2026-05-22T04:28:48Zhttps://keep.lib.asu.edu/oai/requestoai:keep.lib.asu.edu:node-1552352024-12-20T18:25:12Zoai_pmh:alloai_pmh:repo_items155235
https://hdl.handle.net/2286/R.I.42048
http://rightsstatements.org/vocab/InC/1.0/
All Rights Reserved
2017
91 pages
Doctoral Dissertation
Academic theses
Text
eng
Pandi, Sivaseetharaman
Balanis, Constantine A
Palais, Joseph
Aberle, James T., 1961-
Trichopoulos, Georgios
Arizona State University
Doctoral Dissertation Electrical Engineering 2017
Articially engineered two-dimensional materials, which are widely known as<br/><br/>metasurfaces, are employed as ground planes in various antenna applications. Due to<br/><br/>their nature to exhibit desirable electromagnetic behavior, they are also used to design<br/><br/>waveguiding structures, absorbers, frequency selective surfaces, angular-independent<br/><br/>surfaces, etc. Metasurfaces usually consist of electrically small conductive planar<br/><br/>patches arranged in a periodic array on a dielectric covered ground plane. Holographic<br/><br/>Articial Impedance Surfaces (HAISs) are one such metasurfaces that are capable of<br/><br/>forming a pencil beam in a desired direction, when excited with surface waves. HAISs<br/><br/>are inhomogeneous surfaces that are designed by modulating its surface impedance.<br/><br/>This surface impedance modulation creates a periodical discontinuity that enables a<br/><br/>part of the surface waves to leak out into the free space leading to far-eld radia-<br/><br/>tion. The surface impedance modulation is based on the holographic principle. This<br/><br/>dissertation is concentrated on designing HAISs with<br/><br/> Desired polarization for the pencil beam<br/><br/> Enhanced bandwidth<br/><br/> Frequency scanning<br/><br/> Conformity to curved surfaces<br/><br/>HAIS designs considered in this work include both one and two dimensional mod-<br/><br/>ulations. All the designs and analyses are supported by mathematical models and<br/><br/>HFSS simulations.
Electromagnetism
Beams forming
Holography
Leaky waves
Metasurfaces
Scan angle
Surface Waves
Holographic Metasurface Leaky Wave Antennas