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Topic Area: Microwave Measurement Services

Displaying records 11 to 20 of 88 records.
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11. NIST's High Frequency Metrology Program: Current Capabilities and Future Directions
Topic: Microwave Measurement Services
Published: 3/31/2011
Author: Ronald A Ginley
Abstract: There are several core areas that are covered by the NIST microwave metrology services. These include thermal noise, power, scattering-parameters (s-parameters), field strength and antenna parameters. The rapid change in technology and the current ec ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907842

12. Comparison of Microwave Black-Body Target Radiometric Measurements
Topic: Microwave Measurement Services
Published: 7/30/2010
Authors: David K Walker, Dazhen Gu, Katherine MacReynolds, Randy Direen, James Paul Randa, Amanda Cox, Derek Anderson Houtz, Robert L Billinger
Abstract: Accurate characterization of the brightness temperature (T_B) of black-body targets used for calibrating microwave remote-sensing radiometers includes many inputs: antenna pattern and loss, target temperature, target emissivity, mechanical alignment, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906078

13. REFLECTIVITY STUDIES OF PASSIVE MICROWAVE CALIBRATION TARGETS AND ABSORPTIVE MATERIALS
Topic: Microwave Measurement Services
Published: 7/30/2010
Authors: Dazhen Gu, Amanda Cox, Derek Anderson Houtz, David K Walker, James Paul Randa, Robert L Billinger
Abstract: We report the characterization of blackbody reflections as a part of the recent progress on the development of brightness standards for microwave remote sensing at National Institute of Standards and Technology (NIST).Three blackbody targets at varia ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906017

14. COMPARISON OF NEAR-FIELD METHODS AT NIST K. MacReynolds, M.H. Francis and D. Tamura
Topic: Microwave Measurement Services
Published: 7/14/2010
Authors: Katherine MacReynolds, Michael H Francis, Douglas T. Tamura
Abstract: A comparison of the planar, spherical and cylindrical near-field techniques was completed at the National Institute of Standards and Technology (NIST) for a Ku-band Cassegrain reflector antenna. This paper discusses the measurement results for the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906057

15. Comparison of Large-Signal-Network-Analyzer Calibrations
Topic: Microwave Measurement Services
Published: 2/5/2010
Authors: Dylan F Williams, Catherine A Remley, Joe Gering, Grand Aivazian
Abstract: We develop a procedure and metrics for comparing large-signal-network-analyzer calibrations. The metrics we develop provide a bound on differences between measurements obtained from large-signal-network-analyzer calibrations, as well as more specific ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900909

16. NISTeVerify: A fully electronic vector-network-analyzer verification system
Topic: Microwave Measurement Services
Published: 10/1/2009
Authors: Dylan F Williams, Arkadiusz C. (Arkadiusz) Lewandowski, Denis X LeGolvan, Ronald A Ginley
Abstract: The National Institute of Standards and Technology (NIST) has just introduced a fully electronic measurement verification system for microwave vector-network-analyzer (VNA) calibrations called NISTeVerify. The system allows you to quickly verify VNA ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902084

17. Wideband measurement of extreme impedance with a multistate reflectometer
Topic: Microwave Measurement Services
Published: 12/12/2008
Authors: Arkadiusz C. (Arkadiusz) Lewandowski, Denis X LeGolvan, Ronald A Ginley, Thomas M Wallis, Atif (Atif) Imtiaz, Pavel Kabos
Abstract: Abstract: We present a technique for accurate wideband measurements of one-port devices with extreme impedances. Our technique uses a reflectometer with variable parameters (states) to obtain redundant measurements of the extreme impedance device. We ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900214

18. Recommended Terminology For Microwave Radiometry
Series: Technical Note (NIST TN)
Topic: Microwave Measurement Services
Published: 8/1/2008
Authors: James Paul Randa, Janne Lahtinen, Adriano Camps, A. Gasiewski, Martti Hallikainen, David Leine V, Manuel Martin-Neira, Jeff Piepmeier, Philip Rosenkranz, Christopher Ruf, James Shiue, Niels Skou
Abstract: We present recommended definitions for common terms in microwave remote-sensing radiometry. Terms are grouped into three chapters: General Terminology, Real-Aperture Radiometers, and Polarimetric Radiometry. AN alphabetical index lists the terms t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33079

19. Noise-parameter measurement with automated variable terminations
Topic: Microwave Measurement Services
Published: 6/8/2008
Authors: Dazhen Gu, David K Walker, James Paul Randa
Abstract: NIST has upgraded its measurement capability of noise parameters on low-noise amplifiers with a variable termination unit in the 1 to 12.4 GHz range. Such a unit allows improved time efficiency in the noise-temperature measurements used to de-embed n ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32879

20. SIMULATIONS OF NOISE-PARAMETER VERIFICATION USING CASCADE WITH ISOLATOR OR MISMATCHED TRANSMISSION LINE
Topic: Microwave Measurement Services
Published: 11/30/2007
Authors: James Paul Randa, Ken Wong, Roger Pollard
Abstract: Results are presented for simulations of a verification process for noise-parameter measurements. The verification process consists of first measuring separately both a passive device and the amplifier or transistor of interest (the DUT) and then mea ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32814



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