Transmitarray antenna designs with high gain bandwith for X and Ka band applications

High-gain antennas play a critical role in meeting the growing demand for data communication in today's world. As a result, innovative solutions such as Transmitarray (TA) technology have come to the forefront. TAs can be described as planar structures that redirect electromagnetic waves and adjust their phases to provide high gain. However, TAs have certain disadvantages, including complex design and manufacturing processes, which lead to increased production costs. Another drawback is their limited bandwidth. In this thesis, three different unit cell designs were initially developed for various TA applications. After simulations confirmed that these designs met TA criteria, they were transformed into TAs. The method employed involved varying the size of the unit elements to achieve the required phase delay. Subsequently, three different TA designs were created with center frequencies of 9 GHz, 10 GHz, and 28 GHz. In the first two designs, named "Tasarım 1 İDA" and "Tasarım 2 İDA," an FR-4 dielectric layer was used, while in the third design, referred to as "Tasarım 3 İDA" was designed using Rogers RT6002. All three designs consist of four layers. The 1-dB and 3-dB gain bandwidths of Tasarım 1 İDA are 12.12% and 49.43%, respectively, with an aperture efficiency of 21.3% at 9 GHz. The 1-dB gain bandwidth of Tasarım 2 İDA is 7.65%, and the 3-dB gain bandwidth is 16.36%, with an aperture efficiency of 18.7% at 10 GHz. The 1-dB gain bandwidth of Tasarım 3 İDA is 7.96%, with an aperture efficiency of 30.84% at 28 GHz. The prototype of Tasarım 1 İDA was produced, and its measurement and simulation results show good agreement. The goal of this thesis is to address the aforementioned disadvantages while simultaneously providing wide gain bandwidth through simple designs and low-cost production. Simulations of the designs were conducted, the prototype of Tasarım 1 İDA was produced, and measurements were taken in the anechoic chamber at the Microwave and Antenna Laboratory of the Electronics and Communication Engineering Department at Kocaeli University.