Sürdürülebilir Kalkınma Amaçları

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Araştırmacılar(2)

• Coşkun, Aykut
• Çakır, Mehmet

• MakaleAçık Erişim2025/r/bayburt/14295
  Two-and four-way Wilkinson power divider design with slow-wave microstrip structures

  Çakir, Mehmet; Karpuz, Ceyhun

  In this study, conventional Wilkinson power dividers have been modified with meandered transmission line structures, resulting in two-port power dividers with either two or three serial connections and four-port power dividers with two serial connections. A substrate with a relative permittivity of 10.2 and a height of 1.27 mm, RT/Duroid, was used for the designs, and frequency responses were optimized using an electromagnetic simulation program. To enhance isolation and bandwidth, 100-ohm resistors were placed at each connection point in the power dividers. In the two-port configuration with two serial connections, the average return loss was-14.45 dB, insertion loss was-3.40 dB, and isolation was-13.25 dB over the 0.17-1.36 GHz band. Additionally, in the 2.24-2.97 GHz frequency band, the return loss was-15.45 dB, insertion loss was-3.50 dB, and isolation was-15.93 dB. In the three-port configuration with three serial connections, the average return loss was-14.73 dB, insertion loss was-3.38 dB, and isolation was-12.20 dB over the 0.11-1.05 GHz range;-15.21 dB return loss,-3.54 dB insertion loss, and-15.34 dB isolation over the 1.36-2.10 GHz range; and-17.52 dB return loss,-3.65 dB insertion loss, and-14.03 dB isolation over the 2.59-3.14 GHz range. In the four-port configuration with two serial connections, the average return loss was-20.65 dB, insertion loss was-6.17 dB, and isolation was-16.74 dB in the 0.47-1.17 GHz range. The designed circuits were fabricated, and it was observed that the simulation results were consistent with the measurement results.

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  AtıfWoS1·TR Dizin1

  İncele
• MakaleAçık Erişim2023/r/bayburt/16511
  Eliptik Şekilli Metayüzeye Dayalı Geniş Bant Polarizasyon Dönüşümü

  Teber, Ahmet; Ertugrul, Mehmet; Coşkun, Aykut

  Burada, geniş bant yansıtıcı doğrusal polarizasyon (LP) ve dairesel polarizasyon (CP) dönüşümlerini gerçekleştirmek için tek katmanlı, ultra ince, çok işlevli ve yüksek verimli bir meta-yüzey sunulmaktadır. Önerilen meta-yüzey, %97'den fazla verimlilikle %55.2'lik (7.89-13.91 GHz) nispi absorpsiyon bant genişliği (RAB) üzerinde doğrusal polarize dalga için mükemmel bir çapraz polarizasyon dönüştürücü görevi görür. Doğrusal polarize dalgaları 7.2–7.36 GHz frekans aralığında başarıyla dairesel polarize dalgalara dönüştürür. Ek olarak, TE ve TM modları için polarizasyon dönüşüm oranı (PCR) verimlilik özellikleri, 45⁰'ye kadar geniş bir geliş açısı ile tüm X bandında korunur. Sunulan polarizasyon dönüştürücü, 0.07λ0 kalınlık ile ultra ince bir özelliğe sahiptir. Kompakt boyutu, açısal kararlılığı, yüksek verimliliği, basit yapısı ve çok işlevliliği nedeniyle bu polarizasyon dönüştürücü, birçok uygulamada polarizasyon manipülasyonu ve iletişim cihazları için önemli bir adaydır.

  AtıfOpenAlex1

  İncele
• MakaleAçık Erişim2019/r/bayburt/14984
  Design of Asynchronous Motor With 3 Phase 600 kW Power Short Circuit Cage Rotor: Physical Dimensioning and Electrical Calculations

  Kaya, Yunus Mustafa; Coşkun, Aykut

  Asynchronous motors with short circuit caged rotor are easy to build, durable, high operational safety, low maintenance requirements and cheaper than their counterparts, so they are widely used in industry and in many areas. In this study, design of asynchronous motor with short circuit caged rotor with 3 phase, 600 kW active power, mains voltage 400 V, operating frequency 50 Hz, pole pair 2, pole number 4, efficiency 0.95 and power factor 0.93, physical dimensioning and electrical calculations were made. Firstly, main dimensions of motor according to the design criteria and performance values defined, then physical dimensioning of the stator and rotor and electrical calculations, inductions and magnetic field intensities, stator and rotor weights, losses, and efficiency were calculated. The results of the analysis showed that the designed asynchronous motor meets the required power values and design performance criteria.

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