A5101459261- Antenna Design and Analysis
- Microwave Engineering and Waveguides
- Advanced Antenna and Metasurface Technologies
- Advanced MEMS and NEMS Technologies
- Antenna Design and Optimization
- Electromagnetic Compatibility and Noise Suppression
- Advanced Materials and Mechanics
- 3D IC and TSV technologies
- Advanced Machining and Optimization Techniques
- Particle physics theoretical and experimental studies
- Additive Manufacturing and 3D Printing Technologies
- Adaptive Control of Nonlinear Systems
- Advanced Control Systems Design
- 3D Printing in Biomedical Research
- Advanced machining processes and optimization
- Advanced Surface Polishing Techniques
- Shape Memory Alloy Transformations
- High-Energy Particle Collisions Research
- Radio Frequency Integrated Circuit Design
- Structural Analysis and Optimization
- Tribology and Wear Analysis
- Mechanical Behavior of Composites
- Millimeter-Wave Propagation and Modeling
- Fiber-reinforced polymer composites
- Acoustic Wave Resonator Technologies
Gazi University
2016-2024
Aselsan (Turkey)
2023
Middle East Technical University
2006-2015
A reflectarray antenna monolithically integrated with 90 RF MEMS switches has been designed and fabricated to achieve switching of the main beam. Aperture coupled microstrip patch (ACMPA) elements are used form a 10 × element reconfigurable operating at 26.5 GHz. The change in progressive phase shift between is obtained by adjusting length open ended transmission lines switches. an area 42.46 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
This study investigates the mechanical properties of 3D‐printed plastic parts fabricated using Fused Deposition Modeling (FDM). For this purpose, a 3D printer named KASAME was designed and built by researchers. The test samples were polylactic acid (PLA). experiments conducted three melt temperatures (190°C, 205°C, 220°C), four layer thickness values (0.06 mm, 0.10 0.19 0.35 mm), raster pattern orientations (+45°/−45° [the crisscross pattern], horizontal vertical). Tensile strength tests...
Abstract In the present study, temperature-dependent pseudoelastic behavior of shape memory alloy (SMA) sheets is studied experimentally and by finite element (FE) modeling. For this purpose, mechanical properties for Ni–Ti materials are first obtained using direct tensile three-point bending experiments at 23 °C, 50 80 °C temperatures, respectively. The structure these examined different temperatures SEM images XRD test. Furthermore, FE model, effect temperature on residual deflection...
Traveling wave slot array on cylindrical substrate integrated waveguide (CSIW) is designed, fabricated and measured at K-band. CSIW formed by wrapping the (SIW) around cylinder in circumferential direction. 16 element longitudinal broad wall of single designed Elliot's design procedure. The spacings between elements are determined to reduce half power beam width (HPBW) obtain good matching 25 GHz. A 4 × using each having traveling slots fed 1 SIW divider structure. About 10 ° steering...
This paper presents a reconfigurable triple stub impedance matching network using RF MEMS technology centered at 10GHz. The device is capable of covering impedances on the whole Smith Chart. structure consists three variable length stubs which are designed as distributed transmission lines and two lambda <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g</sub> /8 CPW connecting stubs. implemented with 12 switches over switches. spacing between...
In this paper a reconfigurable reflectarray is designed where the change in progressive phase shift between elements obtained with RF MEMS switches transmission lines of unit composed aperture coupled microstrip patch antenna elements. design, errors due to nonideal design curve and switch type are reduced. It aimed reflected beam broadside 40 degrees. To show validity procedure, prototype 20×20 produced. The measurement results that main can be directed degrees as desired. (6 pages)
Bu çalışmada, quadrotorların dinamiğini büyük ölçüde belirleyen itme ve tork kuvvetleri deneysel olarak ölçülmüş quadrotorun simülasyon modeli üzerinden optimizasyonu gerçekleştirilmiştir. Motor devrinin kontrolünde elektronik hız kontrol kartı kullanılmış darbe genişlik modülasyon (DGM) metodu ile 1100-2000 frekans aralığında edilmiştir. pervane çiftinin kuvveti, değeri devir sayısı ölçümleri verilerin regresyon analizleri motor devrine bağlı Regresyon doğrusal, karesel, kübik sabit...
