Patents Assigned to ETS Lindgren, L.P.
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Patent number: 8412112Abstract: Embodiments include systems and methods for simulating a multipath environment for testing a device. In one embodiment, a plurality of antennas are placed around a device under test in an anechoic chamber. Each of a plurality of the antennas is connected to a path of a variable path simulator capable of generating multiple paths between the antennas and external wireless communication test equipment. The variable path simulator introduces a delay spread into each path. In this way, a multipath environment is simulated with signals appearing to arrive from different angles and different distances. Each of a plurality of antennas may be adapted to produce substantially plane waves at the device under test.Type: GrantFiled: May 4, 2010Date of Patent: April 2, 2013Assignee: ETS-Lindgren, L.P.Inventor: Michael Foegelle
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Patent number: 8331869Abstract: Embodiments include systems and methods for testing a wireless device, especially one with multiple antennas. In one embodiment, a plurality of antennas are placed around a device under test in an anechoic chamber. Each of a plurality of the antennas is connected to a path of a variable path simulator capable of generating multiple paths between the antennas and external wireless communication test equipment. The variable path simulator introduces a delay spread into each path. In this way, a multipath environment is simulated with signals appearing to arrive from different angles and different distances.Type: GrantFiled: July 24, 2007Date of Patent: December 11, 2012Assignee: ETS Lindgren, L.P.Inventor: Michael Foegelle
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Patent number: 8330640Abstract: Embodiments include an anechoic chamber lined with absorber to absorb electromagnetic energy incident upon the absorber and reflector edge interfaces. The chamber comprises a reflector to reflect waves from a source to form a substantially plane wave field in a test zone within the chamber. In some embodiments, the outer periphery of the reflector extends to the interior walls, floor and ceiling of the chamber. The outer periphery of the reflector is embedded in the absorber in some embodiments.Type: GrantFiled: October 22, 2009Date of Patent: December 11, 2012Assignee: ETS Lindgren, L.P.Inventor: Kefeng Liu
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Patent number: 8326229Abstract: Embodiments include systems and methods for over-the-air testing of wireless systems. Embodiments comprise separated anechoic chambers containing wireless devices. The anechoic chambers are connected by propagation path corridors.Type: GrantFiled: March 25, 2010Date of Patent: December 4, 2012Assignee: ETS Lindgren, L.P.Inventor: Michael Foegelle
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Patent number: 7965986Abstract: Embodiments include systems and methods for over-the-air testing of wireless systems. Embodiments comprise separated anechoic chambers containing wireless devices. The anechoic chambers are connected by propagation path corridors.Type: GrantFiled: June 7, 2007Date of Patent: June 21, 2011Assignee: ETS-Lindgren, L.P.Inventor: Michael Foegelle
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Patent number: 7610810Abstract: Embodiments include an acoustic source for use in a hemi-anechoic chamber comprising a source assembly and a waveguide assembly for producing sound outside of a measurement hemisphere and channeling the sound into the measurement hemisphere. A waveguide end from which sound emanates is positioned close to the reflecting plane of the chamber and can approximate a point source.Type: GrantFiled: January 10, 2008Date of Patent: November 3, 2009Assignee: Ets-Lindgren, L.P.Inventor: Douglas Frank Winker
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Patent number: 7210557Abstract: An isolator is partially but substantially recessed in an acoustic floor and a leveling mechanism at least partially recessed in the acoustic floor is connected to the acoustic isolator to adjust the height of the acoustic floor when the floor is in place.Type: GrantFiled: April 6, 2004Date of Patent: May 1, 2007Assignee: ETS-Lindgren, L.P.Inventors: John A. Phillips, Robert W. Hayes
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Patent number: 6995728Abstract: The present invention provides apparatus and methods for a ridge horn antenna that exhibits improved directivity and main lobe of the radiation pattern at the high end of the frequency range for which its gain remains usably high, while providing a relatively low VSWR across the frequency range of operation.Type: GrantFiled: August 18, 2004Date of Patent: February 7, 2006Assignee: ETS Lindgren, L.P.Inventor: Vicente Rodriguez
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Patent number: 6782971Abstract: The present invention provides methods and apparatus for constructing an acoustic absorbing structure, such as a wall or enclosure, with removable and serviceable acoustic absorbing panels.Type: GrantFiled: August 23, 2002Date of Patent: August 31, 2004Assignee: ETS-Lindgren, L.P.Inventors: Steven Dutton, John Phillips
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Patent number: 6738008Abstract: A matching network hybrid electro-magnetic compatibility (EMC) absorber. A substrate of any number of materials serves as the frame on which partial coatings are placed. Design parameters governing the substrate and other parameters governing the coating control the electrical properties of the matching network hybrid EMC absorber. By performing partial and/or full coating, the physical shape and mechanical properties of the matching network hybrid EMC absorber may be de-coupled from the electrical properties. A designer modifies and controls the electrical performance of an electro-magnetic test system by special-tailoring a matching network hybrid EMC absorber. An electro-magnetic wave to ensure that a majority of the electro-magnetic wave is absorbed into a lossy, absorber material mounted on the walls of a test chamber in the frequency range from 20-500 MHz.Type: GrantFiled: December 21, 2000Date of Patent: May 18, 2004Assignee: ETS-Lindgren L.P.Inventors: Kefeng Liu, Bryan H. Sayler, Vicente RodrÃquez-Pereyra