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Yayın Design and implementation of wideband microwave amplifiers based on Normalized Gain Function(Institute of Electrical and Electronics Engineers Inc., 2014) Köprü, Ramazan; Kılınç, Sedat; Aksen, Ahmet; Yarman, Bekir Sıddık BinboğaIn this work, we introduce the design and implementation of wideband microwave amplifiers based on "Normalized Gain Function (NGF)" method. Normalized Gain Function is defined as the ratio of desired shape or frequency response of the gain function of the amplifier to be designed and shape of the transistor forward gain function. Synthesis of input/output matching networks (IMN/OMN) of the amplifier require target gain curves as the functions of normalized gain function to be tracked in two sequential nonlinear optimization processes. A prototype low power amplifier circuit is produced and measured to show the usability of the design approach.Yayın Mixed element wideband microwave amplifier design via simplified real frequency technique(IEEE Computer Society, 2014) Kılınç, Sedat; Köprü, Ramazan; Aksen, Ahmet; Yarman, Bekir Sıddık BinboğaIn this study, we illustrate the design and implementation of a wideband microwave small-signal amplifier composed of mixed elements. The design is based on Simplified Real Frequency Technique (SRFT). A design of low power amplifier circuit is completed and its simulations are performed in success. The circuit is designed with lumped elements, however, some of the lumped elements are converted to distributed elements for their convenience in production. In this way, a mixed element wideband microwave amplifier comprised of input/output matching networks with lumped and distributed elements has been formed. Layout work and also post layout simulation is given with satisfying results.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 Unit element bandpass filter design via simplified real frequency technique for UWB microstrip patch antenna(IEEE Computer Society, 2014) Köprü, Ramazan; Kılınç, Sedat; Aksen, Ahmet; Yarman, Bekir Sıddık BinboğaDesign of a UWB (Ultra Wideband) microstrip patch antenna to operate in the first channel of the UWB standard and a bandpass (BP) UE (Unit Element) microstrip filter (BPUEF) for this antenna are studied and presented with promising experimental results. A typical UE BP filter is a lossless 2-port network which is formed with certain number of cascade connected commensurate transmission lines. Based on the simplified real frequency technique (SRFT) in Richards domain, driving point Darlington impedance function of the BPUEF is obtained via optimization such that optimum power transfer would be possible between a PA (power amplifier) and the antenna. Using the UE synthesis, characteristic impedance values of each UE is extracted from the input impedance function. Theoretical design (Matlab), simulation (ADS, Agilent Inc.) and the measurements are shown to be in a high degree of agreement.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 Design and realization of wideband matching networks in Richards domain(Institute of Electrical and Electronics Engineers Inc, 2014) Kılınç, Sedat; Köprü, Ramazan; Yarman, Bekir Sıddık BinboğaA broadband matching network design is given with its simulation and prototype measurement results. The circuit contains certain number of cascaded unit-elements (UEs) and open-stubs which behave as Richards capacitors. Richards domain driving point immittance (impedance or admittance) function of the network is obtained utilizing the Real Frequency Direct Computational Technique (RFDCT). Synthesis of the immittance function via "high precision Richards synthesis package" yields the characteristic impedances of microstrip unit-elements, open and short stubs. Kuroda transforms are used to convert short-stubs to open-stubs due to their difficulties in manufacturing. Theoretical design, simulation and measurements are in a good agreement.
