Profile URL: https://hdl.handle.net/20.500.13091/11865
Job Title:Dr. Öğr. Üyesi
Email Address:duzer@ktun.edu.tr
Main Affiliation:02.04. Department of Electrical and Electronics Engineering
Status: Current Staff
ORCID:
0000-0003-3850-3810
0000-0003-3850-3810Scopus ID:
49862233600
49862233600YÖK Akademik: DE49B78EE5A44660
Google Scholar:
jX1LTi4AAAAJ
jX1LTi4AAAAJWeb of Science ID:
ABF-6910-2021
ABF-6910-2021Name Variants:
Uzer, D. Uzer, Dilek
22 results
Scholarly Output Search Results
Now showing 1 - 10 of 22
Conference Object Citation - WoS: 1Citation - Scopus: 1Three-Dimensional Printed Helical Antenna Compatible With Rotary Wing Unmanned Aerial Vehicles(Institute of Electrical and Electronics Engineers, 2022-12-14) Uzer, Dilek; Cubuk, SumeyyeIn this study, a basic helical antenna compatible with Unmanned Aerial Vehicles aimed for 5.8GHz band is designed and manufactured by using a three-dimensional printer from Biopolymer Polylactic Acid material. After that, antennas are covered with self-adhesive aluminum tape, copper tape, and Carbon-based conductive spray paint, separately and become conductive. A copper plate reflector is common for all three prototypes. Manufacturing an antenna by this method is easily accessible, fast, and cheap. A Biopolymer Polylactic Acid-based antenna is lighter than a traditional copper wire one. And it provides flexibility in antenna dimensions compared to traditional wire ones. It is seen from simulations and measurements, that the copper tape-covered antenna has the best return loss values. But all three prototypes can be used on Unmanned Aerial Vehicles.Master Thesis Yüksek Kazançlı Mikroşerit Anten Tasarımında Farklı Üretim Tekniklerinin Uygulanması(Konya Teknik Üniversitesi, 2022) Çınar, Ayşe Özge; Uzer, DilekMikroşerit yama antenler; sahip oldukları geometri, hafiflik, üretim maliyetinin daha düşük olması, daha kolay uygulanabilirliği nedenleriyle, en popüler anten tiplerindendir. Mikroşerit yama antenleri, anten yapıları içinde önemli bir gelişme ve yenilik sağlamıştır. Mikroşerit yama antenler düşük bir profil ve ağırlığa sahiptir. Küçük olmaları ve devre elemanlarıyla aynı dielektrik katmanı paylaşabilmelerinden dolayı kolayca entegre devre yapılara uyum sağlayabilir ve taşınabilir cihazların boyutlarını büyütmezler. Fakat rezonans frekansı, bant genişliği, geri dönüş kaybı, kazanç ve verim gibi elektriksel parametreleri güncel haberleşme uygulamaları için yetersiz kalabilmektedir. Bu parametrelerin içinde anten kazancı, antenin her yöne eşit olarak yayılan izotropik bir antenle karşılaştırıldığında, ilettiği gücü vermektedir. Örneğin yüksek menzil gerektiren uygulamalarda haberleşme elemanı olarak daima yüksek kazançlı bir antene ihtiyaç vardır bu yüzden kazancın yüksek olması oldukça önem arz etmektedir. Uygun fiziksel koşul ve yapılarda istenilen anten performansını elde edebilmek için günümüzde farklı tasarımlar üzerinde çalışmalar yapılmakta ve performansı yüksek bir anten için optimizasyon teknikleri kullanılmaktadır. Anten kazancını arttırmak için literatürde pek çok yöntem yer almaktadır. Bunlar; alt taban üzerine dielektrik üsttaş eklenmesi, yama altında hava boşluğu kullanılması, yüksek kalite ve maliyetli dielektrik malzemelerin kullanılması, yama üzerine yarıklar açılması gibi yöntemlerdir. Bu tezde kazanç arttırma yöntemi olarak birden fazla antenin geometrik olarak yerleştirilmesiyle oluşturulan dizi anten tasarımı, modifiye edilmiş toprak düzlemi, yama üzerine dielektrik üsttaş eklenmesi ve yama üzerine yarık açılması gibi farklı teknikler kullanılmıştır. Antenlerde kullanılan üretim tekniği antenin verimliliği için oldukça önemli bir etkendir. Birden fazla anten üretim tekniği vardır ve teknolojinin ilerlemesiyle bunlara yenileri de eklenmektedir. Aynı fiziksel yapıya sahip bir anten için bile bu teknikler değiştikçe anten verileri değişebilmektedir. Bu sebeplerden dolayı bu tezde aynı antenin birden fazla teknik kullanılarak üretimi yapılmıştır. Bu teknikler; ütü ile baskı devre yöntemi, yapışkan PVC folyo ile kaplama yöntemi, yapışkan PVC folyo ile maskeleme yöntemi, PCB cihazı kullanılarak anten üretimi yöntemi ve bakır bant ile kaplama yöntemi olmuştur. Sonrasında üretilen antenler ölçülüp sonuçlar değerlendirilerek farklı tekniklerin etkileri incelenmiştir.Article Citation - WoS: 2Citation - Scopus: 2An Approach To Determine Pathological Breast Tissue Samples With Free-Space Measurement Method at 24 Ghz(WILEY, 2024) Toprak, Rabia; Gultekin, Seyfettin Sinan; Kayabasi, Ahmet; Çelik, Zeliha