Aydın, Elif

Aydın, Elif

Name Variants

A., Elif
E.,Aydın
E.,Aydin
Aydin,E.
E., Aydin
Aydın, Elif
Elif, Aydin
Aydin, Elif
Aydın,E.
A.,Elif
Elif, Aydın
Aydin, E

Job Title

Profesör Doktor

Email Address

elif.aydin@atilim.edu.tr

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Scholarly Output

67

Articles

30

Citation Count

219

Supervised Theses

13 Scholarly Output Search Results

Now showing 1 - 10 of 67

Wimax uygulaması için çift bantlı tek slotlu mikroşerit yamal' anten
(2014) Aydın, Elif; Aydın, Elif; Yapıcı, Alparslan Çağrı; Department of Electrical & Electronics Engineering
Günümüzde iletişimde, mobil iletişim, uydu navigasyonu, internethizmetleri,otomobiller ve radarlargibi farklı alanlarda antenler birçok uygulamada kullanılmaktadır. özellikle de mikroşerit antenler kullanılmaktadır çünkü bu tür antenler düşük profilli, hafif, ve düşük kuvvetle çalışabilme özelliklerine sahiptirler. Bu tür antenlerin dezavantajlarını ortadan kaldırmak için özel malzemelerin kullanılması ve şeklinde modifikasyona gidilmesi sağlanabilir. Çift polarizasyon ve çift bant uygulaması durumunda, mikro şerit antenler iyi bir itibara sahiptirler. Bu tez, antenin temel olarak Wimax baz istasyonu sinyali için kullanılmasının amaçlandığı Wimax uygulaması IEEE 802.16e-2005 çift bantlı antenlerin sağlamasına yönelik bir tasarımı sunmaktadır. Antenin tasarım parametreleri iletim hattı modeli kullanılarak hesaplanmıştır ve HFSS elektromanyetik yazılım Sonlu Elemanlar Modeline (FEM) dayalı olan simülasyon süreci için kullanılmıştır. Bu çalışmadaçift bant anten yamanın üst kısmına eklenen bir slot ile tasarlanmıştır. Başlangıçta çift beslemeli bir anten fikrine çok fazla ilgili duyulsa da eşleştirme sorunu bu antenin simülasyonunun yapılmasını ve antenin gerçekleştirilmesini zorlaştırmaktadır. Özet olarak söz konusu anten simüle edilmiş ve üretilmiştir.
Citation Count: 9
Modified resonant frequency computation for tunable equilateral triangular microstrip patch
(Ieice-inst Electronics information Communications Eng, 2010) Aydın, Elif; Can, Sultan; Department of Electrical & Electronics Engineering
In this paper, a new closed form expression is developed to accurately estimate the resonant frequency of an equilateral triangular patch. The proposed computation is also extended to the two-layer structure in order to define the air-gap tuning effect on the resonant frequency. The theory established in this paper is compared with the experimental and theoretical results available in the literature. The results of this study show a considerable improvement achieved over the previous theories within very small percentage errors for almost all cases.
RFID kullanarak yer bulma algoritması
(2011) Özyurt, Erdem; Aydın, Elif; Aydın, Elif; Yapıcı, A. Çağrı; Department of Electrical & Electronics Engineering
Bu tez çalışmasında gezgin robota RFID etiket yerleştirilmiş ve okuyucu antenleri ise iç mekan etrafına dizilmiştir. Gezgin robotun pasif UHF RFID etiket taşıyor olması ağırlık yönünden avantaj sağladığı gibi batarya ömrü açısından da verimi artırmaktadır. Ayrıca, hareketli cismin sayısının artırılması durumunda donanım bakımından sadece düşük maliyetli pasif RFID etiket sayısının artırılması yeterli olacaktır. Geliştirilen tekniklerde elektromanyetik teori yanı sıra sinyal işleme teknikleri de kullanılmıştır. Anten dizisi kullanımıyla genlik karşılaştırma sağlanmıştır.Bu çalışmada sistemin uygulanabilirliğini gösterecek prototip tasarlanmış ve pilot uygulama yapılmıştır.
A REMOTE LABORATORY FOR TRAINING IN RADIO COMMUNICATIONS: ERRL
(IEEE, 2007) Kara, Ali; Aydın, Elif; Çağıltay, Nergiz; Çağıltay, Nergiz; Department of Electrical & Electronics Engineering; Software Engineering
This paper presents, first, a short survey of remote laboratory initiatives in electrical and computer engineering, and then discusses design and development phases of remote laboratory environment on radio communications, the ERRL (European Remote Radio Laboratory). As being the first attempt in establishing of such a large scale remote laboratory on radio communications, ERRL enables access to high technology RF equipments and setups through the Internet. The software structure, target groups and experimental set ups of ERRL are shortly discussed. First attempts on implementation of pilot experiments are discussed.
Citation Count: 29
Requirements for Remote RF Laboratory Applications: An Educators' Perspective
