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21. The Reverberation Chamber's Unstirred Field: A Validation of the Image Theory Interpretation
Topic: Electromagnetics
Published: 8/15/2011
Authors: Ryan J. Pirkl, John M Ladbury, Catherine A Remley
Abstract: Synthetic aperture measurements of a reverberation chamber's unstirred wireless channel are used to compare the observed power, time-of-arrival, and angle-of-arrival of unstirred multipath components to that predicted by ray/image theory for a re ...

22. O2 A-band line parameters to support atmospheric remote sensing. Part II: The rare isotopologues
Topic: Electromagnetics
Published: 7/21/2011
Authors: Joseph Terence Hodges, David A Long, Daniel K Havey, S. S. Yu, M Okumura, Charles E Miller
Abstract: Frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) was employed to measure over 100 transitions in the R-branch of the b1Σg+←X3Σg-(0,0) band for the rare O2 isotopologues. The use of 17O- and 18O-enriched mixtures allowed fo ...

23. 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 (Atif) Imtiaz, Pavel Kabos, Paul Timothy 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 ...

24. Development of a multifilament PIT V3Ga conductor for fusion applications
Topic: Electromagnetics
Published: 6/12/2011
Authors: Najib Cheggour, Theodore C Stauffer, Loren Frederick Goodrich, L. R. Motowidlo, J Distin, P. J. Lee, David C. Larbalestier, A. K. Ghosh
Abstract: Previous studies on V3Ga assert its suitability for use in proposed fusion reactors. V3Ga may outperform Nb3Sn in a fusion reactor environment based on its relatively flat critical-current profile in the 15 T- 20 T range, resilience to applied strain ...

25. Strain and Magnetization Properties of High Subelement Count Tube-type Nb3Sn Strands
Topic: Electromagnetics
Published: 6/6/2011
Authors: Najib Cheggour, X Peng, E Gregory, M Tomsic, M D Sumption, A. K. Ghosh, Xifeng Lu, Theodore C Stauffer, Loren Frederick Goodrich, Jolene D Splett
Abstract: Abstract,A tubular technique for economical production of Nb3Sn material with large numbers of subelements is being explored by Supergenics I LLC and Hyper Tech Research Inc. The number of subelements was increased to 919 (744 subelements plus 175 Cu ...

26. Boundary Effects on the Determination of the Effective Parameters of a Metamaterial from Normal Incidence Reflection and Transmission
Topic: Electromagnetics
Published: 6/1/2011
Authors: Sung Kim, Edward E. Kuester, Christopher L Holloway, James R. Baker-Jarvis, Aaron D. Scher
Abstract: This paper presents a method for the determination of the effective electromagnetic parameters of a metamaterial, taking boundary effects at the interfaces between a conventional material and metamaterial into account. In the technique presented here ...

27. Microwave Characterization of Transparent Conducting Films
Topic: Electromagnetics
Published: 5/26/2011
Authors: Jan Obrzut, Oleg A Kirillov
Abstract: The high frequency conductivity of thin metallic and graphitic nano-films attracts interest due to many potential applications in spin electronics, electromagnetic shielding, flexible antennas, displays, and solar cells. The surface morphology of thi ...

28. Fluid interactions with metafilm/metasurfaces for tuning, sensing, and microwave assisted chemical processes
Topic: Electromagnetics
Published: 5/25/2011
Authors: Joshua A Gordon, Christopher L Holloway, James C Booth, James R. Baker-Jarvis, David R Novotny, Sung Kim, Yu Y. Wang
Abstract: In this paper we demonstrate tunability of a metafilm, which is the two-dimensional equivalent of a metamaterial, also referred to as a metasurface, by changing the permittivity in a micro-fluidic channel that interacts with the metafilm. Numerical s ...

29. NIST's High Frequency Metrology Program: Current Capabilities and Future Directions
Topic: Electromagnetics
Published: 3/31/2011
Author: Ronald A Ginley
Abstract: There are several core areas that are covered by the NIST microwave metrology services. These include thermal noise, power, scattering-parameters (s-parameters), field strength and antenna parameters. The rapid change in technology and the current ec ...

30. Quantitative Permittivity Measurements of Nanoliter Liquid Volumes in Microfluidic Channels to 40 GHz.
Topic: Electromagnetics
Published: 12/1/2010
Authors: James C Booth, Nathan Daniel Orloff, Jordi Mateu, James A Beall, Matthew Rinehart
Abstract: We describe the design, fabrication, and evaluation of a new on-wafer measurement platform for the rapid, quantitative determination of the complex permittivity of nL fluid volumes over the frequency range from 10 MHz - 40 GHz. Our measurement platfo ...

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