Esin; Tekin, Fatma Hicret; Uzer, DilekPathology is an important branch of science in the diagnosis and treatment of several diseases. In cancer diseases, serious investigations have been made about the course of the diseases. A report that is essential for both the patient and the doctor is prepared by the pathologists as a result of a detailed cellular examination. These reports contain information about the disease. Access duration to these reports, which affects the form and duration of the treatment, is extremely important today. It is possible to shorten this period with systems using antenna technologies. The pathological breast tissue samples have been examined by using horn antenna structures with high gain in this study. Dual identical horn antennas have been placed opposite each other as receivers and transmitters in the measurement setup at 24 GHz. Measurements of normal and cancerous breast tissues have been made, and the normalization process has been applied to the measured scattering parameters. The different values between normal and cancerous breast tissues have been shown with this process. The normalized values are compared with other analyzed values. According to the results obtained, the percentage of normalized values for transmission is much more effective and meaningful than other results.Article A Novel Design of a Compact Wideband Patch Antenna for Sub-6 Ghz Fifth-Generation Mobile Systems(2020-08-15) Yerlikaya, Mehmet; Gültekin, Seyfettin Sinan; Uzer, DilekIn this paper, a new broadband patch antenna design for fifth-generation (5G) sub-6 GHz mobile systems is presented. The proposed 5G antenna has a very compact size with an overall dimension of 10.7 × 22.5 mm2. The 5G antenna consists of a log-periodic patch in the form of an equilateral triangle with a 50 ? microstrip line feed and a ground plane of rectangular shape. The prototype of the proposed 5G antenna was made by etching on an FR4 substrate with a 1.6mm thickness, 4.3 dielectric constant and 0.02 tangent loss. The 5G antenna is designed and simulated for the frequency band range of 3.4-4.2 GHz. According to the measurement results, the 5G antenna impedance band range is determined as 3.1-3.9 GHz. Besides, the proposed 5G antenna has also near-omnidirectional radiation patterns both simulation and measurement at the resonance frequencies of 3.8 GHz and 3.5 GHz, respectively. According to these results, the proposed antenna is showed similar radiation characteristics in both measured and simulated results. With all these radiation and physical properties, the proposed log-periodic patch antenna is very suitable for sub-6 GHz 5G mobile applications.Article Investigation of Gain Enhancement in Microstrip Antenna Structure in Pathological Tissue Samples(2021) Uzer, Dilek; Gültekın, Seyfettin Sinan; Toprak, RabiaPathological reports play an important role in the diagnosis and especially in the treatment of diseases. For this reason, it is important to be able to access the reports of pathological tissue samples in a short time. Today, depending on the pathologist and the number of samples, the report delivery time can take months. For this reason, microstrip antenna structures, which are frequently used in the biomedical field, are investigated to evaluate pathological tissue samples. In this study, the variation of the gain values of antenna structures depending on the simulation results is examined. FR-4 substrate material, which has a dielectric constant of 4.4, is used in the microstrip antenna structure. The diameters of four circles added to the antenna patch structure with an operating frequency of 2.45 GHz are changed parametrically. The highest gain value of the antenna structure is investigated. The gain value has been increased from 1.89 dB to about 3.5 dB.Conference Object Comparison of Far Field and Near Field Values of Skin Tissue Measured Using Microstrip Antenna Structure(Institute of Electrical and Electronics Engineers Inc., 2022-05-15) Toprak, Rabia; Gültekin, Seyfettin Sinan; Uzer, DilekPathology science has an important place in the medical field. Its importance is increasing day by day because it evaluates the information about diseases at the cellular level. The reports prepared from the tissue samples examined by the pathologists contain very important information for both the patient and the doctor. This information may include the level of the disease and the mode of treatment. Therefore, the time to reach the