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Search Publications by: Christopher L. Holloway (Fed)

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Displaying 251 - 275 of 431

Experimental Verification of Z Antennas at UHF Frequencies

December 8, 2009
Author(s)
Christopher L. Holloway, Richard Ziolkowski, Peng Jin, J. A. Nielsen, M. H. Tanielian
Both 300 MHz and 570 MHz versions of the electrically small coaxially-fed Z antenna were designed and tested. These two cases demonstrate the ability to change the resonance frequency of the Z antenna by changing the value of its lumped element inductor

A Discussion on the Interpretation and Characterization of Metafilms/Metasurfaces: The Two-Dimensional Equivalent of Metamaterials

October 1, 2009
Author(s)
Christopher L. Holloway, Andrew M. Dienstfrey, Edward E. Kuester, John F. O'Hara, Abul K. Azad
A metafilm is the surface equivalent of a metamaterial. More precisely, a metafilm is a surface distribution of suitably chosen electrically small scatterers. Metafilms are becoming popular as an alternative to the full three-dimensional metamaterials

Outdoor-to-Indoor Channel Measurements and Models

September 1, 2009
Author(s)
Catherine A. Remley, Christopher L. Holloway, David W. Matolak
This document reports on wireless channel measurements and models for outdoor to indoor propagation environments. Although there have been a number of publications that have recently appeared on this topic, e.g., [1], [2], and references therein, the

Design and Experimental Verification of a 3D Magnetic EZ Antenna at 300 MHz

August 11, 2009
Author(s)
Christopher L. Holloway, Richard Ziolkowski, Chia-Ching Lin, J. A. Nielsen, M. H. Tanielian
Several variations of a 300 MHz version of the electrically small coax-fed three-dimensional (3D) magnetic EZ antenna were designed and tested. The final design was achieved when the impact of the fabrication techniques on its parameters were understood

Measurements to Support Public Safety Communications: Attenuation and Variability of 750 MHz Radio Wave Signals in Four Large Building Structures: NIST Technical Note 1552

August 7, 2009
Author(s)
William F. Young, Kate Remley, John M. Ladbury, Christopher L. Holloway, Chriss A. Grosvenor, Galen H. Koepke, Sander Floris, Wouter Numan, Andrea Garuti
In this report, we investigate radio communication problems faced by emergency responders (firefighters, police, and emergency medical personnel) in disaster situations. A fundamental challenge to radio communications into and out of large buildings is the

Characterization of a Metafilm/Metasurface

June 1, 2009
Author(s)
Christopher L. Holloway, Andrew M. Dienstfrey, Edward E. Kuester
A metafilm (also referred to as a metasurface) is the surface equivalent of a metamaterial. More precisely, a metafilm is a surface distribution of suitably chosen electrically-small scatterers. Metafilms are becoming popular as an alternative to full

Demonstration of Impedance Matching Using a mu-Negative (MNG) Metamaterial

April 14, 2009
Author(s)
Christopher L. Holloway, R. B. Greegor, C. G. Parazzoli, J. A. Nielsen, M. H. Tanielian, D Vier, S Schultz, Richard Ziolkowski
A mu-negative (MNG) metamaterial hemisphere was used to demonstrate impedance matching for a magnetic loop. The metamaterial was comprised of copper spirals deposited on an alumina substrate. The spirals, hemisphere, and magnetic loop were designed to

DC Internal Inductance for a Conductor of Rectangular Cross Section

April 3, 2009
Author(s)
Christopher L. Holloway, Edward Kuester
In this paper, the DC internal inductance for conductors with rectangular cross-section is investigated. Using a quasistatic Green's function, the magnetic fields inside a rectangular conductor are derived. These magnetic field expressions are used to