Karatay, Anıl

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https://hdl.handle.net/11147/16361
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01. Izmir Institute of Technology
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Former Staff
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Sustainable Development Goals

NO POVERTY1
NO POVERTY
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ZERO HUNGER2
ZERO HUNGER
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GOOD HEALTH AND WELL-BEING3
GOOD HEALTH AND WELL-BEING
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QUALITY EDUCATION4
QUALITY EDUCATION
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GENDER EQUALITY5
GENDER EQUALITY
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CLEAN WATER AND SANITATION6
CLEAN WATER AND SANITATION
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AFFORDABLE AND CLEAN ENERGY7
AFFORDABLE AND CLEAN ENERGY
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DECENT WORK AND ECONOMIC GROWTH8
DECENT WORK AND ECONOMIC GROWTH
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INDUSTRY, INNOVATION AND INFRASTRUCTURE9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
2
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REDUCED INEQUALITIES10
REDUCED INEQUALITIES
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SUSTAINABLE CITIES AND COMMUNITIES11
SUSTAINABLE CITIES AND COMMUNITIES
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RESPONSIBLE CONSUMPTION AND PRODUCTION12
RESPONSIBLE CONSUMPTION AND PRODUCTION
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CLIMATE ACTION13
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LIFE BELOW WATER14
LIFE BELOW WATER
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LIFE ON LAND15
LIFE ON LAND
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PEACE, JUSTICE AND STRONG INSTITUTIONS16
PEACE, JUSTICE AND STRONG INSTITUTIONS
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PARTNERSHIPS FOR THE GOALS17
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This researcher does not have a Scopus ID.
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Scholarly Output

13

Articles

8

Views / Downloads

7710/4748

Supervised MSc Theses

1

Supervised PhD Theses

1

WoS Citation Count

24

Scopus Citation Count

28

Patents

0

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0

WoS Citations per Publication

1.85

Scopus Citations per Publication

2.15

Open Access Source

6

Supervised Theses

2

JournalCount
Measurement Science and Technology2
2023 31st Signal Processing and Communications Applications Conference, SIU1
AEU - International Journal of Electronics and Communications1
AEU-International Journal of Electronics and Communications1
IEEE Transactions on Instrumentation and Measurement1
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Scholarly Output Search Results

