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Electronics

Electromagnetics

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Displaying 351 - 375 of 1580

Progress Toward Corrugated Feed Horn Arrays in Silicon

December 16, 2009
Author(s)
Joseph W. Britton, Ki W. Yoon, James A. Beall, Daniel T. Becker, Hsiao-Mei Cho, Gene C. Hilton, Michael D. Niemack, Kent D. Irwin
We are developing monolithic arrays of corrugated feed horns fabricated in silicon for dual-polarization single mode operation at 90, 145 and 220 GHz. The arrays consist of hundreds of platelet feed horns assembled from gold coated stacks of micromachined

Experimental Verification of Z Antennas at UHF Frequencies

December 8, 2009
Author(s)
Christopher L. Holloway, Richard Ziolkowski, Peng Jin, J. A. Nielsen, M. H. Tanielian
Both 300 MHz and 570 MHz versions of the electrically small coaxially-fed Z antenna were designed and tested. These two cases demonstrate the ability to change the resonance frequency of the Z antenna by changing the value of its lumped element inductor

Nonlinear calibration of polarimetric radar cross section systems

November 4, 2009
Author(s)
Lorant A. Muth
Polarimetric radar cross section systems are characterized by polarimetric system parameters $\epsilon_h$ and $\epsilon_v$. These parameters can be obtained with the use of rotating dihedrals. The full polarimetric dataset as a function of the angle of

Internal Resistance of Voltage Source Using the FDTD Technique

November 2, 2009
Author(s)
Ae-kyoung Lee
The introduction of the internal resistance of a voltage source is a very effective method for analyzing the electromagnetic characteristics of antennas and microstrip devices using the FDTD technique. However, some trial and error could be accompanied for

A Discussion on the Interpretation and Characterization of Metafilms/Metasurfaces: The Two-Dimensional Equivalent of Metamaterials

October 1, 2009
Author(s)
Christopher L. Holloway, Andrew M. Dienstfrey, Edward E. Kuester, John F. O'Hara, Abul K. Azad
A metafilm is the surface equivalent of a metamaterial. More precisely, a metafilm is a surface distribution of suitably chosen electrically small scatterers. Metafilms are becoming popular as an alternative to the full three-dimensional metamaterials

Micromachined resonators of high Q-factor based on atomic layer deposited alumina

September 24, 2009
Author(s)
Atif A. Imtiaz, Yuan-Jen Chang, Jason M. Gray, Dragon Seghete, Steven George, Thomas Mitchell (Mitch) Wallis, Pavel Kabos, Charles T. Rogers, Victor M. Bright
In this paper, atomic layer deposited (ALD) alumina (Al2O3) has been demonstrated as the structural material for a micro-resonator for the first time.  An electrostatically actuated micro-bridge made of chromium (Cr) coated ALD Al2O3 was used as a

Electromagnetic Fields in Cavities: Deterministic and Statistical Theories

September 21, 2009
Author(s)
David A. Hill
This book covers both deterministic and statistical theories of electromagnetic fields in cavities. Deterministic theory is based on resonant mode characteristics, such as quality factor, Q, and mode excitation via Dyadic Green s functions. Statistical

Unified Model for Bulk Acoustic Wave Resonators Nonlinear Effects

September 20, 2009
Author(s)
Eduard Rocas, Juan C. Collado Gomez, James C. Booth, Enrique Iborra, Robert Aigner
We present a nonlinear model for Bulk Acoustic Wave resonators that combines different sources of nonlinearity, using device-independent material specific parameters, to predict the intermodulation and harmonics generation. The actual model accounts for

Electromagnetic Penetration Studies for Three Different Aircraft

August 17, 2009
Author(s)
Chriss A. Grosvenor, David R. Novotny, Dennis G. Camell, Galen H. Koepke, Robert Johnk, Nino Canales
The National Institute of Standards and Technology has completed penetration studies on three different aircraft for the Federal Aviation Administration. These studies are used to understand cavity coupling characteristics between antennas placed at

Design and Experimental Verification of a 3D Magnetic EZ Antenna at 300 MHz

August 11, 2009
Author(s)
Christopher L. Holloway, Richard Ziolkowski, Chia-Ching Lin, J. A. Nielsen, M. H. Tanielian
Several variations of a 300 MHz version of the electrically small coax-fed three-dimensional (3D) magnetic EZ antenna were designed and tested. The final design was achieved when the impact of the fabrication techniques on its parameters were understood

Time-Domain Free-Field Measurements of the Relative Permittivity of Building Materials

June 10, 2009
Author(s)
Chriss A. Grosvenor, Robert Johnk, James R. Baker-Jarvis, Michael D. Janezic, Billy F. Riddle
Free-field measurements were made on several materials using dual-ridged guide antennas and 1 m x 1 m samples placed on an optical table loaded with absorber. The samples were polycarbonate, gypsum, plywood, a brick wall, and a concrete wall. This paper

Integrated Broadband Lumped-Element Symmetrical-Hybrid N-way Power Dividers

June 7, 2009
Author(s)
Mike Elsbury, Paul D. Dresselhaus, Samuel P. Benz, Zoya Popovic
This paper presents a monolithically-integrated, broadband, lumped-element, symmetrical-hybrid power divider centered at 20 GHz which was designed and fabricated to uniformly distribute power to arrays of Josephson junctions for superconducting voltage

AIR-BRIDGE INTEGRATED STUB FILTER FOR SUB-MILLIMETER WAVE APPLICATIONS

June 1, 2009
Author(s)
Dazhen Gu, Fernando Rodriquez-Morales, Sigfrid Yngvesson
We report a coplanar waveguide notch filter with an integrated air-bridge, designed for operation at sub-millimeter wave frequencies and cryogenic temperatures. The filter is built with a planar slot- ring antenna, which is in turn loaded with a su

Characterization of a Metafilm/Metasurface

June 1, 2009
Author(s)
Christopher L. Holloway, Andrew M. Dienstfrey, Edward E. Kuester
A metafilm (also referred to as a metasurface) is the surface equivalent of a metamaterial. More precisely, a metafilm is a surface distribution of suitably chosen electrically-small scatterers. Metafilms are becoming popular as an alternative to full

Near-Field Spherical Scanning: Quiet-Zone Field Evaluation

June 1, 2009
Author(s)
Randy Direen, Michael H. Francis, Ronald C. Wittmann
Spherical near-field scanning measurements are used to determine the incident electromagnetic fields within a test volume. Results from two independent approaches are compared and found to agree within estimated uncertainties.

Uncertainty Analysis for Noise-Parameter Measurements at NIST

April 9, 2009
Author(s)
James P. Randa
The uncertainty analysis is presented for NIST measurements of noise parameters of amplifiers and transistors, in both connectorized (coaxial) and on-wafer environments. We treat both the X-parameters, which are based on the wave representation of the

DC Internal Inductance for a Conductor of Rectangular Cross Section

April 3, 2009
Author(s)
Christopher L. Holloway, Edward Kuester
In this paper, the DC internal inductance for conductors with rectangular cross-section is investigated. Using a quasistatic Green's function, the magnetic fields inside a rectangular conductor are derived. These magnetic field expressions are used to

Variable Termination Unit for Noise-Parameter Measurements

April 1, 2009
Author(s)
Dazhen Gu, Dave K. Walker, James P. Randa
NIST has upgraded its measurement capability of noise parameters on low-noise amplifiers with a variable termination unit (VTU) in the 1 to 12.4 GHz frequency range. Such a unit allows improved time efficiency and accuracy in the noise-temperature
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