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ndltd-OhioLink-oai-etd.ohiolink.edu-osu12536412482021-08-03T05:57:21Z REALIZATIONS OF DEGENERATE BAND EDGE/MAGNETIC PHOTONIC CRYSTALS FOR ANTENNA APPLICATIONS Yarga, Salih Dispersion engineered materials (new composites, electromagnetic bandgap, and periodic structures) have attracted considerable interest in recent years due to their unique electromagnetic properties. Included in this class of media are magnetic photonic crystals (MPC) characterized by 3rd order dispersion (referred to as stationary inflection point, SIP) in their K-w (band) diagrams. The related degenerate band edge (DBE) crystals provide 4th order dispersion in their K-w diagrams. These MPC and DBE crystals have been shown to support unique propagation modes that can not be realized with available materials. Unique properties of the modes are their slow propagation characteristics and highly resonant nature of the finite structures forming the crystals. However, the realization of volumetric MPC and DBE crystals is challenging since very low loss anisotropic materials needed in their construction are rather costly for practical purposes.This research focuses on the realization of artificial anisotropy and low-cost engineered periodic assemblies that yield the MPC and DBE modes. The first partof the dissertation (chapters 3-5) is aimed at demonstrating the DBE mode and itsutilization for antennas. Initially, this is achieved by constructing a stack of uniform layers. Each layer is then printed with a design of metallic strips to emulate the anisotropic behavior. A more sophisticated stack constructed of layers formed by alternating rods of Barium Titanate (BaTiO3) and Alumina (Al2O3) has a lower loss performance. In both cases, the crystals are used with embedded dipole antennas or feeds to demonstrate their superior gain characteristics. DBE structures are also considered with electrically small dimensions leading to a DRA type antenna that exhibits miniaturization and mode diversity.Chapter 6 introduces novel methods for realizing MPC crystals. We start by proposing stacks composed of two-tone dielectrics and ferrites. Embedded dipole performance is evaluated and the expected non-reciprocal behavior is demonstrated. The design is validated by constructing the MPC crystal using laminate layers of printed strips and ferrite layers. 2009 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1253641248 http://rave.ohiolink.edu/etdc/view?acc_num=osu1253641248 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
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NDLTD
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| language |
English
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NDLTD
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| author |
Yarga, Salih
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Yarga, Salih
REALIZATIONS OF DEGENERATE BAND EDGE/MAGNETIC PHOTONIC CRYSTALS FOR ANTENNA APPLICATIONS
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| author_facet |
Yarga, Salih
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| author_sort |
Yarga, Salih
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| title |
REALIZATIONS OF DEGENERATE BAND EDGE/MAGNETIC PHOTONIC CRYSTALS FOR ANTENNA APPLICATIONS
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| title_short |
REALIZATIONS OF DEGENERATE BAND EDGE/MAGNETIC PHOTONIC CRYSTALS FOR ANTENNA APPLICATIONS
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| title_full |
REALIZATIONS OF DEGENERATE BAND EDGE/MAGNETIC PHOTONIC CRYSTALS FOR ANTENNA APPLICATIONS
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| title_fullStr |
REALIZATIONS OF DEGENERATE BAND EDGE/MAGNETIC PHOTONIC CRYSTALS FOR ANTENNA APPLICATIONS
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| title_full_unstemmed |
REALIZATIONS OF DEGENERATE BAND EDGE/MAGNETIC PHOTONIC CRYSTALS FOR ANTENNA APPLICATIONS
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| title_sort |
realizations of degenerate band edge/magnetic photonic crystals for antenna applications
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| publisher |
The Ohio State University / OhioLINK
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| publishDate |
2009
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| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1253641248
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| work_keys_str_mv |
AT yargasalih realizationsofdegeneratebandedgemagneticphotoniccrystalsforantennaapplications
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| _version_ |
1719428381952442368
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