Now showing 1 - 10 of 13
  • Article
    Citation - WoS: 4
    Citation - Scopus: 4
    Electromagnetic Simulations of Mechanical Imperfections for Accelerator Cavities
    (Institute of Electrical and Electronics Engineers Inc., 2019) Karatay, Anıl; Yaman, Fatih
    Effects of surface roughness and transversal cell misalignments on the performance of elliptical accelerator cavities are studied in this article. A high-beta, 9-cell elliptical cavity, whose pi-mode resonates at 3.9 GHz, is designed to investigate imperfections. The considered frequency is chosen to observe variations of fundamental accelerating cavity parameters, wake potentials, and wake impedances more clearly by using relatively small structures. Moreover, 3-cell elliptical cavities having pi-mode at 2 and 3.9 GHz are designed to confirm the 9-cell cavity results. The undesired effects caused by the considered mechanical imperfections are simulated for an ultra-relativistic bunch in the parameter scope of a realistic scenario. In particular, Huray's snowball model, which is a scattering-based surface roughness approach developed for microstrip lines, is employed to determine the effects of the surface roughness on the accelerator cavities. Surface roughness due to the fabrication process is expressed as a surface impedance, and the required equivalence between the surface roughness and surface impedance concept is achieved. Significant computational efficiency is observed by using the surface impedance concept with Huray's snowball model in the simulations. Experimental verification of certain parameters is included for an elliptical cavity having high cell-to-cell coupling at 3.9 GHz.
  • Article
    Enhancing Thickness Determination of Nanoscale Dielectric Films in Phase Diffraction-Based Optical Characterization Systems With Radial Basis Function Neural Networks
    (IOP Publishing, 2023) Ataç, Enes; Karatay, Anıl; Dinleyici, Mehmet Salih
    Accurate determination of the optical properties of ultra-thin dielectric films is an essential and challenging task in optical fiber sensor systems. However, nanoscale thickness identification of these films may be laborious due to insufficient and protracted classical curve matching algorithms. Therefore, this experimental study presents an application of a radial basis function neural network in phase diffraction-based optical characterization systems to determine the thickness of nanoscale polymer films. The non-stationary measurement data with environmental and detector noise were subjected to a detailed analysis. The outcomes of this investigation are benchmarked against the linear discriminant analysis method and further verified by means of scanning electron microscopy. The results show that the neural network has reached a remarkable accuracy of 98% and 82.5%, respectively, in tests with simulation and experimental data. In this way, rapid and precise thickness estimation may be realized within the tolerance range of 25 nm, offering a significant improvement over conventional measurement techniques.
  • Article
    Citation - WoS: 3
    Citation - Scopus: 4
    Cost-Effective Experiments With Additively Manufactured Waveguide and Cavities in the S-Band
    (Iop Publishing Ltd, 2023) Karatay, Anıl; Yilmaz, Hasan Önder; Özkal, Ceren; Yaman, Fatih
    This study demonstrates the applicability of additively manufactured components that are metalized with conductive tape for two different microwave experiments. We focus on dielectric measurements and prototyping elliptical accelerator cavities at a low power regime for 2.45 GHz. To illustrate the accuracy of our results for the commonly used solid/liquid materials in engineering and to compare the fundamental accelerator cavity parameters with previous research rectangular and elliptic 3D-printed cavities coated with aluminum-type tape were employed in the experiments. Results reported for the complex-valued permittivities and specific design parameters for the cavity prototype are consistent with the literature. Various approaches to obtain the conductivity value of the tape and the effect of the roughness/thickness of the coating on the reflection parameter are discussed in detail. We confirm the effectiveness of the proposed approach, which reduces costs and provides a high degree of accuracy for investigated applications.
  • Conference Object
    Citation - WoS: 1
    An Origami-Inspired Low-Cost Waveguide Design, Fabrication and Measurements for X-Band Satellite Communication Systems
    (IEEE, 2023) Karatay, Anıl; Ataç, Enes; Yaman, Fatih
