Browsing by Author "Caliskan, Fatma"
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Conference Object Citation Count: 0COMPARISON OF COMPUTER-BASED PROPAGATION MODELS WITH EXPERIMENTAL DATA COLLECTED IN AN URBAN AREA AT 1800 MHz(Ieee, 2015) Çalışkan, Fatma; Aydın, Elif; Aydin, Elif; Department of Electrical & Electronics EngineeringNowadays a lot of models are set for the efficient and economic usage of frequency band since the band is a limited source. Therefore, the propagation models created for this purpose were studied in the literature. These models are Free Space Path Loss (Fspl) + Reflection plus Multiple Diffraction (RMD), COST-Hata and COST-WI models. In order to compare the success of the models, electric field strength measurements were taken in a chosen district (Mustafa Kemal Mahallesi Ankara, Turkey) where an irregular structure style can be observed. First set of measurements were recorded at random coordinates and second set of measurements were collected by the following coordinates tracking on a single line. As a conclusion, measured values were compared with the results which were taken from the mentioned models with graphical presentations. The most appropriate model was tried to be found and as another aim of the study, a correction factor was generated as a modification for COST-Hata propagation model.Conference Object Citation Count: 1Design And Analysis Of Rectangular Dielectric Rod Antennas(Ieee, 2015) Çalışkan, Fatma; Aydın, Elif; Caliskan, Fatma; Aydin, Elif; Department of Electrical & Electronics EngineeringIn this study, rectangular dielectric rod antennas with different dimensions and different shapes are designed and analyzed using HFSS simulation software. To analyze the effects of these changes, five different antennas are designed and antenna gains and return loss values are compared.Conference Object Citation Count: 0Design, Analysis and Manufacturing of Dielectric Rod Added Conical Rom Antennas(Ieee, 2016) Çalışkan, Fatma; Özaslan, Alper; Caliskan, Fatma; Department of Electrical & Electronics EngineeringIn this study, ANSYS HFSS (High Frequency Structural Simulator) software had been used. By using this software, dielectric rod added conical horn antennas with various shapes and dimensions had been designed and analyzed. 5 (five) distinct antennas designed and their gains and return losses had been observed to evaluate the effects of the changes. From the results of these comparisons, the proper antenna type was selected and it was manufactured.Conference Object Citation Count: 0Microstrip Antennas For WiMAX Applications(Ieee, 2015) Çalışkan, Fatma; Aydın, Elif; Aydin, Elif; Department of Electrical & Electronics EngineeringIn this paper, four different antenna types have been designed to be used for WiMAX applications. These antennas have been designed using HFSS simulation software. This paper has included the return loss and the radiation pattern of the designed antennas. Using the simulation results, it is shown that these four antennas are working on Wi-Fi and WiMAX frequency ranges.Conference Object Citation Count: 1Modelling of the Slotted Rectangular Waveguide Array Antennas(Ieee, 2015) Çalışkan, Fatma; Aydın, Elif; Ozmen, Zeynep; Caliskan, Fatma; Aydin, Elif; Department of Electrical & Electronics EngineeringIn this study, the slotted rectangular waveguide array (SRWA) antennas' lengths and widths of slots, and the distances between the slots has been changed to observe the radiation properties of the structure. Return loss and radiation pattern graphics of the designs has been obtained using HFSS simulation program. Deviation in resonance frequency and differences in resonance frequency return loss values has been examined on the obtained simulation results.Review Citation Count: 1Numerical and experimental analysis of transverse electromagnetic cell(Wiley, 2016) Çalışkan, Fatma; Demirel, Gulsima; Caliskan, Fatma; Department of Electrical & Electronics EngineeringA transverse electromagnetic (TEM) Cell is able to generate accurate electromagnetic waves from 0 Hz to several MHz. Using this device, Electromagnetic Interference/Compatibility (EMI/EMC) tests of small RF devices can be performed in a regular laboratory environment. Before invention of the TEM Cell, an anechoic chamber environment was needed to perform EMI/EMC tests. However, this approach is costly and restrictive. Using a TEM Cell, it is much less expensive and time consuming. During this study, open and close models of TEM Cells were designed. One of the models was manufactured and tested. Simulation and measurement results were compared with observe the challenges of the study. (c) 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:373-378, 2016.