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REALIZATIONS OF DEGENERATE BAND EDGE/MAGNETIC PHOTONIC CRYSTALS FOR ANTENNA APPLICATIONS
Yarga, Salih

2009, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
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 part
of the dissertation (chapters 3-5) is aimed at demonstrating the DBE mode and its
utilization 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.
John L. Volakis (Advisor)
Jin-Fa Lee (Committee Member)
Robert Lee (Committee Member)
Kubilay Sertel (Committee Member)

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Yarga, S. (2009). REALIZATIONS OF DEGENERATE BAND EDGE/MAGNETIC PHOTONIC CRYSTALS FOR ANTENNA APPLICATIONS. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

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Yarga, Salih. "REALIZATIONS OF DEGENERATE BAND EDGE/MAGNETIC PHOTONIC CRYSTALS FOR ANTENNA APPLICATIONS." Electronic Thesis or Dissertation. Ohio State University, 2009. OhioLINK Electronic Theses and Dissertations Center. 23 Nov 2017.

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Yarga, Salih "REALIZATIONS OF DEGENERATE BAND EDGE/MAGNETIC PHOTONIC CRYSTALS FOR ANTENNA APPLICATIONS." Electronic Thesis or Dissertation. Ohio State University, 2009. https://etd.ohiolink.edu/

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