Publications

Displaying 126 - 150 of 431

A Significance Test for Reverberation-Chamber Measurement Uncertainty in Total Radiated Power of Wireless Devices

October 27, 2015

Author(s)

Catherine A. Remley, Chih-Ming Wang, Dylan F. Williams, Joop Aan Den Toorn, Christopher L. Holloway

We develop a significance test that determines whether the component of uncertainty due to the finite number of stepped mode-stirring samples or the component due to the lack of spatial uniformity dominates for a particular chamber set-up and stirring

Peer-to-Peer Urban Channel Characteristics for Two Public-Safety Frequency Bands

October 1, 2015

Author(s)

Catherine A. Remley, David W. Matolak, Camillo A. Gentile, Christopher L. Holloway, Qiong Wu, Qian Zhang

We report on ground-based wireless channel characteristics for an urban environment in two public safety bands. Results are based upon measurements taken in Denver in June 2009. The public safety bands we investigated are the 700 MHz and 4.9 GHz bands

Atom-based RF electric field measurements: An initial investigation of the measurement uncertainties

August 16, 2015

Author(s)

Christopher L. Holloway

We discuss a new method for the measurement of electric (E) fields that will lead to a self-calibrating, direct SI-traceable E-field probe. The technique is based on radio frequency field interactions with alkali atoms placed in glass cells. After we

Atom-Based RF Field Probe: From Self-Calibrated Measurements to Sub-Wavelength Imaging

July 27, 2015

Author(s)

Christopher L. Holloway

In this presentation, we discuss a fundamentally new approach for an electric (E) field probe design. This new approach is significantly different than currently used field probes in that it is based on the interaction of RF-fields with Rydberg atoms

Outdoor-to-Indoor Channel Dispersion and Power-Delay Profile Models for the 700 MHz and 4.9 GHz Bands

July 22, 2015

Author(s)

Catherine A. Remley, David W. Matolak, Christopher L. Holloway, Camillo A. Gentile

We present outdoor-to-indoor channel dispersion results based on measurements made in several representative urban environments. Root-mean-square delay spread values of less than 90 ns were extracted from measured power-delay profiles. We represent the

Effect of Vapor Cell Geometry on Rydberg Atom-based Radio-frequency Electric Field Measurements

July 15, 2015

Author(s)

Christopher L. Holloway, Joshua A. Gordon

A new approach to detect absolute radio-frequency (RF) electric fields (E-fields) that uses Rydberg atoms at room temperature in vapor cells has recently been demonstrated. The large transition dipole moments between energetically adjacent Rydberg states

HIGH-Q ON-CHIP MICROWAVE RESONATOR FOR SENSITIVE PERMITTIVITY DETECTION IN NANOLITER VOLUMES

June 21, 2015

Author(s)

A Padilla, Alex Watson, Christopher L. Holloway, James Booth

This work presents the design, fabrication and characterization results for a thick film (6µm Cu), coplanar waveguide (CPW) resonator operating at 2.2GHz with a high Q (177), integrated with a microfluidic channel. We demonstrate detection of changes in

Proximity-effect test for lossy wireless-device measurements in reverberation chambers

January 4, 2015

Author(s)

Catherine A. Remley, Joop Aan Den Toorn, Christopher L. Holloway, John M. Ladbury, Chih-Ming Wang

We present a test method for quantifying and reducing systematic errors arising from antenna proximity to lossy objects in over-the-air performance testing of lossy large-form-factor wireless devices. The method determines the extent to which antenna

Two-photon microwave transitions and strong-field effects in a room-temperature Rydberg-atom gas

October 29, 2014

Author(s)

Christopher L. Holloway, Joshua A. Gordon

We investigate two-photon transitions and strong-field effects on Rydberg atoms using Autler- Townes splitting of electromagnetically-induced transparency resonances in rubidium 85 atoms. We first drive the one-photon 62S1/2 - 62P3/2 transition for a

Parameter Estimation and Uncertainty Evaluation in a Low Rician K-Factor Reverberation-Chamber Environment

October 15, 2014

Author(s)

Chih-Ming Wang, Catherine A. Remley, Ansgar T. Kirk, Ryan J. Pirkl, Christopher L. Holloway, Dylan F. Williams, Paul D. Hale

In this paper we study statistical methods for estimating the Rician K-factor when this parameter is small. A fiducial approach for making statistical inference on the K-factor is discussed. The approach requires a Monte Carlo method to compute the

A Homogenization Technique for Obtaining Generalized Sheet Transition Conditions for an Arbitrarily Shaped Coated Wire Grating

October 6, 2014

Author(s)

Christopher L. Holloway, Edward Kuester

Using a multiple-scale homogenization method, we derive generalized sheet transition conditions (GSTCs) for an arbitrarily shaped coated wire grating. The parameters in these GSTCs are interpreted as effective electric and magnetic surface susceptibilities

Broadband Rydberg Atom-Based Electric-Field Probe for SI-Traceable, Self-Calibrated Measurements

September 25, 2014

Author(s)

Christopher L. Holloway, Joshua A. Gordon, Steven R. Jefferts, Thomas P. Heavner

We discuss a fundamental new approach for the measurement of electric (E) fields that will lead to the development of a broadband, SI-traceable, compact, self-calibrating E-field probe (sensor). This approach is based on the interaction of radio frequency

Absorption Characteristics and SAR of a Lossy Sphere inside a Reverberation Chamber

September 1, 2014

Author(s)

Christopher L. Holloway, Damir Senic, John M. Ladbury, Galen H. Koepke

This study presents an experimental approach to the analysis of absorption characteristics of a lossy dielectric object in a reverberant environment. The study used a canonically shaped water-filled sphere, convenient for ACS calculations (analytical or by

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