pathological reports is important. Microstrip patch antennas are used for various purposes in the biomedical field. In this study, the far and near field outputs of the evaluations of the pathological tissue samples were tested with the microstrip patch antenna structure. For this, a microstrip patch antenna with an operating frequency of 2.45 GHz was used. Pathological tissue samples were modeled in the free-space measurement technique created using the antenna structure. The electric field and scattering parameter values obtained as a result of the simulations using the Ansys HFSS program were evaluated for the near and far field. When the evaluation results are examined, it has been shown that near field measurements for electric field data and far field measurements for scattering parameter data are more efficient. © 2022 IEEE.Article Citation - WoS: 3Citation - Scopus: 5A Low Profile Wideband Log Periodic Microstrip Antenna Design for C-Band Applications(LGEP-SUPELEC, 2019-03-17) Yerlikaya, Mehmet; Gültekin, Seyfettin Sinan; Uzer, DilekIn this study, a wideband and low profile microstrip log periodic monopole antenna (LPMA) design for C-band applications is presented. The proposed antenna consists of a monopole log periodic patch in the equilateral triangular dimensions with the microstrip line fed and a rectangular ground plane. The antenna has 9x19.8 mm(2) overall size, thickness of 1.6 mm, 4.3 dielectric constant, and 0.02 tangent loss. According to the simulation results, the proposed antenna has a 60% bandwidth while operating in the frequency band of 4.25-7.95 GHz and 5 GHz resonance frequency. The proposed antenna was also prototyped on FR4 substrate and the results obtained from the measurements were quite similar to the simulations.Publication Circular Microstrip Antenna Array at 5.8GHz Frequency for Unmanned Aerial Vehicles(2021) Cınar, Alparslan; Uzer, Dilek; Gültekın, Seyfettin SinanIn the study, an antenna array is designed that has two circular patch elements. Elliptic slots are etched on circular patches than a rectangular piece is added in the center of the slots. The array has a directional radiation pattern with a gain of 11.95 dB. It is resonated at 5.8 GHz ISM band with a return loss value of over -10dB. It is fed by a microstrip line matched to 50 Ω. The array is simulated by ANSYS Electromagnetics Suite, HFSS and parametric optimizations are completed. After determining the optimum parameters, it is manufactured on FR-4 substrate that a thickness of 1.6 mm and a dielectric constant value of 4.4 and a tangent loss of 0.002 by handmade in our laboratory. FR-4 is chosen because of it’ s easy to find and cheap. It is studied in a Bachelor degree final thesis by Ayse Ozge Cinar and her supervisor Seyfettin Sinan Gultekin, and planned to use in an international competition. The 2x1 array is manufactured by using chemical process method that uses hydrochloric acid and hydrogen peroxide solution with a ratio of 3:1. The measurements of S 11 and impedance are obtained with Rohde Schwarz ZVL-13 Vector Network Analyzer in normal room conditions. The array is designed and manufactured as two, for a usage with Unmanned Aerial Vehicle (UAV) communication system on the both receiver and transmitter modules. So, the main aim is obtaining a high gain value over 10dB, and a resonant frequency of near 5.8 GHz. An applicable dimension of the whole array and being light are other necessities. In addition, a long communication distance about 1.5-2 km is needed. The study is started with designing a single circular patch, using formulas from literature. In the second step, with an inspiration of [3] , an elliptic slot is etched on it. Patch and slot parameters are tried with different values in simulations to aim a higher gain. The third step is adding a rectangular piece in the center of the slot with a parametric sweep. For the optimum parameters, the single antenna is also manufactured and measured. After the performance evaluation of this single patch design, the array is created for two antenna elements. The suitable proximity between antenna elements that blocked interference and impedance matching arrangement of the microstrip feedline are completed in simulation media. From comparison of simulation and measurement results, they are compatible with each other and showed that the array design can be used by successfully on communication of unmanned aerial vehicles.Article Evaluation and Comparison of Electromagnetic and