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Displaying 301 - 325 of 3122

Antenna Metrology 100-500 GHz: A New Approach

May 16, 2016
Author(s)
Perry F. Wilson, Joshua A. Gordon, David R. Novotny, Jeffrey R. Guerrieri
A typical near-field scanning range for antenna measurements is based on simple translation stages (planar) or stacked rotators (spherical), or both (cylindrical). Above 100 GHz problems arise in both specialized waveguide components, such as precision

Using Frequency Detuning to Improve the Sensitivity of Electric Field Measurements via Electromagnetically Induced Transparency and Autler-Townes Splitting In Rydberg Atoms

March 14, 2016
Author(s)
Christopher L. Holloway, Matthew T. Simons, Joshua A. Gordon
In this work we demonstrate an approach for improved sensitivity in weak RF electric-field measurements using Rydberg EIT in an atomic vapor. This is accomplished by varying the RF frequency around a resonant atomic transition and extrapolating the weak on

Absorption Cross Section Measurements of a Human Body in a Reverberation Chamber

February 8, 2016
Author(s)
Damir Senic, Antonio Sarolic, Zbigniew M. Joskiewicz, Christopher L. Holloway
We provide the results of human body absorption cross section (ACS) measurements. The setup was based on the reverberation chamber as a well-known measurement environment capable of performing ACS measurements. The approach was supported by reference

Spectrum Sensing with WLAN Access Points

January 5, 2016
Author(s)
Jason Coder, Ryan T. Jacobs, Vivian Musser
With wireless communication becoming more and more common in simple everyday devices, the available spectrum is quickly filling up and the risk of interference is increasing. This interference could be a slight nuisance to or it could be a more significant

Testing Spectrum Sensing Networks by UAV

January 5, 2016
Author(s)
Dan Kuester, Ryan T. Jacobs, Yao Ma, Jason Coder
We consider here the use of hovering unmanned aerial vehicles (UAVs) to test spectrum sensing capabilities of Citizen's Broadband Radio Service (CBRS) systems at 3.5 GHz. Aircraft transmit synthesized LTE or pulsed radar modulation to excite spectrum

Microwave characterization of ink-jet printed CPW on PET substrates

December 3, 2015
Author(s)
Thomas M. Wallis
This paper describes microwave characterization of coplanar waveguide (CPW) lines formed by ink-jet printed technology on flexible polyethylene terephthalate (PET) substrates. The reel-to-reel printing process uses inkjet printing as a precursor for 2$\mu

Millimeter-Wave Near-Field Measurements Using Coordinated Robotics

December 1, 2015
Author(s)
Joshua A. Gordon, David R. Novotny, Ronald C. Wittmann, Michael H. Francis, Miranda L. Butler, Jeffrey R. Guerrieri
The National Institute of Standards and Technology(NIST) recently developed a new robotic scanning system for performing near-field measurements at millimeter-wave (mm-wave)frequencies above 100 GHz, the configurable robotic millimeterwave antenna (CROMMA)

Deep-subwavelength Nanometric Image Reconstruction using Fourier Domain Optical Normalization

November 5, 2015
Author(s)
Jing Qin, Richard M. Silver, Bryan M. Barnes, Hui Zhou, Ronald G. Dixson, Mark Alexander Henn
Quantitative optical measurements of deep sub-wavelength, three-dimensional, nanometric structures with sensitivity to sub-nanometer details address an ubiquitous measurement challenge. A Fourier domain normalization approach is used in the Fourier optical

Millimeter-Wave Near-Field Measurements Using Coordinated Robotics

October 29, 2015
Author(s)
Joshua A. Gordon, David R. Novotny, Michael H. Francis, Ronald C. Wittmann, Alexandra Curtin, Miranda L. Butler, Jeffrey R. Guerrieri
The National Institute of Standards and Tech- nology (NIST) recently developed a new robotic scan- ning system for performing near-field measurements at millimeter-wave frequencies above 100 GHz, the CROMMA (Configurable Robotic Millimeter-Wave Antenna)

Antenna Measurement Implementations and Dynamic Positional Validation Using a Six Axis Robot

October 11, 2015
Author(s)
David R. Novotny, Josh Gordon, Michael H. Francis, Ronald C. Wittmann, Alexandra Curtin, Jeffrey R. Guerrieri
We have performed spherical and extrapolation scans of two antennas at 118 GHz using a commercial 6-axis robot. Unlike spherical scanning, linear extrapolations do not precisely conform to the native circular movement of the individual robot axes. To

Consensus Value Method to Compile On-Axis Gain Measurement Results

October 10, 2015
Author(s)
Jeffrey R. Guerrieri, Michael H. Francis, Ronald C. Wittmann
This paper shows that a consensus value method can be used to compile on-axis gain measurement data that have a large range of values and uncertainties. A variety of methods are used to analyze multiple data sets such as un-weighted averages, weighted
Displaying 301 - 325 of 3122
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