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Search Publications by: Dylan Williams (Fed)

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Displaying 476 - 500 of 583

Permittivity Characterization from Transmission-Line Measurement

June 1, 1997
Author(s)
Michael D. Janezic, Dylan F. Williams
We analyze three accurate broadband techniques for measuring the complex permittivity of dielectric substrates using coplanar waveguide transmission-line measurements and demonstrate good agreement with single-frequency cavity measurements.

Multiconductor Transmission Line Characterization

May 1, 1997
Author(s)
Dylan F. Williams
This paper presents a measurement method that completely characterizes lossy printed multiconductor transmission lines. It determines not only the matrices of impedances and admittances per unit length describing the transmission line in the conductor

Calibration in Multiconductor Transmission Lines

December 1, 1996
Author(s)
Dylan F. Williams
Abstract: This paper presents a calibration and measurement method for circuits embedded in lossy printed multiconductor transmission lines. The experimental results illustrate the complexity of the modal representation and the utility of the conductor

Modal Cross Power in Quasi-TEM Transmission Lines

November 1, 1996
Author(s)
Dylan F. Williams, F. Olyslager
This paper examines modal cross power in electromagnetic transmission lines. It shows that the cross powers of nearly degenerate modes may be large in quasi-TEM multiconductor transmission lines typical of modern electronic circuits at moderate and low

Thermal Noise in Lossy Waveguides

July 1, 1996
Author(s)
Dylan F. Williams
This work rigorously treats thermal electromagnetic noise in lossy waveguides and develops explicit modal equivalent­ circuit representations for the noise generated by arbitrary passive networks embedded in them. The results show that the formulations in

On-Wafer Measurement at Millimeter Wave Frequencies

June 1, 1996
Author(s)
Dylan F. Williams, J. M. Belquin, G. Dambrine, R. Fenton
We investigate millimeter wave on-wafer calibration and measurement in coplanar waveguide and demonstrate the applicability of the multiline thru-reflect-line calibration and good measurement repeatability between laboratories. We also investigate

Line-Reflect-Match Calibrations with Nonideal Microstrip Standards

December 1, 1995
Author(s)
Dylan F. Williams, J. B. Schappacher
We apply a previously developed Line-Reflect-Match (LRM) calibration that compensates for the nonideal electrical behavior of the match standard to microstrip transmission lines and investigate impedance definitions, standard parasitics, and calibration

Coaxial Line-Reflect-Match Calibration

October 1, 1995
Author(s)
Jeffrey A. Jargon, Roger Marks, Dylan F. Williams
We describe a coaxial line-reflect-match calibration that corrects for imperfections in the load used as a match standard. The method provides a practical means of obtaining accurate, wideband calibrations with compact coaxial standard sets. When our load

LRM Probe-Tip Calibrations Using Nonideal Standards

February 1, 1995
Author(s)
Dylan F. Williams, Roger Marks
The line-reflect-match calibration is enhanced to accommodate imperfect match standards and lossy lines typical of monolithic microwave integrated circuits. We characterize the match and line standards using an additional line standard of moderate length
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