Scattering Parameters Data of Two Microstrip Patch Antennas Operating in Ism Band for Cancer Detection(2020-10-02) Top, Rabia; Gültekin, Seyfettin Sinan; Uzer, Dilek; Toprak, RabiaCancer diseases significantly affect lives of many people for last years. The diagnosis and treatment process is quite difficult and painful. It is especially important to reach the result of pathological tissue samples in which the structure of the cancerous tissue is determined and helps to shape the treatment in a short time. Today, it may take days or even months to obtain these results. In this study, microstrip antenna structures that are frequently used due to many advantages in biomedical applications are studied. Electromagnetic field and scattering parameter data of two antennas operating in the 2.45 GHz and 5.8 GHz operating frequency in ISM (Industrial, Scientific and Medical) band region are analyzed and compared. Pathological sample transformed form of tumor and normal skin tissue is simulated and compared in Ansys' HFSS program. Both the electric field values and the S-parameter values were compared by obtaining the values of both antennas at 2.45 GHz and 5.8 GHz from simulations. When looking at the results obtained, the difference rates in the data obtained from the antenna results radiating in the 2.45 GHz region are higher as a percentage. Thus, it is possible to say that it is more advantageous to use the 2.45 GHz frequency in antenna structures used for this purpose compared to the 5.8 GHz radiation area.Article Citation - WoS: 4Citation - Scopus: 9Microstrip Antenna Design With Circular Patch for Skin Cancer Detection(LGEP-SUPELEC, 2019) Top, Rabia; Ünlü, Yaşar; Gültekin, Seyfettin Sinan; Uzer, DilekDue to the many advantages of microstrip patch antennas, nowadays, microstrip patch antennas are mostly preferred in biomedical areas. This study aims two antenna structures, as both transceiver and receiver, have same dimensions are designed to produce solution of the difficulties in pathology. For antennas with an operating frequency of 2.45 GHz, FR-4 substrate material with a value of 4.4 dielectrics is used. A model has been prepared to detect the presence of skin cancer with the designed antennas. The model is a method of determining E-field and scattering parameters differences between two antennas of cancerous and normal tissue specimens placed on the glass slides. The same antennas and experimental setup were prepared with the normal and cancerous structure of the skin tissue prepared by pathologists. Thus, scattering parameters are measured, and their differences are determined. It has been shown that cancerous tissue can be determined with different values obtained as a result. Ansys HFSS program is used for designs and simulations.
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Research Topics
Domains
Physical Sciences
Fields
Engineering
Subfields
Aerospace EngineeringBiomedical EngineeringElectrical and Electronic Engineering
Specific Research Areas
Antenna Design and Analysis
Wireless Body Area Networks
Microwave Engineering and Waveguides
Advanced Antenna and Metasurface Technologies
Antenna Design and Optimization
Sustainable Development Goals
3GOOD HEALTH AND WELL-BEING
4
Research Products
7AFFORDABLE AND CLEAN ENERGY
3
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
Research Products
Documents
16
Citations
35
h-index
4
Documents
16
Citations
61
Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Konya Technical University | 16 |
| Karamanoğlu Mehmetbey University | 11 |
| Selçuk University | 6 |
| Necmettin Erbakan University | 2 |
| Konya Eğitim ve Araştırma Hastanesi | 1 |
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Data obtained from OpenAlex
| Journal | Count |
|---|---|
| Avrupa Bilim ve Teknoloji Dergisi | 4 |
| 2022 Conference on Antenna Measurements and Applications -- DEC 14-17, 2022 -- Guangzhou, PEOPLES R CHINA | 2 |
| ADVANCED ELECTROMAGNETICS | 2 |
| 2025 IEEE Conference on Antenna Measurements and Applications (CAMA) | 1 |
| 4th International Symposium on Multidisciplinary Studies and Innovative Technologies, ISMSIT 2020 - Proceedings | 1 |
Current Page: 1 / 3
Scholarly Output
22
Articles
10
Views / Downloads
48/195
Supervised MSc Theses
4
Supervised PhD Theses
0
WoS Citation Count
10
Scopus Citation Count
17
Patents
0
Projects
0
WoS Citations per Publication
0.45
Scopus Citations per Publication
0.77
Open Access Source
14
Supervised Theses
4
Scopus Quartile Distribution
Competency Cloud
