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Displaying 476 - 500 of 3124

Partial and Internal Inductance: Two of Clayton R. Paul's Many Passions

April 23, 2013

Author(s)

Christopher L. Holloway, Edward E. Kuester

Inductance is one of the fundamental defined parameters in electromagnetics and it takes on a variety of formulations and definitions in the electromagnetic compatibility (EMC) community. The concept of inductance in its many definitions, uses and caveats

Estimating Uncertainties in Antenna Measurements

April 8, 2013

Author(s)

Michael H. Francis

We describe general methods of estimating uncertainties in antenna measurements. These include estimates based on theory (analysis1), simulation, and altering the measurement system (self-coparison tests). The important component sources of uncertainty in

Performance Evaluation of a Robotically Controlled Millimeter-Wave Near-Field Pattern Range At the NIST

April 7, 2013

Author(s)

David R. Novotny, Josh Gordon, Jason Coder, Michael Francis, Jeffrey R. Guerrieri

The Antenna Metrology Laboratory at the National Institute of Standards and Technology, USA (NIST) is developing a robotically controlled near-field pattern range for measuring antennas and components from 50 GHz to 500 GHz. This new range is intended to

Correction to Comparison of Sub-Millimeter-Wave Scattering-Parameter Calibrations with Imperfect Electrical Ports

March 7, 2013

Author(s)

Dylan F. Williams

Corrections to the classical continuity boundary conditions at the interface of a composite medium

February 19, 2013

Author(s)

Christopher L. Holloway, Edward Kuester

Using the multiple-scales homogenization method, we derive generalized sheet transition conditions (GSTCs) for electromagnetic fields at the interface between two media, one of which is free-space and the other a certain type of composite material. We show

Polymer Membranes to Quarter-Wave Match Gaussian Optics

February 18, 2013

Author(s)

Jack T. Surek, Jason B. Coder, Joshua A. Gordon, David R. Novotny

We demonstrate that a simple quarter wave match designed for 110 GHz in WR10 waveguide reduces reflected power by a factor of ten at high density polyethylene (HDPE)-air interfaces. Polytetrafluoroethylene (PTFE)-based membranes that are expanded by

Measurement of orbital asymmetry and strain in Co 90 Fe 10 /Ni multilayers and alloys: Origins of perpendicular anisotropy

February 13, 2013

Author(s)

Justin M. Shaw, Hans T. Nembach, Thomas J. Silva

We use broadband ferromagnetic resonance spectroscopy and x-ray diffraction to investigate the fundamental origin of perpendicular anisotropy in Co 90Fe 10/Ni multilayers. By careful evaluation of the spectroscopic g-factor, we determine the orbital moment

Near-Field Scaning Microwave Microscope (NSMM)

December 31, 2012

Author(s)

Atif A. Imtiaz, Thomas M. Wallis, Pavel Kabos

Electromagnetic waves in the microwave frequency range are an essential tool for the investigation of material and device properties across a broad range of applications. Examples of materials of interest include: ferroelectric materials, ferromagnetic

Spherical Wave Scattering Matrix Description of Antenna Coupling in Arbitrary Environments

December 17, 2012

Author(s)

Ryan J. Pirkl

A framework is presented for investigating antenna coupling in arbitrary environments by way of antenna and environment scattering parameter matrices. The environment scattering parametermatrices are bona fide scattering parameters that describe the

Antenna-Environment Multiple Scattering in Reverberation Chamber Measurements

December 12, 2012

Author(s)

Ryan J. Pirkl, Catherine A. Remley

High-resolution synthetic aperture measurements in a reverberation chamber revealed the presence of multiple scattering between the scan antenna and the measurement environment. Casting the scan antenna-environment multiple scattering as an error term with

A Raytracing Model for Wireless Propagation in Tunnels with Varying Cross Section

December 3, 2012

Author(s)

Camillo A. Gentile, Fabien A. Valoit

Spurred by the 2006 Miner Act, reliable two-way communications in mines has drawn the interest of network engineers in recent years. Critical to the design of these systems is an accurate channel propagation model. Given the elementary geometry seen in

Comparison of Power Ratio and Vector Network Analyzer Techniques for Measuring Attenuation

November 30, 2012

Author(s)

Caitlin Chirgwin, Thomas P. Crowley, Weihai Fang, Denis X. LeGolvan

By using a power ratio technique, we have lowered our uncertainty for attenuation measurements by a factor of about 4 (typical) when compared to our vector network analyzer uncertainty analysis. The power ratio technique is applicable to insertable 2-port

A frequency-bandgap waveguide controlled with metafilms composed of cubic particles

November 20, 2012

Author(s)

Sung Kim, Christopher L. Holloway, Michael D. Janezic, Kendra L. Kumley, James R. Baker-Jarvis, Edward Kuester

We present a rectangular S-band waveguide having electromagnetic bandgap properties (stopbands) controlled with sheets of metafilms composed of ceramic particles, in which we present both analytic and experimental results. Metafilms composed of TiO("d)2

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