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Electronics

Electromagnetics

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Displaying 951 - 975 of 1580

Multiport Noise Characterization and Differential Amplifiers

June 1, 2000
Author(s)
James P. Randa
I address the issue of the definition and measurement of noise figure and parameters to characterize multiport devices, particularly differential amplifiers. A parameterization in terms of the noise matrix appears to be the most practical. The noise figure

Realistic Sampling-Circuit Model for a Nose-to-Nose Simulation

June 1, 2000
Author(s)
Catherine A. Remley, Dylan F. Williams, Donald C. DeGroot
We extend previously developed oscilloscope sampler models to include realistic circuit characteristics and use these models to investigate the nose-to-nose calibration technique.

International Comparison GT/RF 86-1 Electric Field Strengths: 27 MHz to 10 GHz

May 1, 2000
Author(s)
Motohisa Kanda, Dennis G. Camell, Jan P. deVreede, J. Achkar, M. Alexander, Michele Borsero, H. Yajima, N. S. Chung, H. Trzaska
this paper describes the international comparison of electric field strength measurements at frequencies between 27 MHz and 10GHz (GT/RF 86-1) The participating laboratories were NIST, pilot laboratory (USA), NPL, (UK), NmiVSL (the Netherlands), IEN (Italy

International Comparison GT/RF 86-1 Electrical Field Strengths, 27 MHz to 10 GHz

May 1, 2000
Author(s)
Motohisa Kanda, Dennis G. Camell, J. Achkar, M. Alexander, Jan P. deVreede, Michele Borsero, H. Yajima, N. S. Chung, H. Trzaska
This paper descirbes the international comparison of electric field strength measurements at frequencies between 27 MHz and 10 GHz (GT/RF 86-1). The participating laboratories were NIST, Pilot Laboratory, USA, National Physical Laboratory, U.K. Nmi Van

Noise-Source Stability Measurements

May 1, 2000
Author(s)
James P. Randa, L. A. Terrell, Lawrence P. Dunleavy
We report results of stability tests on several noise sources for selected frequencies between 12 and 26.5 GHz. Measurements covered intervals of about 1 week and about 1 year or more. Drifts in noise temperature were typically less than the uncertainty of

RF Material Characterization Using a Large-Diameter (76.8 mm) Coaxial Air Line

May 1, 2000
Author(s)
Chriss A. Jones, John H. Grosvenor Jr, Claude Weil
We report the development of a 76.84 mm (3.025 in) diameter coaxial air line system whose purpose is to measure the dielectric and magnetic properties of bulk dielectric and ferrite materials over a frequency range of approximately 0.3 - 1500 MHZ. We

Vectorial second-harmonic magneto-optic kerr effect measurement

May 1, 2000
Author(s)
Pavel Kabos, Anthony B. Kos, Thomas J. Silva
A significant modification of an existing experimental technique based on the second-harmonic magneto-optical Kerr effect (SH-MOKE) is introduced. With a p-polarized pumping optical wave incident upon a magnetic film, the transverse component of

Coherent Control of Precessional Dynamics in Thin Film Permalloy

April 1, 2000
Author(s)
T. M. Crawford, Pavel Kabos, Thomas J. Silva
We demonstrate a method of eliminating overshoot and ringing in magnetizaiton dynamics when the system bandwidth includes the intrinsic ferromagnetic resonance (FMR). The method employsstaggered step excitation for the cancellation of FMR oscillations

Dielectric Measurements of Substrates and Packaging Materials

April 1, 2000
Author(s)
James R. Baker-Jarvis, Billy F. Riddle
We summarize measurement results on many polymer, ceramic, and composite substrate and packaging materials. Measurements on low-loss materials are obtained from closed and open cavity resonators, as well as dielectric-resonator methods. Measurements of the

Design and Testing of NFRad - A New Noise Measurement System

March 1, 2000
Author(s)
Chriss A. Grosvenor, James P. Randa, Robert L. Billinger
The NIST Noise project has constructed and tested a new, automated, coaxial (GPC-7) radiometer for the measurement of noise sources in the 8-12 GHz frequency band. It is an isolated, total-power radiometer that relies on lookup tables for relevant

Magnetic Switching

February 22, 2000
Author(s)
Richard G. Geyer, Pavel Kabos
Almost all present-day applications of ferromagnetic materials are based on the fact that magnetization may move from one stable state to another.

Dielectric Ceramic Materials

February 9, 2000
Author(s)
Richard G. Geyer
Accurate rf dielectric and magnetic characterization of ferrite ceramics requires combined measurement techniques.

Ferromagnetic Resonance Detection with a Torsion-mode Atomic-force Microscope

February 1, 2000
Author(s)
M. Loehndorf, John M. Moreland, Pavel Kabos
We have developed a ferromagnetic resonance (FMR) instrument based on a torsion-mode atomic-force microscope (AFM). The instrument measures the torque on a magnetized thin film in a static out-of-plane field perpendicular to the film surface. The magnetic

RF Material Characterization Using a Large-Diameter (76.8 mm) Coaxial Air Line

February 1, 2000
Author(s)
Chriss A. Jones, John H. Grosvenor Jr, Claude Weil
We report the development of a 76.84 mm (3.025 in) diameter coaxial air line system whose purpose is to measure the dielectric and magnetic properties of bulk dielectric and ferrite materials over a frequency range of approximately 0.3 - 1500 MHZ. We

Acceptor Doping of Barium Strontium Titanate and Magnesium Oxide Composites

January 1, 2000
Author(s)
J. Synowczynski, G. Dewing, Richard G. Geyer, John H. Grosvenor Jr
The microwave dielectric properties of bulk barium strontium titanate and magnesium oxide ceramic composites are measured with cylindrical mode-filtered cavity and dielectric sleeve resonator techniques. The cylindrical wall of the mode- filtered cavity
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