elements are displaced radially instead of being placed directly behind their front face counterparts. An early version of this microwave lens used feed-through pins. In the most recent design the feed-through pins of the first model were replaced with a solderless slot coupler, or capacitive coupler. Without the need to solder the many hundreds of feed-throughs, the device is much easier to fabricate, and its performance is better because there is no degradation introduced by misalignment of the feed-through pins.Type: GrantFiled: September 16, 1988Date of Patent: February 6, 1990Assignee: The United States of America as represented by the Secretary of the Air ForceInventor: Daniel T. McGrath
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Patent number: 4721966Abstract: A planar microwave beamforming lens system achieves wide-angle scanning using a planar lens by using a design in two degrees of freedom. One degree of freedom is provided by varying lengths of transmission lines between aperture side elements and feed side elements as a function of radius. A second degree of freedom results from the distribution of feed side elements so that they are displaced radially from their corresponding aperture elements as a function of the radius of the planar lens. All aperture antenna elements are regularly distributed over the aperture side of the planar lens.Type: GrantFiled: May 2, 1986Date of Patent: January 26, 1988Assignee: The United States of America as represented by the Secretary of the Air ForceInventor: Daniel T. McGrath