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You searched on: Topic Area: Microwave Measurement Services

Displaying records 21 to 30 of 35 records.
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21. Contactless Approaches for RF Characterization of Metallic Nanowires
Topic: Microwave Measurement Services
Published: 9/28/2010
Authors: Kichul Kim, Paul Rice, Thomas M Wallis, SangHyun S. Lim, Dazhen Gu, Atif A. Imtiaz, Pavel Kabos, Dejan Filipovic
Abstract: Two approaches for microwave characterization of nanowire (NW) conductivity are described in this paper. To remove the uncertainty associated with contacts, the NWs are either suspended above the center conductor of a coplanar waveguide (CPW) host or ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905930

22. 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

23. 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

24. Full-wave Evaluation of Carbon Nanotubes as Microwave Interconnects
Topic: Microwave Measurement Services
Published: 7/25/2010
Authors: Kichul Kim, Paul Rice, Pavel Kabos, Dejan Filipovic
Abstract: Microwave interconnect configurations composed of single wall carbon nanotubes (CNTs) are studied in this paper. Specifically, an atomic layer deposition (ALD) enabled nano-coaxial line with individual CNTs comprising the inner conductor, CNT Goubau ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905332

25. Near-Field Antenna as a Scanning Microwave Probe for Characterization of Materials and Devices
Topic: Microwave Measurement Services
Published: 4/12/2010
Authors: Atif A. Imtiaz, Thomas M Wallis, SangHyun S. Lim, Jonathan Chisum, Zoya Popovic, Pavel Kabos
Abstract: The Scanning Microwave Probe (SMP) is emerging as an important broadband metrology tool for characterizing the materials and devices in the micron and sub-micron length scales in the frequency range of 10 MHz to 110 GHz. In this document we establis ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905030

26. Wideband measurement of extreme impedance with a multistate reflectometer
Topic: Microwave Measurement Services
Published: 12/12/2008
Authors: Arkadiusz C. 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

27. 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

28. 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

29. 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

30. Simulations of Noise-Parameter Uncertainties
Topic: Microwave Measurement Services
Published: 6/7/2002
Author: James Paul Randa
Abstract: This paper reports results for uncertainties obtained using a Monte Carlo simulation of noise-parameter measurements. The simulator permits the computation of the dependence of the uncertainty in the noise parameters on uncertainties in the underlyin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=24469



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