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Topic Area: Electromagnetics

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11. Measurement of orbital asymmetry and strain in Co^d90^Fe^d10^/Ni multilayers and alloys: Origins of perpendicular anisotropy
Topic: Electromagnetics
Published: 2/13/2013
Authors: Justin M Shaw, Hans T. Nembach, Thomas J Silva
Abstract: We use broadband ferromagnetic resonance spectroscopy and x-ray diffraction to investigate the fundamental origin of perpendicular anisotropy in Co^d90^Fe^d10^/Ni multilayers. By careful evaluation of the spectroscopic {I}g{/I}-factor, we determine ...

12. Antenna-Environment Multiple Scattering in Reverberation Chamber Measurements
Topic: Electromagnetics
Published: 12/12/2012
Authors: Ryan J. Pirkl, Catherine A Remley
Abstract: High-resolution synthetic aperture measurements in a reverberation chamber revealed the presence of multiple scattering between the scan antenna and the measurement environment. Casting the scan antenna-environment multiple scattering as an error ...

13. A Raytracing Model for Wireless Propagation in Tunnels with Varying Cross Section
Topic: Electromagnetics
Published: 12/3/2012
Authors: Camillo A Gentile, Fabien Andre Valoit
Abstract: Spurred by the 2006 Miner Act, reliable two-way communications in mines has drawn the interest of network engineers in recent years. Critical to the design of these systems is an accurate channel propagation model. Given the elementary geometry see ...

14. Early-time Behavior in Reverberation Chambers and Its Effect on the Relationships Between Coherence Bandwidth, Chamber Decay Time, RMS Delay Spread, and the Chamber Build-up Time
Topic: Electromagnetics
Published: 8/12/2012
Authors: Christopher L Holloway, Haider Shah, Ryan J. Pirkl, Catherine A Remley, David Allan Hill, John M Ladbury
Abstract: The use of reverberation chambers for electromagnetic testing is widely being accepted for use in many measurement applications. In recent years reverberation chambers are beginning to merge as a test facility for testing wireless device and for emu ...

15. Reverberation Chamber Measurement Correlation
Topic: Electromagnetics
Published: 6/15/2012
Authors: Ryan J. Pirkl, Catherine A Remley, Christian S Lotback Patane
Abstract: This contribution evaluates the utility of several different metrics for studying reverberation chamber measurement correlation. Metrics considered are the autocovariance, the correlation matrix, and two metrics based upon the entropy of the data ...

16. A Large-Signal Model of Ferroelectric Thin-Film Transmission Lines"
Topic: Electromagnetics
Published: 12/1/2011
Authors: Eduard Rocas, Juan C. Collado Gomez, Jordi Mateu, Nathan Daniel Orloff, James C Booth, Juan Manuel O'C allaghan
Abstract: "This work evaluates the microwave nonlinear properties and tuning at RF frequencies of ferroelectric Ba0.3Sr0.7TiO3 thin-films by on-wafer measurements of the second and third-order harmonics and intermodulation products of several coplanar transmis ...

17. Verification of Noise-Parameter Measurements and Uncertainties
Topic: Electromagnetics
Published: 11/1/2011
Authors: James Paul Randa, Dazhen Gu, David K Walker
Abstract: We propose and implement verification methods for measurements of noise parameters of amplifiers and transistors. Because the verification rests on the comparison of different measurement results, it also serves as a test of the uncertainties. The ve ...

18. On-Chip Security Using Electromagnetic Analysis
Series: Grant/Contract Reports (NISTGCR)
Report Number: 687-12-71
Topic: Electromagnetics
Published: 10/27/2011
Authors: James Schaffner, Dylan F Williams
Abstract: In this report we describe a test bed designed to assess the vulnerabilities of security microcontrollers to electromagnetic monitoring, and use the test bed to show that it is indeed possible to gather more local information from electromagnetic mon ...

19. 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 ...

20. 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 ...

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