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Search Publications by: Christopher L. Holloway (Fed)

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Displaying 326 - 350 of 431

Realization of a Controllable Metafilm (''Smart Surface'') Composed of Resonant Magnetodielectric Particles: Measurements and Theory

November 1, 2005
Author(s)
Christopher L. Holloway, Pavel Kabos, Mohamed Mohamed, Edward Kuester, Michael D. Janezic, James R. Baker-Jarvis
In previous work, we derived generalized sheet-transition conditions (GSTCs) for the average electromagnetic fields across a metafilm, which, when properly designed, can have certain desired reflection and transmission properties. A metafilm is the two

Propagation and Detection of Radio Signals Before, During, and After the Implosion of a Large Sports Stadium (Veterans’ Stadium in Philadelphia)

October 1, 2005
Author(s)
Christopher L. Holloway, Galen H. Koepke, Dennis G. Camell, Catherine A. Remley, Dylan F. Williams, Susan A. Schima, Seturnino Canales
In this report, we investigate radio communications problems faced by emergency responders (firefighters and police) in disaster situation such as collapsed buildings. A fundamental challenge to communications into and out of large buildings is the strong

Propagation and Detection of Radio Signals Before, During, and After the Implosion of a 13-Story Apartment Building

May 1, 2005
Author(s)
Christopher L. Holloway, Galen H. Koepke, Dennis G. Camell, Catherine A. Remley, Dylan F. Williams, Susan A. Schima, Seturnino Canales, Douglas T. Tamura
In this report we investigate communications problems faced by emergency responders (firefighters and police) in disaster situations (i.e., collapsed buildings). A fundamental challenge to communications into large building structures is the strong

The OATS Method Revisited

April 1, 2005
Author(s)
Christopher L. Holloway, Perry F. Wilson, Robert German
Open area test sites (OATS) or equivalent semi-anechoic chambers are the most commonly used sites for EMC emissions tests. This article discusses the origins of this test methodology and revisits the interference problem (broadcast media) that the OATS

Radio Propagation Measurements During a Building Collapse: Applications for First Responders

March 3, 2005
Author(s)
Christopher L. Holloway, Galen H. Koepke, Dennis G. Camell, Catherine A. Remley, Dylan F. Williams
The National Institute of Standards and Technology is involved in a research project to improve wireless communications for first responders (firefighters and police) in large structures (i.e., large apartment and office buildings, supermarkets, sports

Optimized Arbitrary Wireless Device Arrays for Emergency Response Communications

March 1, 2005
Author(s)
William F. Young, Edward Kuester, Christopher L. Holloway
Wireless communications are essential to emergency responders. Unfortunately, a typical emergency response scenario involves communication into and within structures, which severely interfere with or completely block the radio frequency channel. In this

Measuring the Permittivity and Permeability of Lossy Materials: Solids, Liquids, Metals, and negative-Index Materials

February 1, 2005
Author(s)
James R. Baker-Jarvis, Michael D. Janezic, Billy F. Riddle, Robert T. Johnk, Christopher L. Holloway, Richard G. Geyer, Chriss A. Grosvenor
The goal of this report is to be a comprehensive guide for researchers int he area of dielectric and magnetic measurements of lossy materials. The goal is to assemble the relevant information needed to perform and interpret dielectric measurements on lossy

Wide-Band Slot Antennas with CPW Feed Lines: Hybrid and Log-Periodic Designs

October 11, 2004
Author(s)
Alpesh Bhobe, Christopher L. Holloway, Melinda Piket-May, Richard Hall
In microwave and millimeter wave applications, slot antennas fed by coplanar waveguides (CPW) are receiving increasing attention. These antennas have several useful properties, such as wider bandwidth as compared to microstrip patch antennas and easier

The Effects of Loading Configurations on the Performance of Reverberation Chambers

September 6, 2004
Author(s)
Christopher L. Holloway, Todd Lammers, John M. Ladbury
The presence of lossy objects in reverberation chamber may significantly disturb the reverberant environment and affect the desired field statistics. In this paper, we present a numerical study of the effects of different loading configurations on the