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51. Variable Termination Unit for Noise-Parameter Measurements
Topic: Electromagnetics
Published: 4/1/2009
Authors: Dazhen Gu, David K Walker, James Paul Randa
Abstract: NIST has upgraded its measurement capability of noise parameters on low-noise amplifiers with a variable termination unit (VTU) in the 1 to 12.4 GHz frequency range. Such a unit allows improved time efficiency and accuracy in the noise-temperature me ...

52. EEEL Technical Accomplishments
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7568
Topic: Electromagnetics
Published: 3/30/2009
Author: Erik M Secula
Abstract: This document describes the technical work of the Electronics and Electrical Engineering Laboratory. In this report, you will find that EEEL researchers are developing the world's most advanced sensors, providing advanced gamma ray imagers for astro ...

53. Electromagnetic Emissions and Performance for Proximity RFID
Topic: Electromagnetics
Published: 3/23/2009
Authors: Jeffrey R Guerrieri, David R Novotny, Michael H Francis, Catherine A Remley
Abstract: We examined the electromagnetic emissions, and performance of commercial High-Frequency (HF) proximity Radio Frequency Identification (RFID) systems including their susceptibility to jamming and eavesdropping. These proximity RFID systems are used in ...

54. Measurements of Randomly Placed Wireless Transmitters used as an Array for Receivers Located within the Array Volume with Application to Emergency Responders
Topic: Electromagnetics
Published: 3/4/2009
Authors: William F Young, Edward E. Kuester, Christopher L Holloway
Abstract: Abstract: Emergency responders often experience poor quality wireless communications due to the complex radio-frequency propagation environment encountered at a typical emergency response location, such as an apartment complex, office building, or ot ...

55. Measurements of Metamaterial-Inspired, Electrically Small Antenna Systems
Topic: Electromagnetics
Published: 3/2/2009
Authors: Christopher L Holloway, John M Ladbury, Richard Ziolkowski, Peng Jin, Chia-Ching Lin
Abstract: The paper discusses the analysis and measurements of electrical small antennas. The antennas discussed here are based on antenna designed from metamaterial inspired concepts. An electromagnetic reverberation chamber is used for the test of the antenn ...

56. Statistical Measurement Techniques for Equivalent Source Mismatch of 1.85 mn Power Splitter
Topic: Electromagnetics
Published: 12/12/2008
Authors: Thomas M Wallis, Arkadiusz C. (Arkadiusz) Lewandowski
Abstract: The equivalent source mismatch (GG) of a 1.85 mm coaxial power splitter was characterized using two statistical measurement techniques. The first technique, originally described by Juroshek in reference [1], uses a modified one-port calibration metho ...

57. Controlled Transport of Magnetic Particles Using Soft Magnetic Patterns
Topic: Electromagnetics
Published: 11/20/2008
Authors: Richard Conroy, Gary Zabow, John M Moreland, Alan P. Koretsky
Abstract: Inspired by magnetic bubble memory technology, we demonstrate the temporal and spatial manipulation of superparamagnetic beads guided by soft magnetic patterns in a rotating magnetic field. Soft magnetic structures allow complex and repetitive tasks ...

58. Using Reverberation Chambers to Determine the Shielding Effectiveness of Physically Small, Electrically Large Enclosures/Cavities
Topic: Electromagnetics
Published: 11/20/2008
Authors: Christopher L Holloway, David Allan Hill, Marco Sandroni, John M Ladbury, Jason B Coder, Galen H Koepke, Andrew C Marvin
Abstract: With the proliferation of small electric devices in recent years, along with various other applications, there is a growing need to test and determine the shielding properties or shielding effectiveness (SE) of physically small (but electrically larg ...

59. HF Proximity RFID Electromagnetic Emissions and Performance
Topic: Electromagnetics
Published: 11/16/2008
Authors: Jeffrey R Guerrieri, David R Novotny, Catherine A Remley, Michael H Francis
Abstract: We examined the emissions, and performance of commercial High-Frequency Radio Frequency Identification (HF RFID) systems to interrupt and eavesdropping. These proximity RFID systems are used in an increasing number of financial, identification, and ...

60. Polarimetric calibration of indoor and outdoor polarimetric radar cross section systems
Topic: Electromagnetics
Published: 11/16/2008
Author: Lorant A. Muth
Abstract: We use a set of dihedrals to perform polarimetric calibrations on an indoor RCS measurement range. We obtain simultaneously hh, hv, vh, and vv polarimetric data as the calibration dihedrals rotate about the line-of-site to the radar. We apply Fourier ...

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