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Displaying 476 - 500 of 1400

Dielectric characterization by microwave cavity perturbation corrected for non-uniform fields

July 23, 2014
Author(s)
Nathan D. Orloff, Jan Obrzut, Christian J. Long, Thomas F. Lam, James C. Booth, David R. Novotny, James A. Liddle, Pavel Kabos
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. To

Energy Harvesting from the Human Leg Motion

July 23, 2014
Author(s)
Kamran Sayrafian, Antonio M. Possolo, Nathalie Yarkony
Kinetic energy harvested from the human body motion seems to be one of the most attractive and convenient solution for wearable wireless sensors in healthcare applications. Due to their small size, such sensors typically have a very limited battery-powered

Colored Noise and Regularization Parameter Selection for Waveform Metrology

July 8, 2014
Author(s)
Andrew M. Dienstfrey, Paul D. Hale
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 presence of

Inter-BAN Interference Mitigation: A Correlated Equilibrium Perspective

June 13, 2014
Author(s)
Vladimir Marbukh, Kamran Sayrafian, Martina Barbi, Mehdi Alasti
A Body Area Network (BAN) is a wireless network of wearable or implantable computing devices. A BAN typically consists of several miniaturized radio-enabled body sensor/actuator that communicate with a single coordinator. Medical applications usually

A Prescription for THz Transistor Characterization

April 4, 2014
Author(s)
Dylan F. Williams
Advances in microwave wafer probes and vector network analyzers have opened up a whole new world of discovery in microwave metrology, making possible accurate on-wafer measurements in printed transmission lines at microwave, millimeter-wave, sub-millimeter

Calibrations for Millimeter-Wave Silicon Transistor Characterization

March 1, 2014
Author(s)
Dylan F. Williams, Phillip Corson, Sharma Jahnavi, Krishnaswamy Harish, Wei Tai, George Zacharias, Ricketts David, Watson Paul, Dacquay Eric, Voinigescu Sorin
This paper compares on-wafer thru-reflect-line (TRL) and off-wafer short-open-load-thru (SOLT) and line-reflect-reflect-match (LRRM) vector-network-analyzer probe-tip calibrations for amplifier characterization and parasitic-extraction calibrations for

A four-pixel single-photon pulse-position array fabricated from WSi superconducting nanowire single- photon detectors

February 3, 2014
Author(s)
Varun B. Verma, Robert D. Horansky, Francesco Marsili, Jeffrey Stern, Matthew Shaw, Adriana E. Lita, Richard P. Mirin, Sae Woo Nam
We demonstrate a scalable readout scheme for an infrared single-photon pulse-position camera consisting of WSi superconducting nanowire single-photon detectors. For an N × N array, only 2 × N wires are required to obtain the position of a detection event

Analysis for Dynamic Metrology

January 30, 2014
Author(s)
Andrew M. Dienstfrey, Paul D. Hale
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 be used

Greedy Backpressure Routing for Smart Grid Sensor Networks

January 13, 2014
Author(s)
Hamid Gharavi
In this paper, a greedy backpressure routing protocol is proposed for multigate mesh networks. This protocol evaluates the greedy backpressure metric (GBM) value of mesh points and routes packets in the direction of the steepest gradient. The GBM value is

10 TOhm and 100 TOhm High Resistance Measurements at NIST

September 25, 2013
Author(s)
Dean G. Jarrett, Marlin E. Kraft
The measurement techniques, standards, and bridges used to calibrate standard resistors in the 10 TΩ to 100TΩ range at NIST are described. Standard resistors, guarded Hamon transfer standard, and 10:1 and 100:1 bridge ratios, were used to provide multiple

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
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