Longitudinal slot array on broad wall of substrate integrated waveguide (SIW) placed cylindrical surface is designed at 25 GHz for conformal applications where the SIW lies in circumferential direction cylinder.
This paper presents the design of a reconfigurable microstrip slot-coupled patch reflectarray using RF MEMS switches. The is designed on two back-to-back bonded glass substrates front side which contains antenna elements and backside phase shifting elements. consist lines lengths are adjusted with switches resulting adjustable characteristics each element. A transmission line based model used to unit element array obtain curve verified HFSS. 4 × 1 then at 26 GHz verify according HFSS...
Longitudinal slots and coupling between placed on the broad wall of a cylindrical substrate integrated waveguide (SIW) are modeled characterized in order to design slotted SIW array. Characteristics slot bended surface effects radius curvature mutual characteristics investigated at K band using FEM simulator.
Wire Electrical Discharge Machining (WEDM) is a non-conventional manufacturing method known for producing high-quality surface finishes and relies on the condition that materials conduct electricity. However, corner inaccuracies arise in workpieces during cuts with this method. This study aims to investigate using novel approach involving oblique cutting considering parameters such as wire tension (WT), angle, taper ratio, nozzle gap, dielectric flow rate (LQ). The lower upper corners...
Abstract A novel method to reconstruct the energy of hadronic showers in CMS High Granularity Calorimeter (HGCAL) is presented. The HGCAL a sampling calorimeter with very fine transverse and longitudinal granularity. active media are silicon sensors scintillator tiles readout by SiPMs absorbers combination lead Cu/CuW electromagnetic section, steel section. shower reconstruction based on graph neural networks it makes use dynamic reduction network architecture. It shown that algorithm able...
This paper presents a reconfigurable dual-frequency rectangular slot antenna using MEMS technology. fixed-fixed beam type capacitors loading the are actuated electrostatically to change equivalent capacitance of which provides shift in resonant frequencies. The measurement results show very good agreement with simulation and frequencies shifted 1 GHz 350 MHz continuously at around 8.5 10.5 GHz, respectively.
16 × phased array antenna composed of microstrip antipodal tapered slot elements is designed at Ka-band. The element by using infinite simulations to approximate the mutual coupling effects obtain good input match for various beam steering angles in final array. A circular rim with ground plane added suppress grating lobes appear when steered. It shown that lobe suppressed a level less than -20 dB 35 GHz.
Pattern synthesis of a traveling wave longitudinal slot array on the broad wall cylindrical substrate integrated waveguide (CSIW) is presented at 25 GHz. In order to have low side lobe level (SLL) and high directivity, Elliot's design procedure for 1 × slotted applied satisfy required voltage distribution found by aperture projection method evenly distributed with complex distribution. The results are compared which makes use only phase compensation resonant slots using non-uniform spacing...
This paper presents the effects of various transition types from measurement plane to reference in TRL calibration and probe positioning for on wafer measurements CPW based devices. Fourteen different types, with direct, linear exponential transitions, including 3 variations ground-signal-ground (GSG) spacing are examined. To observe performance simple transmission lines characteristic impedances fabricated using standard lithography techniques glass substrate S-parameters measured 4.5-20...
In this study, an innovator, simple, and economical method named roller pre‐stretching is introduced to fabricate polymer‐based composite materials. Stretching technique was applied during vacuum infusion process enhance the linearity of fibers in unidirectional An increasing proportional together with observed on scanning electron microscope (SEM) images. The determined experimental pre‐stretch values were 0, 1.8, 2.7, 4.1, 6.2, 9.1 MPa. effect evaluated under favor tensile three‐point...
A dual polarized compact unit cell antenna element is presented for shared aperture arrays. The composed of two linearly antennas sharing the same both operating at frequency band. has about % 7.06 bandwidth (VSWR<1.22) and isolation between each in more than -43 dB. cross polarization level better -40 dB principle plane. full metal to have only metallic losses. proposed spacing 0.885λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf>...