Yazar "Güneser, Muhammet Tahir" seçeneğine göre listele

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    4.5g uygulamaları için c şekilli ve s şekilli kıvrımlı şeritleri ile kompakt tek bantlı monopole anten
    (2020) Seker, Cihat; Güneser, Muhammet Tahir
    Bu çalışmada, 4.5G uygulamalarında kullanılmak üzere tek kutuplu kompakt mikroşerit bir anten önerilmiştir. Anten, 1,6 mm kalınlığında FR4'ten oluşmaktadır ve S şeklindeki kıvrımlı bir şeridi C şeklindeki şeridin içine basit ve kompakt bir yapı olarak yerleştirilmesi ile düzlemsel beslemeli tek bantlı olarak tasarlanmıştır. Bu yüzden, önerilen anten Ansys HFSS modülünde simüle edilmiştir ve tek frekans aralığında ışıma performansı ve anten kazancı elde edilmiştir. Geri dönüş kaybında -10 dB değeri referans alınarak bant genişliği 54.5 MHz olarak ölçülmüştür ki bu değer 4.5G standardının gereken bant genişliğini kapsamaktadır.
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    Analysis of large-scale path loss model at 33 ghz in indoor laboratory environment
    (2022) Seker, Cihat; Güneser, Muhammet Tahir
    In this study, two important large-scale path loss models, which are the Close-In (CI) model with free space reference distance and Float Intercept (FI) model, were compared in indoor laboratory scenario for fifth-generation (5G) radio systems. Comparisons are conducted using a ray-tracing-based simulation environment at ten different measurement points, at 33 GHz center frequency, and distances between 1,5 to 9 m. According to the results obtained, the one-parameter CI model is simpler and more consistent than the two-parameter FI model. CI model offers better simulation accuracy, greater simplicity, and better iterability between experiments, besides better adaptation to both line-of-sight and non-line-of-sight conditions. In addition, the CI model exhibit high stability at wide frequency ranges.
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    Compact microstrip antenna design for 5g communication in millimeter wave at 28 ghz
    (2019) Güneser, Muhammet Tahir; Seker, Cihat
    In this study, we proposed a compact microstrip monopole antenna, can operating in millimeter wavecommunication. It is consisted of FR4 with thickness of 1.6mm and it was designed as planar-fed single-bandby placing rectangular slots on square patch, as a simple and compact structure. Thus, the proposed antennawas simulated in the Ansys HFSS module and various antenna parameters such as radiation performance andantenna gain were obtained in a single frequency range. The return-loss bandwidth was measured as 716 MHzcentering at 28 GHz, covering the required bandwidth of 5G standard, as a reference of -10 dB..
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    The topologies of multi-input single-output non-isolated dc-dc converter for distributed power generation
    (2021) Seker, Cihat; Güneser, Muhammet Tahir; Kuzey, Şakir
    Today it is an obvious fact that energy consumption tends to increase due to technological developments, population growth, and increasing living standards. In last two decades, renewable energy sources are considered to be the most convenient way to produce clean energy, as it has infinite energy potential. However, most of these alternative systems are not considered sufficient to supply the whole demand alone. But hybrid systems with some alternative energy sources, such as solar, wind, and biomass appear to be a solution to supply the energy needs in the future. In hybrid systems, the DC-DC converter structure is the main device when converting energy for the proper loads. Single/multiple inputs, single/multiple output DC-DC converter topologies vary in design according to the energy demand of the load. Particularly, as the power flow direction differs depending on the energy need and efficiency in energy systems, the usage areas of topologies with bidirectional power flow and fewer circuit elements that reduce system cost and complexity are expanding. In this study, the simulation of multi-input single-output (MISO) DC-DC converter topologies were performed in Matlab / Simulink software. Inductor current and voltage, output current and voltage, as well as output power used in the determining topologies were analyzed. The mathematical equations given in the topologies were confirmed by simulation studies.