Spark Plasma Sintering is one of the most effective tools in modern sintering history. Since the discovery of superconductivity in MgB 2 , there has been great interest in this atmospheric pressure-based material. In this paper, the effect of sintering temperature on superconduc…
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Electromagnetic shielding is becoming more and more important with the abundance of wireless devices. Therefore a need has arisen for more versatile, flexible and low-cost solutions for shielding. For these requirements, carbon microfiber material has been proposed for electroma…
In this thesis, two new types of electrically small feed antennas, slotted circular waveguide feeds, and microstrip dipole feeds are designed and studied for prime focus reflectors. The existing electrically small feeds used in prime focus reflectors exhibit some limitations suc…
This thesis deals with the theory and design of a hemispherical antenna array circuit that is capable to operate in the intermediate zones. By doing that, this array can be used in Hyperthermia Treatment for Brain Cancer in which the aim is to noninvasively focus the fields at m…
Magnetic field - plasma interaction occurs in a wide variety of systems, from plasmas in space to plasmas in the laboratory. Magnetic fields push and penetrate plasmas. Pushing is expected to dominate when plasma resistivity is low, and penetration by diffusion is expected to do…
I performed a systematic study on Co/Sb superlattices varying Antimony (Sb) thickness keeping Cobalt (Co) thickness constant at 1 nm. Here I studied the decay of resistivity of those samples. To make those samples I deposited 10 bilayers of Co and Sb at 500° C on <100> face of s…
An antenna radiates when a time rate of change of signal arrives at the structure from a generator, after travelling through a transmitting medium. THz radiation in a photoconductive semiconductor switches (PCSS) follows the same principles. Here the signal is produced by the ph…
TiO2 nanotube arrays are promising candidates for applications such as photocatalysis and for potential employment in spin-electronic (spintronic) devices. The functionality of TiO2 -based nanotubes is highly dependent on their structure (microstructure and crystallographic symm…
The propagation of optical vortices (OVs) in linear and nonlinear media is an important field of research in science and engineering. The most important goal is to explore the properties of guiding dynamics for potential applications such as sensing, all-optical switching, frequ…
Eighth grade Turkish students' mental models about the nature of magnets and magnetic interactions were examined in this research study. Using an interpretive qualitative design, I conducted this study in a middle school with thirty-one Turkish students who have not had any form…
This body of work seeks to define Direct Spatial Antenna Modulation (DSAM) as a new and unique approach to data symbol modulation and phased array control by comparing and contrasting the technique to conventional approaches. A rigorous development of the theoretical and practic…
This thesis studies rain caused signal attenuation at 26 GHz and 32 GHz millimeter bands through concurrent rain rate and rain attenuation measurements. It is a collaboration project between Japan Institute of Information and Communications Technology (NICT), Japan Radio Corpora…
Novel metamaterial and metamaterial-inspired structures and microwave/antenna applications thereof are proposed and studied in this thesis. Motivated by the challenge of extending the applicability of metamaterial structures into practical microwave solutions, the underlying obj…
Extraordinary magnetoresistance (EMR) in semiconductor-metal hybrids has been studied exclusively for sensor applications. However, some properties of EMR-based devices are potentially advantageous for power applications. A PSPICE finite-element model has been developed to aid i…
The use of induction motors in modern industry become increasingly high. Induction motor starting phenomenon has an important impact on the industrial loads and dynamics of the power system. Induction motor consumes tremendous amount of reactive power during starting, resulting …
The mains current in an ac/dc converter contains periodic current pulses due to the action of rectifier and output filter capacitor. The high current peaks cause harmonic distortion of the supply current and low power factor. This results in a poor power quality, voltage distort…
3D additive printing technology has been employed recently for manufacturing of a wide variety of radio frequency (RF) circuits; particularly it is very attractive for composite manufactured structures in conformal (non-planar) shapes, such as magnetically tuned antenna arrays f…
This dissertation presents the design and performance analysis of five-phase ferrite permanent magnet assisted synchronous reluctance motor (Fe-PMaSynRM). The risk of irreversible demagnetization and mechanical deformation are two major challenges in the five-phase Fe-PMaSynRMs.…