Doctoral Dissertations


Songping Wu


"A new sensor based on the novel concept of coaxial cable Bragg grating (CCBG) has been developed for the integrity of civil infrastructure monitoring. In this dissertation work, fundamental research is conducted in sensor modeling and applications, which correspond to the first four papers of the dissertation. A coupled mode theory (CMT) is first applied to establish a physics-based model for CCBG. A numerical solution of the coupled wave equations for CCBG has been derived and validated. As an indicator of sensor sensitivity, the quality factor (Q-factor) of CCBG as a function of sensor structural/material parameters was analytically investigated by CMT. However, the Q factor of the resonance of the signal spectrum was proved to be low. A positive feedback analogue oscillator system is developed to enhance the CCBG sensor sensitivity by 3500 times. Then an application of CCBG sensor to liquid level and liquid leakage detection is demonstrated experimentally. Noise coupling issues in printed circuit boards (PCBs), the second part of the thesis work, include the last three papers in the dissertation. Crosstalk among vias, as a significant problem in high-speed multilayer PCBs, is analytically predicted based on an infinite parallel plane assumption. Then the crosstalk between two non-parallel striplines on adjacent layers is investigated and modeled by an equivalent per unit length model with empirical formulas as a function of various geometric parameters. The physical mechanism of noise coupling from switching power supply to neighboring signal nets is investigated by a hybrid nonlinear model that combines the buck converter circuit and passive PCB model and PCB-level design guidelines are provided"--Abstract, page iv.


Fan, Jun, 1971-

Committee Member(s)

Drewniak, James L.
Pommerenke, David
DuBroff, Richard E.
Beetner, Daryl G.
Hale, Barbara N.


Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering


Missouri University of Science and Technology

Publication Date



xv, 177 pages

Note about bibliography

Includes bibliographical references.


© 2011 Songping Wu, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Subject Headings

Coaxial cables -- Testing
Bragg gratings
Signal integrity (Electronics)
Electromagnetic compatibility
Electronic circuits -- Noise
Crosstalk -- Prevention

Thesis Number

T 10180

Print OCLC #


Electronic OCLC #