(Ieee-inst Electrical Electronics Engineers inc, 2009) Aydın, Elif; Kara, Ali; Oktem, Rusen; Çağıltay, Nergiz; Alexandru, Marian; Reiner, Bodo; Department of Electrical & Electronics Engineering; Software Engineering
This paper discusses the results of a study of the requirements for developing a remote RF laboratory. This study draws on the perspectives of educators in university electrical engineering departments and in technical colleges, on the teaching of the radio frequency (RF) domain. The study investigates how these educators would like the technical content of a state of the art RF laboratory to be designed. As far as the authors know, no publication exists in the literature that investigates the requirements and needs of remote laboratories in that particular field. The outcomes of this work are expected to guide remote laboratory platform developers towards the most effective design of their platforms, The analysis of the results showed that educators would like the technical content of the laboratory to cover basic communication techniques, microwave circuits and devices, antennas and propagation, RF technology, and radio system design aspects of modern telecommunication systems. They would therefore like the laboratory instrumentation to be designed to that end. The educators also reported the need for advanced experimental setups which require expensive RF measurement devices. The discrepancy between university and technical college views was also considered in this paper.
Citation Count: 5
Principles for the design of a remote laboratory: A case study on ERRL
(2010) Aydın, Elif; Kara, Ali; Kara,A.; Department of Electrical & Electronics Engineering
Remote laboratories are getting very popular in engineering education programs. However, there are not many studies addressing the requirements and design issues of such laboratories. This paper discusses the results of a study of the requirements for developing a remote Radio Frequency (RF) laboratory for university students. This study draws on the perspectives of the students at the university, department of electrical engineering. The results are based on a research study established by 111 engineering students from France, Germany, Romania and Turkey. It investigates how students would like to use the technical content of a state of the art RF laboratory. The result of this study is also compared with the previous outcomes showing perspectives of the other learner groups of such laboratories; engineers and technicians in the technical colleges on the Radio Frequency (RF) domain. Considering the outcomes developed so far, some principles that need to be considered while designing and developing such a laboratory have been proposed. As a case study the proposed principles are implemented in a remote laboratory project. In this paper, the details of user requirements of such laboratories, the proposed principles and the implementation examples are all provided and discussed. Primarily, the general aim of this study is to guide remote laboratory platform developers towards the most effective design of their platforms. © 2010 IEEE.
Citation Count: 1
Low Radar Cross Section UAV Design in X-Band;
(Institute of Electrical and Electronics Engineers Inc., 2022) Aydın, Elif; Sezgin,S.; Gökdoğan, Bengisu Yalçınkaya; Gokdogan,B.Y.; Aydin,E.; Department of Electrical & Electronics Engineering; Electrical-Electronics Engineering
As Unmanned Aerial Vehicles (UAVs) have become widespread in defense industry, the radar technology that can detect them has also improved. These improvements cause UAVs to be detected more easily, which limits their effectiveness in military usage. Although the reduction of the radar cross-section (RCS) can provide a solution to this issue, the studies regarding that is insufficient in the literature. In this study, a shaping method is recommended to reduce the RCS of UAVs, and it is shown the method is effective to address the problem. Firstly, using a simulation tool, an UAV model is designed from simple shapes and the model is validated by comparing it with the ones in literature. Secondly, RCS values are measured using vertical and horizontal polarization throughout 360 degrees by incrementing the aspect angle by one degree in X-Band using the CST Studio Suite environment. Then, considering the hardware and aerodynamic requirements as well as limitations of the UAV model, a shaping technique is applied to the body, legs and the hollow parts of the UAV model with parametric simulations. The results show that the recommended shaping technique can provide a significant reduction in the RCS of an UAV. © 2022 IEEE.
