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Displaying records 11 to 20 of 76 records.
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11. 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 ...

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

13. MIMO Capacity in 2-D and 3-D Isotropic Environments
Topic: Electromagnetics
Published: 5/21/2013
Authors: Ryan J. Pirkl, Catherine A Remley
Abstract: We analyze the distribution of MIMO channel capacity for different antennas in 2-D and 3-D statistically isotropic environments. These represent possible test environments that may be generated by multi-probe anechoic and reverberation chambers, ...

14. NIST Handbook 150-11, NVLAP Electromagnetic Compatibility and Telecommunications
Series: Handbook (NIST HB)
Report Number: 150-11
Topic: Electromagnetics
Published: 4/25/2013
Authors: Bethany E Hackett, Bradley W Moore, Dennis G. Camell
Abstract: NIST Handbook 150-11, NVLAP Electromagnetic Compatibility and Telecommunications, presents the technical requirements and guidance for the accreditation of laboratories under the NVLAP Electromagnetic Compatibility and Telecommunications (ECT) LAP. I ...

15. 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 ...

16. 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 ...

17. Polymer Membranes to Quarter-Wave Match Gaussian Optics
Topic: Electromagnetics
Published: 2/18/2013
Authors: Jack T Surek, Jason B Coder, Joshua A Gordon, David R Novotny
Abstract: We demonstrate that a simple quarter wave match designed for 110 GHz in WR10 waveguide reduces reflected power by a factor of ten at high density polyethylene (HDPE)-air interfaces. Polytetrafluoroethylene (PTFE)-based membranes that are expanded by ...

18. 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 Toya 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 ...

19. A frequency-bandgap waveguide controlled with metafilms composed of cubic particles
Topic: Electromagnetics
Published: 11/20/2012
Authors: Sung Kim, Christopher L Holloway, Michael D Janezic, Kendra L. Kumley, James R. Baker-Jarvis, Edward Kuester
Abstract: We present a rectangular S-band waveguide having electromagnetic bandgap properties (stopbands) controlled with sheets of metafilms composed of ceramic particles, in which we present both analytic and experimental results. Metafilms composed of TiO( ...

20. A Reference Modulated Scatterer for ISO18000-6 UHF Tag Testing
Topic: Electromagnetics
Published: 11/15/2012
Authors: David R Novotny, Daniel G Kuester, Jeffrey R Guerrieri
Abstract: We present a method for measuring Ultra-High Frequency Radio-Frequency Identification (UHF RFID) tag differential RCS that has the potential for being easier and more accurate than current and proposed methods [1-2]. This method is based on accurate ...

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