Küresel dikdörtgensel baskılanmış anten ve anten dizilerinin kovuk yöntemi ile analizi URSI Bilimsel Kongresi



Derivation and analysis of near field tofar field transformation algorithm for spherical scanning
Korkmaz, Hülya; Koç, Seyit Sencer; Department of Electrical and Electronics Engineering (2019)
This thesis focuses on the improvement of a far field transformation algorithm of spherical near field scanning by using different quadrature techniques for numerical integration process. In this thesis, spherical vector wave expansion of E field is studied and numerical calculation for expansion coefficients of E field is performed. In the scope of this study quadrature techniques like Gauss, Trapezoid and Simpsons are investigated and advantages and disadvantages of these techniques are discussed. A decis...
Analysis of spherical-rectangular printed antennas and antenna arrays using cavity model
Demir, Oğuz; Dural Ünver, Mevlüde Gülbin; Department of Electrical and Electronics Engineering (2017)
Printed antennas are commonly used since these antennas are preferred in many applications due to their advantageous properties. In order to employ these antennas in such applications, a thorough investigation and analysis are generally required. Although this can be implemented with fully numerical methods for the sake of high accuracy, the complex calculations required in the process lead to heavy computational load, hence generally demands high quality simulation software. In this thesis, the spherical-r...
Satellite orbit estimation using kalman filters
İpek, Mehmet; Orguner, Umut; Department of Electrical and Electronics Engineering (2017)
In this thesis, satellite orbit determination problem is investigated using various types of Kalman filters based on several ground and space based measurement types. First, the performance of the Gauss' method for initial orbit determination is evaluated and the measurement time separation values required for it to give sufficiently good estimates are determined. Second, filter initialization methods based on a few measurements are proposed for angles only (AE), angles and range (AER), angles and Doppler (...
Cooling curve thermal analyses and oxygen activity analyses for the estimation of microstructural properties of nodular cast iron
Çehiz, Cansın; Kalkanlı, Ali; Department of Metallurgical and Materials Engineering (2019)
Although nodular cast iron grades have mechanical properties competitive with plain carbon steel grades, they have advantage in terms of price due to relatively low raw material and energy costs. Therefore, they are widely used in various industries, especially in automotive, machinery, piping and wind power industries. High number of process variables affecting the solidification behavior of nodular cast iron melt makes it difficult to ensure the resulting microstructure, thus the performance of nodular ca...
Micromechanical modeling of semicrystalline polymers with spherulite morphology
Oktay, Hasan Emre; Göktepe, Serdar; Gürses, Ercan; Department of Civil Engineering (2020-10-23)
In this study, a micromechanical constitutive model for semicrystalline polymers is developed. The proposed model considers interactions among the adjacent regions at the same length scale. The neighborhood information is obtained from the well characterized spherulite morphology of polyethylene. Deformation characteristics of a disk-like spherulite model that has similarities with the considered modeling approach are studied using the finite element method. The model discretizes a disklike spherulite i...
Citation Formats
O. Demir and M. G. Dural Ünver, “Küresel dikdörtgensel baskılanmış anten ve anten dizilerinin kovuk yöntemi ile analizi URSI Bilimsel Kongresi,” 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/79170.