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Search Publications by: Michael H. Francis (Assoc)

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Displaying 26 - 50 of 178

Evaluating and Verifying the Performance of the Ft. Huachuca Compact Range

July 6, 2014
Author(s)
Michael H. Francis, Ronald C. Wittmann
The National Institute of Standards and Technology (NIST) presents a plan for evaluating and verifying the performance of the refurbished Ft. Huachuca Antenna Test Facility outdoor compact range. This plan was drawn up based upon information supplied to

Evaluating the Performance of the Ft. Huachuca Compact Range

July 6, 2014
Author(s)
Michael H. Francis, Ronald C. Wittmann
The National Institute of Standards and Technology (NIST) presents a plan for evaluating and verifying the performance of the refurbished Ft. Huachuca Antenna Test Facility outdoor compact range. This plan was drawn up based upon information supplied to

INTERNATIONAL COMPARISON OF KU-BAND STANDARD GAIN HORN CHARACTERIZATION

April 11, 2014
Author(s)
Jeffrey R. Guerrieri, David R. Novotny, Michael H. Francis, Jason B. Coder, Joshua A. Gordon
International comparison of antenna measurement results between national measurement laboratories supports interoperability of communication equipment in today’s world market. The National Institute of Standards and Technology (NIST) is the pilot National

On the Use of Phase Data When Conducting an Extrapolation Measurement

November 1, 2013
Author(s)
Jason B. Coder, David R. Novotny, Michael H. Francis, Jeffrey R. Guerrieri
The extrapolation measurement technique has been used with the three antenna method for more than 40 years, to determine absolute antenna gain and polarization data. The critical part of the extrapolation technique is an insertion loss measurement that is

Using a Laser Tracker to Actively Coordinate the Motion of a 3m Industrial Robot to Within 50 Microns: An ongoing effort to accurately determine and correct positioning errors.

October 1, 2013
Author(s)
David R. Novotny, Joshua A. Gordon, Jason B. Coder, Jeffrey R. Guerrieri, Michael H. Francis
We are using industrial-grade robotics guided by a metrology-grade laser tracker to perform antenna calibrations at mmWave frequencies. We are using a 3 m-reach robot to spherically scan a milli-meter Wave (mmWave) probe around an antenna under test (AUT)

Sensitivity of Probes in Near-Field Spherical-Scanning Antenna Measurements

July 7, 2013
Author(s)
Ronald C. Wittmann, Michael H. Francis
We define and calculate sensitivity for several actual and simulated probes. Probe sensitivity can have a significant impact on measurement uncertainty associated with probe deconvolution in near- field, spherical scanning, antenna measurements.

Estimating Uncertainties in Antenna Measurements

April 8, 2013
Author(s)
Michael H. Francis
We describe general methods of estimating uncertainties in antenna measurements. These include estimates based on theory (analysis1), simulation, and altering the measurement system (self-coparison tests). The important component sources of uncertainty in

ROBOTICALLY CONTROLLED MM-WAVE NEAR-FIELD PATTERN RANGE

October 21, 2012
Author(s)
Josh Gordon, David R. Novotny, Jeffrey R. Guerrieri, Jason Coder, Michael Francis
The Antenna Metrology Lab at the National Institute of Standards and Technology in Boulder Colorado has developed a robotically controlled near-field pattern range for measuring antennas and quasi-optical components from 50 GHz to 500 GHz. This range is

An Improved Antenna Gain Extrapolation Measurement

November 1, 2012
Author(s)
Jason B. Coder, David R. Novotny, Jeffrey R. Guerrieri, Michael H. Francis, Brian C. Stillwell
An improved antenna gain extrapolation measurement is proposed. The improved method consists of a vector network analyzer, a pair of RF optical links, and a pair of waveguide mixers. We present a detailed description of the new extrapolation measurement

An Improved Antenna Gain Extrapolation Measurement

October 20, 2012
Author(s)
Jason Coder, David R. Novotny, Jeffrey R. Guerrieri, Michael H. Francis, Brian C. Stillwell
An improved antenna gain extrapolation measurement is proposed. The improved method consists of a vector network analyzer, a pair of RF optical links, and a pair of waveguide mixers. We present a detailed description of the new extrapolation measurement