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NIST Authors in Bold

Displaying 876 - 900 of 1560

Radio-Frequency Metrology from NBS to NIST, The Legacy

May 1, 2001
Author(s)
Dennis S. Friday
We review a century of metrology research and development in the U.S. that paralleled the birth of radio/wireless and other electromagnetic field technologies. The interplay between the scientific and technological advances and the research, measurement

IEEE Transactions on Antennas and Propagation

March 27, 2001
Author(s)
Richard G. Geyer, J. R. Wait
A general Sommerfeld integral formulation is given for the electromagnetic (EM) fields of an oscillating vertical Magnetic or electric dipole over an electrically inhomogeneous thin sheet. The electrical properties of the sheet are characterized by a

Dielectric Properties of Materials for Packaging from 1 to 60 GHz

March 26, 2001
Author(s)
Y. Kantor, Michael D. Janezic, Pavel Kabos, Billy F. Riddle, James R. Baker-Jarvis
Measurements of the complex permittivity of commonly used packaging materials, as a function of temperature, in the frequency range of 1-60 GHz are presented. The results were obtained using a re-entrant cavity, a split cylinder cavity, a split post

Four-Port Microwave Measurement System Speeds On-Wafer Calibration and Test

March 1, 2001
Author(s)
Dave K. Walker, Dylan F. Williams, Allen Padilla, Uwe Arz, Hartmut Grabinski
A multiport measurement system comprising a coaxial switch network and comprehensive freeware package extends the capabilities of a user's two-port automatic network analyzer and probe station to three-and four-port measurements. The coaxial switch matrix

Sub-Picowatt Precision Radiometry Using Superconducting Transition Edge Sensor Bolometers

March 1, 2001
Author(s)
James A. Chervenak, Erich N. Grossman, Carl D. Reintsema, Kent D. Irwin, S. H. Mosely, C. A. Allen
We describe a cryogenic radiometric calibration system suitable for high sensitivity, low power bolometers. The system uses a variable temperature blackbody source capable of temperatures of 4-20 K, whose output covers the sub-millimeter wavelength regime

Suppression of Flux Jumps in Marginally Stable Niobium-Tin Superconductors

March 1, 2001
Author(s)
Ronald B. Goldfarb, Loren F. Goodrich, T Pyon, E. A. Gregory
Niobium-tin superconductor wires with coalesced filaments may have reduced adiabatic stability. Magnetization measurements on such marginally stable conductors exhibit flux jumps, which appear as a sudden decrease in magnetization as the applied field is

Exploring Site Quality Above 1 GHz Using Double Ridged Horns

February 1, 2001
Author(s)
Dennis G. Camell, Robert T. Johnk, K. R. Hall
This is a summary of recent exploratory efforts conducted by the American National Standards Institute (ANSI) Accredited Standards Committee C63, Sub-Committee 1,working group 1-13.2 on site requirements for radiated measurements above 1GHz. The main

Measuring Antennas Above 1 GHz

February 1, 2001
Author(s)
Michael Windler, Dennis G. Camell
The techniques for EMC measurements used with antennas above 1 GHz have been gleaned from methods used at lower frequencies. The assumptions made in applying these techniques have not been completely validated. This analysis will compare antennas for use

Ferrite Ceramics at Microwave Frequencies

January 1, 2001
Author(s)
Richard G. Geyer
Ferrite ceramics are widely used in microwave devices to control transmission path, frequency, amplitude, and phase of microwave signals. Accurate dielectric and magnetic property measurements at the operational frequency and temperature ranges are needed

Microwave Dielectric Property Measurements

January 1, 2001
Author(s)
Richard G. Geyer, Jerzy Krupka
Materials, whether in the solid, liquid or gaseous states, may be electrically nonlinear, anisotropic, inhomogeneous and dispersive with respect to frequency. Dispersion results from loss mechanisms that differ in different types of materials and vary with

Asymmetric coupled CMOS lines-an experimental study

December 1, 2000
Author(s)
Uwe Arz, Dylan F. Williams, Dave K. Walker, Hartmut Grabinski
Abstract: This paper investigates the properties of asymmetric coupled lines built in a 0.25- m CMOS technology over the frequency range of 50 MHz to 26.5 GHz. We show that the frequency-dependent line parameters extracted from calibrated four-port

Directivity of the Test Device in EMC Measurements 1

December 1, 2000
Author(s)
Galen H. Koepke, David A. Hill, John M. Ladbury
We present a statistical theory for estimating the directive characteristics of unintentional emitters based on the electrical size of the device. We compare this theory to directivity derived from pattern measurements in an anechoic chamber. We also use

International Comparison, Final Summary Report

November 1, 2000
Author(s)
James P. Randa
An international comparison of noise temperature of coaxial (GPC-7) sources at 2 GHz, 4 GHz and 12 GHz has been completed. Participating laboratories included the Physikalisch-Technische Bundesanstalt (PTB); the Bureau National de Metrologie-Laboratoire
Displaying 876 - 900 of 1560