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Electronics

Electromagnetics

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Displaying 226 - 250 of 1580

650 GHz bistatic scattering measurements on human skin

June 9, 2014
Author(s)
Richard A. Chamberlin, Natalie P. Mujica-Schwahn, Erich N. Grossman
Many groups are developing submillimeter cameras that will be used to screen human subjects for improvised explosive devices (IEDs) and other threat items hidden beneath their clothing. To interpret submillimeter camera images the scattering properties

Absorptive Limiter for Frequency Selective Circuits

June 1, 2014
Author(s)
Juan C. Collado Gomez, Eduard Rocas, James C. Booth, Jordi Mateu, J. M. O'Callaghan, J. Verdu, A. Hueltes
This paper describes a novel absorptive limiter for frequency selective circuits. The proposed circuit allows the design of absorptive limiters based on a bi-state phase shifter, which is appropriate for integration into channelizing devices, such as

Traceability for Millimeter and Submillimeter-Wave Power Measurements

May 21, 2014
Author(s)
Ronald A. Ginley
The need for traceable power measurements above 110 GHz is well established for use in communications, spectral line investigation, molecular particle signature identification, material property characterization and others. There have been incremental

A Two-Port Model for Antennas in an Arbitrary Environment

May 1, 2014
Author(s)
Jason B. Coder, John M. Ladbury, Mark Golkowski
We present an improved model for characterizing fundamental antenna parameters based on the concept of a passive realizable two-port network. The proposed model is consistent with circuit theory based approaches and allows for quantitative description and

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

International Comparison of Ku-band Standard Gain Horn Characterization

April 6, 2014
Author(s)
Jeffrey R. Guerrieri
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

Exploiting dimensionality and defect mitigation to create tunable microwave dielectrics

October 23, 2013
Author(s)
Nathan D. Orloff, C H. Lee, T Birol, J A. Mundy, V. Goian, R. Haislmaier, E. Vlahos, Y. Kim, J. D. Brock, Y Zhu, R. Uecker, V. Gopalan, S. Kamba, X X. Xi, D A. Muller, I. Takeuchi, James C. Booth, C. J. Fennie
The miniaturization and integration of frequency-agile microwave circuits—tunable filters, resonators, phase shifters and more—with microelectronics offers tantalizing device possibilities, yet requires thin films whose dielectric constant at GHz

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)

On the Link Between Insertion Loss and Lower Bound of Efficiency

August 9, 2013
Author(s)
Levon Barsikyan, Jason Coder, Mark Golkowski, John M. Ladbury
We investigate the effect of chamber loss on the recently developed 2-port antenna model and the associated method of determining antenna efficiency. The loss in the reverberation chamber was controlled using microwave absorbing foam creating four

Introduction to Special Issue Honoring Dr. Clayton R. Paul

August 1, 2013
Author(s)
Christopher L. Holloway
Dr. Paul’s unique insight into the topics covered in these five papers and in many other areas in EM and EMC, will be missed. We are all tremendously grateful to Dr. Paul. He was invaluable to us personally and to many others in promoting the understanding

Performance of BAW Resonators at Cryogenic Temperatures

July 21, 2013
Author(s)
Eduard Rocas, C. Collado, Jordi Mateu, A Hueltes, J. Verdu, Robert Aigner, James Booth
In this work we go beyond the usual temperature range for commercial applications and explore the functioning of Bulk Acoustic Wave (BAW) resonators down to cryogenic temperatures, to get the whole picture at understanding the physical tendency of the main

G-band micro-fabricated frequency-steered arrays with 2deg/GHz beam steering

July 17, 2013
Author(s)
Leonardo M. Ranzani, Daniel G. Kuester, Kenneth Vanhille, Anatoliy Boryssenko, Erich N. Grossman, Zoya Popovic
In this paper, we describe micro-fabricated frequency-scanned slot waveguide arrays operating between 130 and 180 GHz for planetary landing radar. The group delay dispersion of the feed line is increased by corrugating the bottom rectangular waveguide wall

Characterizing Large-Form-Factor Devices in a Reverberation Chamber

July 15, 2013
Author(s)
Catherine A. Remley, Gerrit S. van de Beek, Christopher L. Holloway, John M. Ladbury
Abstract—With new technologies such as machine-to-machine communications there is a growing need to test large-formfactor devices in reverberation chambers. The performance of the reverberation chamber can be degraded by the physical characteristics of

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.

Radio-Frequency and DC Electrical Characterization on a Modular MEMS Mechanical Test Platform for Nanomaterials

June 16, 2013
Author(s)
J. J. Brown, Thomas Mitchell (Mitch) Wallis, Pavel Kabos, Kristine A. Bertness, Norman Sanford, Victor Bright
In order to enable radio frequency (RF) data collection from a micromechanical system designed to strain nanomaterials, a coplanar electrical waveguide has been integrated with an actuated microscale stage. RF (100 MHz to 20 GHz) admittance measurements
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