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Displaying 101 - 125 of 128

Ultrawideband Time- and Frequency-Domain Characterization of EMC Facilities

January 1, 2003
Author(s)
David R. Novotny, Robert T. Johnk, Claude Weil, Seturnino Canales
We have developed a methodology to determine the quality of an EMC test facility using equipment generally available to RF testing services. By utilizing both the time- and frequency-domain, an accurate picture of the scattering and modal properties of the

Ultra-Wideband Antenna Pattern Characterization in a Non-Ideal EM Facility

November 8, 2002
Author(s)
Jason Veneman, David R. Novotny, Chriss A. Grosvenor, Robert T. Johnk, Seturnino Canales
We present and analyze a procedure for performing relative, ultra-wideband antenna pattern measurements in a non-ideal EM facility. Ultra-wideband, short-impulse, TEM horn transmission measurements were performed and compared with computer-modeled

Ultra-Wideband TEM-Horn Antenna Design using Numerical Methods

November 8, 2002
Author(s)
Chriss A. Grosvenor, David R. Novotny, Jason Veneman, Seturnino Canales
TEM, time-domain antennas are designed to reproduce accurately the time characteristics of an impulsive, incoming field. The response to the fields must be constant in amplitude and linear in phase for minimal distortion. Numerical techniques are employed

Shielding Effectiveness Measurements Using the Direct Illumination Technique

August 20, 2002
Author(s)
Chriss A. Grosvenor, David R. Novotny, Robert T. Johnk, Seturnino Canales, Jason Veneman
In this paper we discuss the direct illumination and reverberation chamber techniques for measuring shielding effectiveness. using the reverberation chamber as our reference, we explain the differences between the measurements and corrections applied to

New Techniques for Calibrating Across-the-Road Traffic Radars

August 17, 2002
Author(s)
Claude Weil, Dennis G. Camell, David R. Novotny, Robert T. Johnk, Arthur Ondrejka
We discuss simulator units for calibrating across-the-road Doppler traffic radars used in highway speed enforcement. Two units of essentially the same design were developed, one operating at K-Band (24 GHz) and the other at Ka-Band (35 GHz). The signal

Calibration of Broadband RF Field Probes Using a Coaxial Transmission Line

May 20, 2002
Author(s)
Claude Weil, David R. Novotny, Robert T. Johnk, Arthur Ondrejka
We discuss a new broadband (10MHz to 40 GHz) RF field standard to be used for calibrating electrically-small electromagnetic field probes. The technique generates a well-defined and uniform TEM mode fields between the conductors of an air-filled coaxial

Time-Domain Measurement System to Characterize Ultrawideband Emissions

October 21, 2001
Author(s)
Robert T. Johnk, David R. Novotny
This paper summarizes some results of a recent NIST measurement effort. The purpose of this effort was to use a NSIT-developed ultrawideband measurement system to assess the time and frequency-domain characteristics of selected ultrawideband transmitting

Time- and Frequency-Domain Analysis of EMC Test Facilities

October 1, 2001
Author(s)
David R. Novotny, Robert T. Johnk, Claude Weil, Seturnino Canales
We have developed a methodology to determine the quality of an EMC test facility using equipment that may be generally available to RF testing services. By utilizing both, the time- and frequency-domains, an accurate picture of the scattering , and modal

Analyzing Broadband Free-Field, Absorber Measurements

August 1, 2001
Author(s)
David R. Novotny, Robert T. Johnk, Arthur Ondrejka
We present and analyze a method for free-field evaluation of broadband absorber in a non-ideal testing environment. Using broadband, short-impulse TEM horns, a frequency-rich spectrum (equivalent pulse length 0.5 ns) illuminates a sample of the material

Modal Cutoff in Coaxial Transmission Lines of Conical and Cylindrical Geometries

May 1, 2001
Author(s)
Claude Weil, Billy F. Riddle, David R. Novotny, Robert T. Johnk
We present numerical data on normalized cutoff wavelength versus cone half-angle for the first three higher-order TE ml modes, as well as four other modes of interest, in conical coaxial transmission lines (the co-conical line). These are given as a

Evaluation of an EMC Compliance Chamber Using an Ultrawideband Measurement System

October 1, 2000
Author(s)
Robert T. Johnk, David R. Novotny, Claude Weil, Marlene Taylor, T. J. O'Hara
This paper summarizes a joint NIST-Industry measurement effort. The purpose of this effort was to use a NIST-developed altrawide band measurement system to assess the performance imporvement of ferrite tile anechoic chamber after a partial retrofit

Low-Cost, Broadband Absorber Measurements

October 1, 2000
Author(s)
David R. Novotny, Robert T. Johnk, Arthur Ondrejka
We present a method for evaluating broadband absorber in a non-ideal testing environment. Using broadband, short impulse TEM horns, a frequency-rich spectrum (equivalent pulse length 0.5 ns) illuminates a sample of material under test and the reflections

Assessing the Effects of an OATS Shelter; Is ANSI C63.7 Enough?

August 1, 2000
Author(s)
Robert T. Johnk, David R. Novotny, Claude Weil, H. W. Medley
This paper summarizes a recent measurement effort by NIST researchers at an open-area test site (OATS), operated by a large information technology equipment manufacturer. The purpose of this effort was to assess the effects on emissions measurements of a

Broadband Electromagnetic Field Sensors with Electro-Optical Links

November 1, 1999
Author(s)
Keith D. Masterson, Motohisa Kanda, David R. Novotny
In this paper, we review the system design, antenna structures, and optoelectronic components that can be used to accurately measure electromagnetic (EM) fields at frequencies up to 100 GHz, in support of the technologies of telecommunications, materials
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