    In many applications such as satellite communication, transmission lines are required and waveguides are widely used in these applications. This passive component, which is an indispensable element of microwave systems, is generally not suitable for practical and low-cost applications due to being produced from costly and heavy metals. Therefore, nowadays, the tendency to use low-cost, light and practical components has increased. In this study, origami-inspired waveguide design for X-band satellite communication systems is aimed. This component, which is formed by folding a paper into a three-dimensional structure and covering it with a conductive material, is both practical and fast to produce, portable and adjustable. The obtained simulation results match well with the experimental results, and it has been proven that the paper-based waveguide performs as well as the conventional aluminum waveguide. This makes the proposed method an innovative and cost-effective solution for waveguide fabrication.
  • Doctoral Thesis
    Fluidically Reconfigurable Microwave Systems With Conductive and Dielectric Liquid Materials
    (01. Izmir Institute of Technology, 2024) Karatay, Anıl; Altınkaya, Mustafa Aziz; Yaman, Fatih
    Bu tezde, geleneksel elektriksel ve optik yeniden yapılandırma yöntemlerinin sınırlamalarının üstesinden gelmek amacıyla sıvı destekli mikrodalga bileşenlerinin kullanılmasına ilişkin detaylı bir araştırma sunulmuştur. Öncelikle, minyatürleştirmeye ve düşük hesaplama yüküne öncelik veren, 6.6 GHz ve 7 GHz'de çalışan yeni bir çift bağlantı noktalı anten önerilmiştir. Bu antenin en önemli özelliği, bağlantı noktalarının sıvı metal yoluyla bağımsız frekans yeniden yapılandırma kapasitesine sahip olmasıdır. Ardından, çalışma frekansları 2,45 GHz ve 5,8 GHz olarak tasarlanmış Vivaldi antenlerini kullanan sıvı metal kontrollü çift bantlı bir Doppler radar sistemi geliştirilmiştir. Önerilen radar sistemi aynı zamanda sıvı-metal yer değiştirmesi ile kontrol edilen bir güç bölücüyle de entegre edilerek belirli bantlar arasında kesintisiz frekans geçişine olanak tanımaktadır. Bu yöntem sayesinde literatüre tamamen sıvı yer değiştirmesi ile kontrol edilebilen bir radar kazandırılmıştır. Tezin bir sonraki amacı, sıvı metal kontrollü radarı, daha ucuz ve kolay erişilebilir bir malzeme olan su kontrollü bir forma dönüştürmektir. Bunun için geçirgenlik ölçümlerine başvurulmuş ve karışım bazlı yeni bir yöntem önerilmiştir. Önerilen algoritma, bilinmeyen malzeme geçirgenliğinin belirlenmesini hızlandırmakta ve 3 boyutlu elektromanyetik çözücülere olan hesaplama bağımlılığını azaltmaktadır. Bu amaca ulaşmak için kavite bazlı ayrık modlu çift bantlı geçirgenlik ölçüm sistemi kurulmuş ve geleneksel kavitelerdeki mod ayırma sınırları Lagrange çarpanları kullanılarak belirlenmiştir. Daha sonra bu sınırları aşabilecek yeni kavite tipleri önerilerek geçirgenlik ölçüm düzeneğinin kurulması daha kolay hale getirilmiştir. Ayrık modlu kaviteler, bilinen karışımları referans alarak bilinmeyen malzemenin geçirgenliğini bulmayı amaçlayan yinelemeli ölçüm yöntemiyle birleştirilerek su bazlı malzemenin geçirgenliği ve hacimsel fraksiyonu belirlenebilmiş ve Vivaldi anten tasarımları su ile kontrol edilebilecek şekilde güncellenmiştir. Bu değişiklik, sıvı metal bazlı radarın daha kolay bulunabilen ve uygun maliyetli bir malzeme olan suyla kontrol edilmesini sağlamıştır.
  • Article
    Citation - WoS: 7
    Citation - Scopus: 8
    Implementation and Experimental Verifications of Microstrip Antennas for Angular Scanning of a Doppler Radar
    (Elsevier, 2019) Karatay, Anıl; Orcan, Durmuş; Özkal, Ceren; Yaman, Fatih
    The aim of this study is to improve operational capabilities and range of the MIT-Coffee Can Doppler radar via aperture coupled Vivaldi type transmitter antenna, patch array receiver antenna, and an unequal power divider. Accordingly, a mechanical angular scanning feature for tracking multi-targets and the system integration of lightweight microstrip structures are realized for the radar. A narrow beamwidth in the receiver and a well impedance matching on the overall system to reduce return losses are achieved for the considered application. Good agreements between simulations and measurements for the fabricated antennas/divider and a successful integration of the antennas to the existing system for finding a moving target angular location is reported. It is shown that through wall identification and target velocity at scanned regions can be obtained with the proposed hardware configuration. Simulation results of antenna parameters for various number of array elements are listed which could be a useful tool for different engineering applications. (C) 2019 Elsevier GmbH. All rights reserved.
  • Article
    Citation - WoS: 2
