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Search Publications

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Displaying 201 - 225 of 1580

Experimental Bounds on Classical Random Field Theories

December 10, 2014
Author(s)
Joffrey K. Peters, Sergey V. Polyakov, Jingyun Fan, Alan L. Migdall
Alternative theories to quantum mechanics motivate important fundamental tests of our understanding and description of the smallest physical systems. Here we place experimental limits on those classical field theories which result in power-dependent

A geometric description of nonreciprocity in coupled two-mode systems

October 16, 2014
Author(s)
Leonardo M. Ranzani, Jose A. Aumentado
We explore the concept of nonreciprocity in coupled two-mode systems using a geometric mapping to the Poincaré sphere. From this perspective, we recast the requirements for nonreciprocity in terms of rotation and inversion symmetry arguments for the vector

Parameter Estimation and Uncertainty Evaluation in a Low Rician K-Factor Reverberation-Chamber Environment

October 15, 2014
Author(s)
Chih-Ming Wang, Catherine A. Remley, Ansgar T. Kirk, Ryan J. Pirkl, Christopher L. Holloway, Dylan F. Williams, Paul D. Hale
In this paper we study statistical methods for estimating the Rician K-factor when this parameter is small. A fiducial approach for making statistical inference on the K-factor is discussed. The approach requires a Monte Carlo method to compute the

Amplifier and Transistor Noise-Parameter Measurements

October 1, 2014
Author(s)
James P. Randa
Methods for measuring the noise parameters of amplifiers and on-wafer transistors are reviewed. After some preliminary background information and conventions, noise parameters are defined and the most common measurement strategies are presented, both for

Detection of Hazardous Liquids using Microwave

September 24, 2014
Author(s)
Michael D. Janezic, Jolene D. Splett, Kevin J. Coakley, James R. Baker-Jarvis
The primary objective of this study is to determine the feasibility of using low-power microwaves to distinguish between hazardous and non-hazardous liquids at security checkpoints. According to the 2008 High-Priority Technology Needs, a report published

Absorption Characteristics and SAR of a Lossy Sphere inside a Reverberation Chamber

September 1, 2014
Author(s)
Christopher L. Holloway, Damir Senic, John M. Ladbury, Galen H. Koepke
This study presents an experimental approach to the analysis of absorption characteristics of a lossy dielectric object in a reverberant environment. The study used a canonically shaped water-filled sphere, convenient for ACS calculations (analytical or by

Relative Humidity Effects on Rectangular Waveguide Thermistor Sensors

August 24, 2014
Author(s)
Thomas P. Crowley
A correlation between the relative humidity nd the effective efficiency of several rectangular waveguide thermistor sensors has been observed. The difference between effective efficiency measurements made at 10 % and 30 % relative humidity can be 10 times

Dielectrofluidics for Electronic-Based Chemical and Particle Analysis

August 18, 2014
Author(s)
James C. Booth, Spencer T. Egan, Charles A. Little, A Padilla, Yu Y. Wang, Nathan D. Orloff
The interactions of electromagnetic fields with matter are described by means of the polarization and magnetization of the material under study. Analogous to the way that magnetofluidics seeks to exploit magnetic interactions for sensing and manipulating

Broadband Rydberg Atom Based Self-Calibrating RF E-field Probe

August 16, 2014
Author(s)
Christopher L. Holloway, Joshua A. Gordon, Steven R. Jefferts, Thomas P. Heavner
We present a significantly new approach for an electric (E) field probe. The probe is based on the interaction of RF-fields with Rydberg atoms, where alkali atoms are excited optically to Rydberg states and the applied RF-field alters the resonant state of

Characterizing a Device's susceptibility to broadband signals: A case study

August 4, 2014
Author(s)
Jason B. Coder, John M. Ladbury, David Hunter
It is common for electronic devices to be tested for their susceptibility to radiated signals they may be exposed to during their normal operation. A reverberation chamber is well suited to perform this type of testing because it can expose the device

Dielectric characterization by microwave cavity perturbation corrected for non-uniform fields

July 23, 2014
Author(s)
Nathan D. Orloff, Jan Obrzut, Christian J. Long, Thomas F. Lam, James C. Booth, David R. Novotny, James A. Liddle, Pavel Kabos
The non-uniform fields that occur due to the slot in the cavity through which the sample is inserted and those due to the sample geometry itself decrease the accuracy of dielectric characterization by cavity perturbation at microwave frequencies. To

Evaluating and Verifying the Performance of the Ft. Huachuca Compact Range

July 6, 2014
Author(s)
Michael H. Francis, Ronald C. Wittmann
The National Institute of Standards and Technology (NIST) presents a plan for evaluating and verifying the performance of the refurbished Ft. Huachuca Antenna Test Facility outdoor compact range. This plan was drawn up based upon information supplied to

Evaluating the Performance of the Ft. Huachuca Compact Range

July 6, 2014
Author(s)
Michael H. Francis, Ronald C. Wittmann
The National Institute of Standards and Technology (NIST) presents a plan for evaluating and verifying the performance of the refurbished Ft. Huachuca Antenna Test Facility outdoor compact range. This plan was drawn up based upon information supplied to
Displaying 201 - 225 of 1580
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