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You searched on: Topic Area: Electromagnetics

Displaying records 11 to 20 of 51 records.
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11. 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 ...

12. 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 ...

13. 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 ...

14. 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 ...

15. 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 ...

16. 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 ...

17. Quantitative Permittivity Measurements of Nanoliter Liquid Volumes in Microfluidic Channels to 40 GHz.
Topic: Electromagnetics
Published: 12/1/2010
Authors: James C Booth, Nathan D 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 ...

18. Impact of RF Interference between a Passive RFID System and a Frequency Hopping Communications System in the 900 MHz ISM Band
Topic: Electromagnetics
Published: 7/25/2010
Author: Michael R Souryal
Abstract: We present experimental measurements and analysis of RF interference between a passive RFID system and a generic frequency hopping communications system in the 902 928 MHz ISM radio band. Interference in both directions is considered, RFID to communi ...

19. Characterization of Tissue-Equivalent Materials for High-Frequency Applications (200 MHz to 20 GHz)
Series: Technical Note (NIST TN)
Report Number: 1554
Topic: Electromagnetics
Published: 7/1/2010
Authors: James R. Baker-Jarvis, Sung Kim, Luke Leschallinger, Justin Johnson, Brad Givot
Abstract: The purpose of this report is to summarize the characterization of a number of high-frequency solid, liquid, and semisolid tissue-equivalent materials, from 200 MHz to 20 GHz. Carbon black and liquid mixtures were studied, but were found to be uns ...

20. 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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