    Citation - Scopus: 2
    Electromagnetic Effects of Equatorially Misaligned Rf Cavities
    (IOP Publishing, 2021) Karatay, Anıl; Yaman, Fatih
    One of the most challenging problems in modern particle accelerator systems is the manufacture of RF cavities within the desired tolerance limits. In this study experimental and computational investigations to quantify the effects of transversal half-cell misalignments on the fundamental accelerator cavity parameters and beam dynamics are presented. Equivalent circuit components of an equatorially misaligned single-cell aluminum elliptical cavity are obtained from the measured data and are employed to calculate longitudinal impedance and modal wake function. Critical coupling and bead-pull measurements are performed at the TM010-like mode frequency, 2.45 GHz for the quality factor and shunt impedance of the high-beta cavity. We report equivalent circuit analysis for higher-order modes and variations of the equivalent circuit components with respect to considered misalignment errors for the MICE experiment's muon cooling cavity. It is shown that using the equivalent circuit model decreases the computational load significantly for the wake field simulations of resonator cavities. Good agreement between simulations and measurements in terms of accelerating cavity parameters and impedances is illustrated.
  • Article
    Thermally Reconfigurable Quad-Port MIMO Antenna With Independent Frequency Tuning
    (Elsevier GmbH, 2025) Karatay, Anil; Atac, Enes
    In this paper, the design, simulations, and measurements of a thermally reconfigurable, compact, high-isolation, microstrip multiple-input multiple-output (MIMO) antenna are presented. We propose a quad-port microstrip antenna sharing the same metallic circular patch. The fully microstrip-based structure provides cost and fabrication advantages over the contemporary counterparts in the literature, and the ability to independently tune the frequencies of the ports allows the assignment of desired frequency bands to each port. The proposed antenna achieves frequency reconfigurability by solely adjusting the angles of the thermally-controlled shape-memory alloy-assisted structures offering more practical and cost-effective tuning compared to the conventional methods. It is well-suited for modern communication applications, as each port covers a unique spatial angle and has sufficient cross-polarization suppression.
  • Article
    Citation - WoS: 4
    Citation - Scopus: 4
    A Symmetrical Self-Diplexing Microstrip Antenna With Eight-Shaped Defects
    (Taylor & Francis, 2022) Karatay, Anıl
    This article aims to demonstrate the simulation and measurement results of a two-port and symmetrical microstrip antenna operating at 6.6 and 7 GHz frequencies. The essential advantages of the antenna in terms of numerical electromagnetism are that the geometry has a small electrical length at both frequencies, does not use a structure that requires extra computational load such as substrate integrated waveguide, and is symmetrical, thus reducing the mesh requirement by half. The proposed antenna was manufactured with the chemical etching method and the measurement results were presented. In addition, varying operating frequencies are shown with the aid of liquid metal to experimentally demonstrate the independent redesign/reconfigurability feature of the antenna. To further reduce the fabrication cost, the manufacturing process of the proposed antenna with the help of a 3D printer is explained, and the performance parameters are compared. Good agreement between simulations and measurements has been reported.
  • Conference Object
    Citation - Scopus: 2
    Compact Proton Accelerator in Uhf Band at Kahvelab
    (JACoW Publishing, 2022) Esen, S.; Adıgüzel, A.; Koçer, O.; Çağlar, A.; Çelebi, E.; Öz, S.; Özcan, V.E.; Karatay, Anıl; Yaman, Fatih; Yılmaz, Hasan Önder
    Proton Test Beam at KAHVELab (Kandilli Detector, Accelerator and Instrumentation Laboratory) project aims to design and produce a radio frequency quadrupole (RFQ) operating at 800 MHz in Istanbul, Turkey using the local resources. The beamline consists of a proton source, a low energy beam transport (LEBT) line including the beam diagnostic section and the RFQ cavity itself. This RFQ is 4-vane, 1-meter-long cavity to accelerate the 20 keV beam extracted from plasma ion source to 2 MeV. Its engineering prototype is already produced and subjected to mechanical, low power RF and vacuum tests. In this study, the results of the first test production, especially the bead-pull test setup will be discussed. © 2022 Proceedings - Linear Accelerator Conference, LINAC. All rights reserved.