Dissertation Defense Schedule
Academic Excellence
Sharing original dissertation research is a principle to which the University of Delaware is deeply committed. It is the single most important assignment our graduate students undertake and upon completion is met with great pride.
We invite you to celebrate this milestone by attending their dissertation defense. Please review the upcoming dissertation defense schedule below and join us!
PROGRAM | Electrical & Computer Engineering
The Design and Additive Manufacture of Gradient Dielectrics for RF Devices
By: Theodore Fessaras Chair: Mark Mirotznik
ABSTRACT
Gradient dielectrics have emerged as effective constructs for the design and optimization of broadband radio frequency (RF) devices. Their ability to enhance performance and reduce physical footprints is exemplified in applications such as high-gain lenses, graded antenna substrates, and passive beam-steering systems. Despite their potential, intricate design and fabrication complexities have impeded their practical implementation. Within the last decade, a breakthrough occurred with the advent of modern additive manufacturing (AM). Fused Filament Fabrication (FFF) particularly has proven to be a transformative tool for enabling gradient electromagnetic (EM) material properties, capitalizing on the principles of effective medium theory. In this body of work, I delve into the extended applications of FFF for RF design by exploring novel fabrication and design methodologies.
The first study involves the development of a hopper-fed FFF system tailored for high dielectric loaded polymer filaments. It addresses manufacturing challenges associated with traditional systems, presenting an alternative desktop-scale FFF system. The second study introduces a computational design algorithm, leveraging polar-lattice unit cells to exploit rotationally symmetric gradient dielectric structures. Finally, this work culminates in the presentation of a 3D wide-angle, gradient dielectric lens developed for passive beam-steering applications. By bridging the gap between theory and implementation, this research underscores the practical utility of gradient dielectrics for more efficient and versatile RF applications.
The Process
Step-by-Step
Visit our “Step-by-Step Graduation Guide” to take you through the graduation process.From formatting your Dissertation to Doctoral Hooding procedures.
Dissertation Manual
Wondering how to set up the format for your paper. Refer to the “UD Thesis/Dissertation Manual” for formatting requirements and more.
Defense Submission Form
This form must be completed two weeks in advance of a dissertation defense to meet the University of Delaware Graduate and Professional Education’s requirements.