Principles for the Design of a Remote Laboratory: A Case Study on ERRL
(IEEE, 2010) Çağıltay, Nergiz; Aydın, Elif; Kara, Ali; Department of Electrical & Electronics Engineering; Software Engineering
Remote laboratories are getting very popular in engineering education programs. However, there are not many studies addressing the requirements and design issues of such laboratories. This paper discusses the results of a study of the requirements for developing a remote Radio Frequency (RF) laboratory for university students. This study draws on the perspectives of the students at the university, department of electrical engineering. The results are based on a research study established by 111 engineering students from France, Germany, Romania and Turkey. It investigates how students would like to use the technical content of a state of the art RF laboratory. The result of this study is also compared with the previous outcomes showing perspectives of the other learner groups of such laboratories; engineers and technicians in the technical colleges on the Radio Frequency (RF) domain. Considering the outcomes developed so far, some principles that need to be considered while designing and developing such a laboratory have been proposed. As a case study the proposed principles are implemented in a remote laboratory project. In this paper, the details of user requirements of such laboratories, the proposed principles and the implementation examples are all provided and discussed. Primarily, the general aim of this study is to guide remote laboratory platform developers towards the most effective design of their platforms.
Citation Count: 10
An RFID based indoor tracking method for navigating visually impaired people
(Tubitak Scientific & Technological Research Council Turkey, 2010) Aydın, Elif; Aydin, Elif; Department of Electrical & Electronics Engineering
This paper tackles the RFID based tracking problem in an obscured indoor environment. The proposed solution is an integral part of a navigation aid for guiding visually impaired people in a store. It uses RF signal strengths and is based on the Bayes Decision Theory. An observation vector is formed by received radio signal strength indication values, transmitted from three transmitters at distinct frequencies in the UHF band. The indoor area is divided into square grids, where each grid is considered as a class. The problem of tracking is expressed as classifying the observed radio signal strengths to the most likely class. A classification rule is formulated by incorporating a priori assumptions appropriate for the studied model. The proposed approach is tested in a laboratory environment. The results prove that the proposed approach is promising in tracking especially when the tracked person is guided by a system.
Çokbantlı çeşitli yarık anten tasarımı
(2017) Aydın, Elif; Aydın, Elif; Department of Electrical & Electronics Engineering
Bu günlerde, mikro şerit antenler internet hizmetleri, mobil iletişim ve uydu navigasyonu gibi çeşitli alanlarda geniş bir uygulama yelpazesi bulunmaktadır. Mikroşerit anten iki metal tabakadan ve bir alt tabakadan oluşur. İki metal tabakadan üst katman yama, alt katman isetopraktır. Yama ile toprak arasında belli bir dielektrik sabitine ve kalınlığa sahip alt katman tabakası bulunur. Bu çalışmanın amacı, Wi-Fi cihazları ve Kablosuz İletişim Sistemi için çok bantlı antenler tasarlamanın yolunu sunmaktır. Bu frekans bantları, WLAN uygulamaları için standart IEEE 802.11b / g (2.4-2.485GHz) ve IEEE 802.11a (5.15- 5.35GHz) ile 2.5 GHz (2.5-2.69GHz) ve 3.5 GHz (3.3-3.8GHz) ve Wi-MAX uygulamaları için 5 GHz (5.25-5.85GHz)bantlarını kapsamaktadır. Benzetim için HFSS yazılımını kullanarak iki farklı tasarım yaptık. Çok bantlı yuvalı antenler, iki tür besleme kullanılarak benzetimi yapılmış ve üretilmiştir. Öncelikle, anten tasarımında mikro şerit besleme hattını ve ardından eş düzlemli (CPW-Besleme) kullandık. Çok bantlı mikro şerit antenler, geri dönüş kaybı (S11) ve kazanç açısından tasarlandı ve benzetimi yapıldı.Bu tasarımlar imal edildi ve dönüş kayıpları ölçüldü ve benzetim sonuçları ile karşılaştırıldı.

Aydın, Elif

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Scholarly Output

67

Articles

30

Citation Count

219

Supervised Theses

13

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