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You searched on: Topic Area: Microwave Measurement Services

Displaying records 1 to 10 of 16 records.
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1. Dielectric characterization by microwave cavity perturbation corrected for non-uniform fields
Topic: Microwave Measurement Services
Published: 7/23/2014
Authors: Nathan D Orloff, Jan Obrzut, Christian John Long, Thomas F. Lam, James C Booth, David R Novotny, James Alexander Liddle, Pavel Kabos
Abstract: The non-uniform fields that occur due to the slot in the cavity through which the sample is inserted and those due to the sample geometry itself decrease the accuracy of dielectric characterization by cavity perturbation at microwave frequencies. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915011

2. Colored Noise and Regularization Parameter Selection for Waveform Metrology
Topic: Microwave Measurement Services
Published: 7/8/2014
Authors: Andrew M Dienstfrey, Paul D Hale
Abstract: We study six regularization parameter selection algorithms applied to deconvolution problems relevant for characterization of high-speed communication measurement systems. In particular we investigate the performance of these selectors in the presen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913790

3. Analysis for Dynamic Metrology
Topic: Microwave Measurement Services
Published: 1/30/2014
Authors: Andrew M Dienstfrey, Paul D Hale
Abstract: Diverse measurement contexts require estimates of time varying quantities. Ideally the measurement device responds to signal variations significantly more rapidly than the modulation of the signal itself. If so, then well-developed techniques may b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914865

4. 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

5. 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

6. 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

7. 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 A. 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

8. 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

9. 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

10. Radiometer Measurements of a Near-Ambient, Variable-Temperature Noise Standard
Topic: Microwave Measurement Services
Published: 6/7/2004
Authors: George Free, James Paul Randa, Robert L. Billinger
Abstract: A near-ambient, variable-temperature noise standard whose physical temperature can be accurately measured was constructed and then measured with the NIST total-power radiometer to test the accuracy of radiometer measurements in the temperature range ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31593



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