Radomlu, Dairesel Polarizasyonlu L1 Bant GPS ve GNSS Anteni Tasarımı
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In this thesis design, analysis and production of the radome covered GNSS antenna which can be used in the wide L1 band frequency range and the radome covered GPS antenna which can be used in L1 band frequency are explained. The measurement results of the produced antennas were compared with the simulation studies in computer environment. Starting from the narrow band GPS patch antenna design with linear polarization in the design phase, GNSS patch antenna design with wide band circularly polarized has been reached and preferred methods have been analyzed by comparative simulations. Finally the patch antennas are covered with radom material; according to the changes in the antenna parameters, the design for the radome antenna was finalized. To obtain a broadband microstrip patch antenna, thick and different substrates was preferred. This method has been analyzed by CST, which is a computer design environment, for different thicknesses and different substrate materials, and the results have been interpreted. The effects of thick substrate usage on the perturbation patch from edge and on the change of the feed point were examined and interpreted by simulations. For the circularly polarized antenna, it has been investigated that the axial ratio values in the desired frequency band are changed with thickness, perturbation amount and antenna dimensions, and the necessary arrangements have been made and the design is brought to the final stage in simulation analysis. In addition to the teflon radome, antennas were simulated with other radome materials with different dielectric constants. Effects of radome material and effects of distance between radome and the patch on antenna parameters are analysed with CST.