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Analysis of the effect of element radiation pattern in the performance of mimo arrays used in imaging applications

Altuntaş, Fırat
Along with the developments in technology, complexity of the systems tends to increase. Consequently rigorous models that take into account of all the effects in such complex systems become very time consuming. In this study, an ultra-wide band (UWB) multi-input multi-output (MIMO) imaging system is considered and a simple model that is generally used in the analysis of such systems is improved with an effort to obtain results closer to those achieved by rigorous models. Simple or rigorous models simulates the data that is received by a receiver antenna when a specified target is illimunated by a transmitter antenna. After obtaining this data for all transmitter receiver pairs, the point spread function (PSF) of the system can be obtained with the utilization of back projection method. In order to verify the proper operation of the implemented simple model, UWB signal characteristics and antenna configuration in the array aperture are analyzed and the results are compared with those found in the literature. After verifying the proper operation of the implemented simple model, antenna radiation pattern is embedded into the calculations and an improved model is obtained. By comparing point spread functions obtained by using the data generated by improved and rigorous models, effect of element radiation pattern on multi-input multi-output (MIMO) imaging vi system is examined. In this thesis, full-wave electromagnetic simulation software CST Studio is used to generate the data of the rigorous model.