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Author: dylan williams

Displaying records 21 to 30 of 155 records.
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21. Electromagnetic Measurements for Counterfeit Detection of Radio-Frequency Identification Cards
Published: 5/2/2009
Authors: Henry Romero, Catherine A Remley, Dylan F Williams, Chih-Ming Wang
Abstract: We investigate a technique for counterfeit detection of radio-frequency identification cards based on the electromagnetic characteristics of the cards rather than the digital information that they transmit. We describe a method of measuring the elect ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33134

22. Characterization and Modeling or Random Vector-Network-Analyzer Measurement Errors
Published: 10/24/2008
Authors: Arkadiusz C. (Arkadiusz) Lewandowski, Dylan F Williams
Abstract: We present a technique for characterizing and modeling random vector-network-analyzer measurement errors. These errors manifest themselves as random changes or drift of vector-network-analyzer calibration coefficients. We model achange of calibrtion ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32950

23. Complete waveform characterization at NIST
Published: 6/8/2008
Authors: Paul D Hale, Tracy S. Clement, Darryl A. Keenan, Dylan F Williams, Arkadiusz C. (Arkadiusz) Lewandowski, C. M. Wang, Andrew Dienstfrey
Abstract: We present a method for calibrating the voltage a pulse generator delivers to a load at every point in the measured waveform epoch. The calibration includes an equivalent circuit model of the generator so that the user can calculate how the generator ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32878

24. The Beginnings of the Transactions
Published: 3/1/2008
Authors: Dylan F Williams, Admir Mortazawi
Abstract: In July, 1951, Ben Warriner (chairman, 1952-1953) circulated a petition to begin the Microwave Theory and Techniques Society under the auspices of the Institute of Radio Engineers. Despite an initial lack of support from the IRE, the roots of the Tra ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32865

25. Characterization of a 50 GHz Comb Generator
Published: 2/1/2008
Authors: Howard C. Reader, Dylan F Williams, Paul D Hale, Tracy S. Clement
Abstract: We characterize a 50 GHz comb generator measured on a sampling oscilloscope. With careful control of the input power, input harmonics and comb generator temperature, we find the output spectrum to be stable to 0.1 dB and 0.5 degrees. We correct resul ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32685

26. Absolute Magnitude and Phase Calibrations
Published: 10/1/2007
Authors: Catherine A Remley, Paul D Hale, Dylan F Williams
Abstract: In VNA measurements, the magnitude and phase of a transmitted or reflected wave are measured relative to that of the incident wave. VNA measurements are made a single frequency at a time and each frequency component is acquired relative to the intern ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32338

27. Chip-level Security for RFID Smart Cards and Tags
Published: 9/4/2007
Authors: Dylan F Williams, Catherine A Remley
Abstract: This report on RFID chip-level security is written to help both technical and non-technical audiences navigate the complex chip-level security features of RFID smart cards and tags, and make intelligent security choices. The report explores both atta ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32656

28. Systematic Error of the Nose-to-Nose Sampling-Oscilloscope Calibration
Published: 9/1/2007
Authors: Dylan F Williams, Tracy S. Clement, Catherine A Remley, Paul D Hale, F. Verbeyst
Abstract: We use traceable swept-sine and electrooptic-sampling-system-based-sampling-oscilloscope calibrations to measure the systematic error of the nose-to-nose calibration, and compare the results to simulations. Our results show that the errors in the nos ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32562

29. The Sampling Oscilloscope as a Microwave Instrument
Published: 8/1/2007
Authors: Dylan F Williams, Paul D Hale, Catherine A Remley
Abstract: Many modern high-speed oscilloscopes are well suited for precise microwave waveform, modulated-signal, and nonlinear measurements. These oscilloscopes have bandwidths of up to 100 GHz and are available with nominally 50 ? input impedances. Like their ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32637

30. RFID Devices and Systems in Homeland Security Applications
Published: 7/1/2007
Authors: Catherine A Remley, Jeffrey R Guerrieri, Dylan F Williams, David R Novotny, Anthony B Kos, Nelson Bryner, Nader Moayeri, Michael Souryal, Kang Lee, Steven Fick
Abstract: This article reports on activities being carried out by the National Institute of Standards and Technology to ensure secure, reliable use of Radio-Frequency Identification (RFID) technology in homeland security and public safety applications. These p ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32708



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  • SP 250-XX: Calibration Services
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