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Displaying 601 - 625 of 1314

Free Space Antenna Factors through the use of Time-Domain Signal Processing

July 8, 2007
Author(s)
Dennis G. Camell, Robert T. Johnk, David R. Novotny, Chriss A. Grosvenor
This paper demonstrates the usefulness of time domain processing to determine free-space antenna factors,FSAF, for EMC antennas. Procedures are explained and data is provided from 30 MHz to 9 GHz. We investigate time gating of dense frequency packed

RFID Devices and Systems in Homeland Security Applications

July 1, 2007
Author(s)
Kate Remley, Jeffrey R. Guerrieri, Dylan Williams, David R. Novotny, Anthony B. Kos, Nelson Bryner, Nader Moayeri, Michael Souryal, Kang Lee, Steven Fick
This article reports on activities being carried out by the National Institute of Standards and Technology to ensure secure, reliable use of Radio-Frequency Identification (RFID) technology in homeland security and public safety applications. These

Dielectric polarization evolution equations and relaxation times

May 25, 2007
Author(s)
James R. Baker-Jarvis, Billy F. Riddle, Michael D. Janezic
In this paper we develop a model that can describe broadband dielectric response, and includes frequency-dependent loss and the effects of the local electric field. The model is based on a correlation-function approach that we previously developed using

On-Wafer Measurement of Transistor Noise Parameters at NIST

April 1, 2007
Author(s)
James P. Randa, Dave K. Walker
NIST has developed the capability to measure noise parameters on a wafer int he 1-12.4 GHz range. We describe the measurement method and the uncertainty analysis and present results of measurements on a very poorly matched transistor.

Long-Term Stability Test System for High-Voltage, High-Frequency SiC Power Devices

February 25, 2007
Author(s)
Tam H. Duong, David Berning, Allen R. Hefner Jr., Keyue M. Smedley
This paper presents test system developed for long-term stability characterization of 10 kV Silicon Carbide (SiC) power MOSFETs and SiC diodes under 20 kHz hard switching conditions. The system is designed to operate a single power switch and a single

TEM Horn Antenna Design Principles

January 23, 2007
Author(s)
Chriss A. Grosvenor, Robert T. Johnk, David R. Novotny, Nino Canales, Benjamin Davis, Jason Veneman
The National Institute of Standards and Technology has developed several ultra-wideband, TEM Horn antennas with phase linearity, short impulse duration, and a near constant antenna factor. These are time-domain antennas used to measure impulsive fields

Complex permittivity measurements of planar building materials using a UWB free-field antenna measurement system

January 1, 2007
Author(s)
Ben N. Davis, Chriss A. Grosvenor, Robert T. Johnk, David R. Novotny, James R. Baker-Jarvis, Michael D. Janezic
Building materials are often incorporated into complex, multi-layer macrostructures that are simply not amenable to measurements using coax or waveguide sample holders. In response to this, an ultra-wideband free-field measurement system has been developed
Displaying 601 - 625 of 1314
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