2015-2020 Bilkent University, Faculty of Engineering, Ankara, Turkey

Bachelor of Science degree from Electrical and Electronics Engineering Department; CGPA 3.49/4.00

2020-Continuing Bilkent University, Faculty of Engineering, Ankara, Turkey

Continuing Master of Science student in Electrical and Electronics Engineering Department; CGPA 3.51/4.00

Fall 2020/Spring 2021: Analog Electronics Teaching Assistant

• I attended laboratory sections and helped students with their lab work.

• At the end of each laboratory session, I conducted interviews by asking questions from the lectures and lab work.

Fall 2021/Spring 2022/Fall 2022/Spring 2023: Engineering Electromagnetics Head Teaching Assistant

• I arranged seating plans and proctors for quizzes, midterm, and final exams.

• I graded quizzes and answered questions during recitation hours for each quiz.

• I helped students with their term projects.

• I organized a term project demonstration event and graded projects with professors and other teaching assistants.

Undergraduate Research

During the undergraduate years of my education, I focused on electromagnetics courses. I have taken engineering electromagnetics, antenna engineering, and microwave engineering courses.

In the antenna engineering course, I designed a pyramidal horn antenna using MATLAB Antenna Toolbox. This designed antenna was fabricated using recycled materials. As a first experiment, the S-parameters of this antenna was measured using Vector Network Analyzer. After that, radiation pattern measurements were taken in the anechoic chamber. A report was prepared with simulation and experimental results.

In the microwave engineering course, I designed a microstrip low-pass filter. First, the filter was designed using lumped elements. Then, lumped elements were converted to transmission lines. Simulations were conducted using ADS. The filter was fabricated using PCB technology, and a report was prepared.

Graduate Research

During the graduate years, I started my research by learning CST Microwave Studio and Ansys HFSS. Then, I started to search metasurfaces and metamaterial absorbers in the literature. I duplicated many papers to intensify my knowledge of CST and HFSS.

As a first research project, I designed an optically-non transparent FR-4-based metamaterial absorber. While designing it, I parametrized the design and conducted parametric sweeps to reach the highest bandwidth and lowest thickness. I fabricated this design using PCB technology.

After this first design was fabricated, I focused on understanding free space measurement. To measure RF absorption, I started to fabricate my own antennas. First, a Vivaldi antenna was designed using CST. This antenna was fabricated using PCB technology as well. I took initial measurements with this Vivaldi antenna and the fabricated absorber. I designed horn and double-ridged horn antennas to learn other types of antennas and take free space measurements with different antennas. These antennas were simulated using CST and fabricated by FDM technology. To fabricate the antennas using 3D printing, antennas were drawn in Solidworks. After the antennas were 3D fabricated, they were coated with copper spray and copper tapes. Free-space measurement was conducted with all these antennas.

As a second part of the research, I designed, simulated, and fabricated an optically transparent metamaterial absorber. To fabricate the antenna, first, a dielectric layer was chosen. Permittivity and permeability of dielectric were measured by a waveguide measurement system. To fabricate other layers, PET layers were coated with ITO using sputtering. Patterns were created on PET-coated ITO layers by laser etching. After fabrication was completed, free space measurement was conducted for the RF characteristics of the absorber. Permittivity and permeability were derived from S-parameters. Lastly, an equivalent circuit model of the absorber was designed and simulated using ADS.

OPTICALLY TRANSPARENT METAMATERIAL ABSORBER (under review or revision)

Abstract

RF metamaterial absorbers have attracted interest owing to their expanded bandwidth and reduced thickness. In practice, structures providing optical transparency are commonly preferred since they can absorb radio frequency [RF] signals in desired bands while satisfying high visible light transmission. One major challenge is obtaining ultrawideband metamaterial structures for different polarization and incident angles. This article presented an optically transparent metamaterial absorber made of a single layer of polymethyl methacrylate and a double layer of indium-tin-oxide (ITO) films. Our absorber is designed as a pixelated metasurface and further optimized by generic algorithms. The structure showed more than 90% absorption in the band from 4.2 to 11.2 GHz. Due to the symmetric nature of the proposed structure, we achieved polarization insensitiveness. Without any compensation layer, our results showed more than 90% absorption for incident angles up to 45° for TE and up to 60° for TM polarizations. This proposed absorber is an ideal candidate for stealth applications due to its high transparency, polarization and incident angle insensitivity and reduced thickness.