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Displaying records 21 to 30 of 76 records.
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21. Electrical Characterization of Photoconductive GaN Nanowire Devices from 50 MHz to 33 GHz
Topic: Electromagnetics
Published: 7/1/2011
Authors: Thomas M Wallis, Dazhen Gu, Atif A. Imtiaz, Pavel Kabos, Paul T Blanchard, Norman A Sanford, Kristine A Bertness, Christpher Smith
Abstract: The electrical response of two-port., photoconductive GaN nanowire devices was measured from 50 MHz to 33 GHz. The admittance of individual contacted nanowires showed an increase on the order of 10% throughout the measured frequency range after expo ...

22. Electromagnetic Penetration Studies for Three Different Aircraft
Topic: Electromagnetics
Published: 8/17/2009
Authors: Chriss A. Grosvenor, David R Novotny, Dennis G. Camell, Galen H Koepke, Robert Johnk, Nino Canales
Abstract: The National Institute of Standards and Technology has completed penetration studies on three different aircraft for the Federal Aviation Administration. These studies are used to understand cavity coupling characteristics between antennas placed at ...

23. Estimating Uncertainties in Antenna Measurements
Topic: Electromagnetics
Published: 4/8/2013
Author: Michael H Francis
Abstract: We describe general methods of estimating uncertainties in antenna measurements. These include estimates based on theory (analysis1), simulation, and altering the measurement system (self-coparison tests). The important component sources of uncertain ...

24. Evaluation of a Robotically Controlled Millimeter-Wave Near-Field Pattern Range at NIST Determining mechaincal suitability for antenna measurements
Topic: Electromagnetics
Published: 4/8/2013
Authors: David R Novotny, Joshua A Gordon, Jason B Coder, Michael H Francis, Jeffrey R Guerrieri
Abstract: The Antenna Metrology Laboratory at the National Institute of Standards and Technology, USA (NIST) is developing a robotically controlled near-field pattern range for measuring antennas and components from 50 GHz to 500 GHz. This new range is intende ...

25. Experimental Bounds on Classical Random Field Theories
Topic: Electromagnetics
Published: 12/10/2014
Authors: Joffrey Kent Peters, Sergey V Polyakov, Jingyun Fan, Alan L Migdall
Abstract: Alternative theories to quantum mechanics motivate important fundamental tests of our understanding and description of the smallest physical systems. Here we place experimental limits on those classical field theories which result in power-depend ...

26. Experimental Evaluation of the Statistical Isotropy of a Reverberation Chamber‰s Plane-Wave Spectrum
Topic: Electromagnetics
Published: 11/27/2013
Authors: Ryan J. Pirkl, Catherine A Remley
Abstract: Synthetic aperture measurements in a loaded reverberation chamber are used to calculate power-angle profiles describing the instantaneous distribution of received power versus azimuth angle-of-arrival. Averaging multiple power-angle profiles leads to ...

27. Frequency-selective contrast on variably doped p-type silicon with a scanning microwave microscope
Topic: Electromagnetics
Published: 5/14/2012
Authors: Atif A. Imtiaz, Thomas M Wallis, SangHyun (Sang-Hyun) Lim, H. Tanbakuchi, H-P Huber, A. Hornung, P. Hinterdorfer, J. Smoliner, F. Kienberger, Pavel Kabos
Abstract: We report frequency dependent contrast in d(S11)/dV measurements of a variably doped p-type silicon sample in the frequency range from 2GHz to 18GHz. The measurements were conducted bys use of a scanning microwave microscope. The measurements were ...

28. Full-Wave Analysis of Dielectric-Loaded Cylindrical Waveguides and Cavities Using a New Four-Port Ring Network
Topic: Electromagnetics
Published: 8/31/2012
Authors: Felipe Penaranda-foix, Michael D. Janezic, Jose M. Catala-Civera, Antoni J. Canos-Marin
Abstract: In this paper, a full-wave method for the electromagnetic analysis of dielectric-loaded cylindrical and coaxial waveguides and cavities is developed. For this purpose, a new four-port ring network is proposed, and the mode-matching method is applied ...

29. Handheld Firefighter Radio Testing
Topic: Electromagnetics
Published: 6/11/2013
Authors: Catherine A Remley, William F Young, Anthony D Putorti Jr., Michelle K Donnelly

30. High-Frequency Dielectric Measurements: A Tutorial
Topic: Electromagnetics
Published: 4/1/2010
Authors: James R. Baker-Jarvis, Michael D Janezic, Donald C. DeGroot
Abstract: KNOWLEDGE of the response of materials to electromagnetic (EM) fields in the frequency range of radio frequency (RF) through terahertz (THz) is critical to numerous research projects and electronic product development activities. Electromagnetic wave ...

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