Browsing by Author "Caliskan,F."

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Citation - Scopus: 4
Comparison of computer-based propagation models with experimental data collected in an urban area at 1800 MHz
(Institute of Electrical and Electronics Engineers Inc., 2015) Acar,T.; Caliskan,F.; Aydin,E.
Nowadays 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. © 2015 IEEE.
Microstrip Antennas for Wimax Applications;
(Institute of Electrical and Electronics Engineers Inc., 2015) Demirci,T.; Caliskan,F.; Aydin,E.
In 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. © 2015 IEEE.