The design and additive manufacture of gradient dielectrics for RF devices
Date
2024
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Publisher
University of Delaware
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 historically 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.
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Keywords
Additive manufacturing, Gradient dielectrics, Radio frequency, Fused Filament Fabrication, Effective medium theory