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Yayın Wideband bandpass filter design for X band horn antenna via numerical techniques(IEEE Computer Society, 2015) Köprü, Ramazan; Aydın, Çağatay; Atilla, Doğu Çağdaş; Kılınç, Sedat; Yarman, Bekir Sıddık BinboğaDesign of an X band horn antenna and a wideband unit element microstrip bandpass filter (UEBPF) for this antenna are presented with satisfactory agreement between theoretical and simulation results. Numerical methods known as real frequency techniques (RFTs) have been utilized in Richards domain to yield optimum driving point Darlington input impedance function belonging to the UEBPF that enables a maximum RF power transmission between the designed horn antenna and an RF driving source. Using a high precision Richards immittance synthesis package in Matlab, characteristic impedance values of each UE, out of k number of commensurate (equal length) transmission lines forming the UEBPF, is extracted from the input impedance function. Theoretical design (Matlab of Mathworks Inc.) and simulation (ADS of Agilent Inc., HFSS of ANSYS Corp.) results are shown to be very promising and in a high degree of agreement with each other.Yayın Transformerless bandpass matching network design for Y-Shaped monopole antenna(IEEE, 2015) Aydın, Çağatay; Atilla, Doğu Çağdaş; Karakuş, Cahit; Köprü, Ramazan; Yarman, Bekir Sıddık BinboğaIn this paper, a transformerless bandpass matching network design procedure is presented. The Real Frequency Techniques are powerful numerical methods to design wideband lossless 2-port networks such that filters and matching networks. In these techniques, the value of the termination resistance of the designed network could not be yielded as 50 ohm by numerical package. Hence, a transformer is also required for 50 ohm termination which is not practical for high frequency applications. Also in this study a novel wideband monopole antenna is presented. The proposed antenna is consisting of two major elements; Y-shaped impedance matching plate and hemi-circular radiator. Moreover Y-shaped impedance matching plate connected to a feeding probe excites the suspended hemi-circular radiator via air gap. and its frequency band is expanded by using transformerless bandpass design procedure.Yayın Design and simulation of miniaturized communication systems employing symmetrical lossless two-ports constructed with two kinds of elements(IEEE, 2003) Yarman, Bekir Sıddık Binboğa; Aksen, Ahmet; Çimen, Ebru GürsuIn this paper, a semi-analytic method is presented to describe symmetrical lossless networks with two-kinds of elements, namely, distributed and lumped elements in cascade connection. in terms of the independently chosen parameters, element values of the lossless symmetrical networks are given by explicit formulas up to nine elements. It is expected that the results presented in this paper will find immediate usage in performance assessment, design and simulation of analog/digital wireless communication systems put on MMICs or VLSI chips.Yayın 0.8-1.9 GHz mikrodalga kuvvetlendirici tasarımı(IEEE, 2016-12-03) Koç, Onur; Kılınç, Sedat; Köprü, Ramazan; Yarman, Bekir Sıddık BinboğaGünümüzde haberleşmede kullanılan iletişim araçlarının tasarımı büyük bir gelişim ve değişim göstermektedir. İletişim araçları birçok sistemden oluşmaktadır. Bu çalışmada iletişimin sağlanmasında büyük öneme sahip olan sistem olarak Mikrodalga kuvvetlendirici tasarımı yapılmıştır. Mikrodalga kuvvetlendirici tasarımı 0.8-1.9 GHz bant genişliğinde hücresel haberleşme için gerçekleştirilmiştir. Kuvvetlendirici devresi ADS (Advanced Design System) programı kullanılarak tasarlanmıştır. Kuvvetlendirici tasarımı ideal devre, mikroşerit devre, serim devre tasarımı ve devre üretimi aşamalarından oluşmaktadır. Bu çalışmada yapılan tasarımların üretim sonuçları program tasarımına benzer çıkmıştır.Yayın Wideband matching network design for a V-Shaped square monopole antenna using Real Frequency Technique(IEEE, 2013) Köprü, Ramazan; Aydın, Çağatay; Atilla, Doğu Çağdaş; Karakuş, Cahit; Yarman, Bekir Sıddık BinboğaIn this paper, design and simulation of a wideband matching network for a broadband V-shaped square monopole antenna is presented. Matching network design is unavoidable in most cases even vital to facilitate a maximally flat power transfer gain for an antenna. In the work, the matching network design is done for a particular square monopole antenna with V-shaped coupling element that has essentially bandwidth increasing effect. The V-shaped antenna had been manufactured, tested and analyzed elaborately in a previous work. With this work, it is now equipped by a matching network. 'Real Frequency Technique' (RFT) is employed in matching network design.Yayın Broadband matching of PA-To-PCB interconnection for X-band wireless power transfer(Institute of Electrical and Electronics Engineers Inc., 2019-08) Köprü, RamazanDesign and simulation of a microwave wideband microstrip unit element bandpass matching network is presented, potential use might be a broadband WPT (microwave wireless power transfer) application in X-band frequencies (8-12 GHz). The source of the main energy can be wind, fossil, tidal, solar, nuclear, hydro etc. and the main energy can be converted from DC to microwave energy which then can be transmitted via the proposed WPT circuit towards a few or a network of a multiple microwave harvester receivers located at a near or far field from the main source. In the work, a bandpass matching network (BPMN) composed of microstrip "unit elements (UEs)" is designed to operate along the whole X-band (8-12 GHz). Designed BPMN is excited by an X-band commercial PA (power amplifier) MMIC (monolithic microwave integrated circuit) packaged chip, and it is loaded by an X-band microstrip patch antenna. A bond wire soldered between the RF output pad of MMIC chip and the input pad of the BPMN has an equivalent LC parasitic impedance assumed to be the generator complex impedance that must be compensated in a typical matching problem. SRFT (simplified real frequency technique) is used in the design of the matching network that compensates the effect of bond wire and very good agreement found between the theoretical design and simulations done in MWO (AWR).Yayın Richards uzayında band geçiren devre fonksiyonu gerçeklemesi ve yama anten uyumlaştırmada kullanımı(IEEE, 2014-04-23) Köprü, Ramazan; Aydın, Çağatay; Yarman, Bekir Sıddık BinboğaLiteratürde çok iyi bilinmektedir ki, Richards-düzlemi, Laplace-düzleminde tanjant hiperbolik eşlemesi uygulanarak elde edilen dönüştürülmüş bir uzaydır. Richards frekansı cinsinden üretilen devre fonksiyonları gerçek frekans ekseninde π periyoduna sahiptir. Richards uzayında alçak geçiren prototip devre fonksiyonu tasarlandığında, bu periyodik özellik nedeniyle, karşı gelen periyodik band geçiren devre fonksiyonu frekans ekseninde belirli bandlarda tekrarlanarak ortaya çıkmaktadır. Tasarımcı, uygulamanın gereksinimlerine göre bu tekrarlanan bandlar arasından ilgilendiği bandı seçebilir. Bu çalışmada, 3.2448-3.744 GHz bandında çalıştırılmak üzere tasarlanmış UWB uygulamaları için elverişli bir mikroşerit yama anten için eş-uzunluklu (commensurate) iletim hatları ile oluşturulmuş uyumlaştırma devresi tasarımı ele alınmaktadır. Tasarımda, SRFT (Simplified Real Frequency Technique: Basitleştirilmiş Gerçel Frekans Tekniği) kullanılmaktadır ve teorik tasarım ile MWO (AWR) benzeşimleri arasında çok iyi uyum olduğu gözlenmiştir.
