Doğu Çağdaş Atilla
Işık University
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Publication
Featured researches published by Doğu Çağdaş Atilla.
conference on microwave techniques comite | 2013
Tayfun Nesimoglu; Cagatay Aydin; Doğu Çağdaş Atilla; Binboga Siddik Yarman
Software Defined Radio (SDR) technology aims employing commercial communication standards within a single transceiver unit. Therefore, the design of broadband frequency tunable microwave components; particularly tunable amplifiers have gained considerable importance in recent years. In this work, a tunable inductor topology is proposed, theoretically analyzed and simulated. By using tunable capacitors, tunable inductors were obtained and broadband tunable matching networks are designed. Eventually a frequency tunable broadband amplifier covering 800-7500 MHz band has been realized.
mediterranean microwave symposium | 2015
Ramazan Kopru; Cagatay Aydin; Doğu Çağdaş Atilla; Sedat Kilinc; Binboga Siddik Yarman
Design 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.
international symposium on circuits and systems | 2013
Doğu Çağdaş Atilla; Cagatay Aydin; Ramazan Kopru; Tayfun Nesimoglu; Binboga Siddik Yarman
Coverage of commercial communication standards such as GSM, UMTS, Wi-Fi and Wi-Max within a single transceiver chip is one of the most desired properties by wireless communication manufacturers. In this regard, communication companies are keenly interested in the design of high power amplifiers for broadband cellular communications to achieve this coverage. In this work, design of broadband tunable matching networks is investigated using Real Frequency Techniques. In practical applications, tunability is needed to compensate for the load impedance variations with environmental effects. In order to be able to work on sample structures, impedance transforming filters with proper topology are chosen and a broadband tunable matching network with a tunability strategy is developed. Eventually a broadband amplifier has been designed using the tunable inductor concept.
mediterranean microwave symposium | 2014
Doğu Çağdaş Atilla; Cagatay Aydin; Tayfun Nesimoglu; Ramazan Kopru; Ahmet Aksen; Binboga Siddik Yarman
In recent days, radio manufacturers are increasingly interested in broadband amplifiers for cellular communication. Demands of customers enforce manufacturers to develop systems compatible for all standards and it is mandatory to accommodate more than one amplifier or tunable amplifier in front end of communication systems. In this paper, design of tunable amplifier is investigated by using Real Frequency Technique and agility of tunable components is provided by digital tunable capacitors.
International Journal of Microwave and Wireless Technologies | 2014
Ramazan Kopru; Sedat Kilinc; Cagatay Aydin; Doğu Çağdaş Atilla; Cahit Karakus; Binboga Siddik Yarman
In this paper, design, manufacture, and measurement of a wideband matching network for a broadband V-shaped square planar monopole antenna (V-SPMA) 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, a bandpass matching network (BPMN) design is done for a particular square monopole antenna with V-shaped coupling element that has essentially bandwidth increasing effect. Designed BPMN and the antenna forms a VSPMA–BPMN matched antenna structure. “real frequency technique” is employed in the BPMN design. BPMN prototype circuit has been constructed on an FR4 laminate with commercial microwave chip inductors and capacitors. Vector network analyzer gain and reflectance measurements of the matched antenna structure have shown highly compatible results to those of the theoretical design simulations along the passband ( 0.8–4.7 GHz). Furthermore, newly proposed distributed capacitor–resistor lossy model for microstrip lines used in the BPMN circuit have exhibited that it can successfully mimic the measured gain and reflectance performance of the matched structure in passband and even in stopband upto 8 GHz. Designed structure can be utilized as a one single wideband broadcasting medium suitable for many communication standards such as GSM, 3G, and Wi-Fi.
mediterranean microwave symposium | 2013
Cagatay Aydin; Doğu Çağdaş Atilla; Oguzhan Kizilbey; Ramazan Kopru; Tayfun Nesimoglu; Binboga Siddik Yarman
In practical applications, compensating the changes in transistors input and output impedances due to environmental and thermal effects requires tunable matching networks. Having tunability property is critical in manufacturing as well, since manufacturing errors may be compensated by post-production tuning. In this paper, a 12-50 Ω impedance transforming filter over 800-2200 MHz frequency band is chosen and a broadband tunable matching network has been designed using Real Frequency Direct Computational Technique.
International Journal of Rf and Microwave Computer-aided Engineering | 2013
Tayfun Nesimoglu; Cagatay Aydin; Doğu Çağdaş Atilla; Ramazan Kopru; Binboga Siddik Yarman
IU-Journal of Electrical & Electronics Engineering | 2016
Siddik Yarman; Ahmet Aksen; Ramazan Kopru; Narendra Kumar; Cagatay Aydin; Doğu Çağdaş Atilla; Prakash Chacko
mediterranean microwave symposium | 2013
Ramazan Kopru; Cagatay Aydin; Doğu Çağdaş Atilla; Cahit Karakus; Binboga Siddik Yarman
2011 IEEE Indian Antenna Week (IAW) | 2011
Cahit Karakus; Cagatay Aydin; Doğu Çağdaş Atilla; Tayfun Nesimoglu; Siddik Yarman