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Öğe Coverage Prediction for Double Diffraction Scenarios(Ieee, 2018) Arik, Eray; Tabakcıoğlu, Mehmet BarışPrediction of coverage is very important in order to increase QoS and determine blind spot in communication systems. Obstructions in the scenarios can block the rays emanating from the transmitter and reaching on the receiver. UTD model can be used to determine whether threshold electric field on the receiver is provided or not. In this study, double diffraction coefficient and spreading factors are derivated and it is used in electric field strength calculation. In addition, some comparisons are made by FEKO electromagnetic solver software.Öğe Reducing EMI by Multiple Slits Shielding(Ieee, 2017) Arik, Eray; Tabakcıoğlu, Mehmet BarışElectromagnetic compatibility (EMC) is vital for health and more reliable electric and electronics systems. All electronic devices have to provide EMC tests. In order to increase the quality of service of all electronic devices, a shielding mechanism has to be provided in order to eliminate electromagnetic interference (EMI). In this study a multi-slits shielding mechanism is proposed by using Uniform Theory of Diffraction and geometrical optic models. Multi-slits structure does not permit passing the direct field much and provide dominant field contribution from diffracted field. Due to using diffracted field instead of direct field, EMI is reduced.Öğe Using of S-UTD-CH Model in Coverage Mapping and Comparison with FEKO Software(Ieee, 2017) Arik, Eray; Tabakcıoğlu, Mehmet BarışFree space electromagnetic wave propagation is an extremely simple case. However, in the reality, there are some obstacles like hills and buildings and electromagnetic waves are diffracted and reflected form these obstacles. It is a vital problem that how an electromagnetic wave propagates in the region including multiple diffraction. Many electromagnetic wave propagation models are developed in order to map coverage and install base station in optimum number and power. S-UTD-CH model, which is an optimum models according to computation time and accuracy of prediction, can be used in coverage mapping. In this study, after giving some brief information about S-UTD-CH model, coverage map is generated by a sample scenario. Moreover, this model is compared with FEKO electromagnetic wave simulation software tool.