LIYAMBO, E. Fázovaná anténní řada integrovaná do substrátu [online]. Brno: Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií. 2022.
The thesis was aimed to verify functionality of a published phased antenna array by numerical simulations. If approved, the array concept was asked to be re-designed for materials and manufacturing technologies available at the university. Manufacturing of the phased array was not requested. Functionality of tunable substrate-integrated waveguide (SIW) phase shifters, aperture-coupled patch elements and a complete phase array was verified by simplified and realistic simulations. Since the functionality was approved, the phased array design was adapted to available manufacturing accuracy and available substrates. The influence of a lower manufacturing precision and conventional substrates of antenna parameters was deeply discussed. Using single- and multi-objective optimization, degradation of parameters of the re-designed structure was attempted to be compensated. Hence, all goals of the thesis were fully met. The student worked on the diploma project hardly during two semesters. All the important questions related to the solution were deeply discussed. Since the thesis fully met my expectations, I recommend the evaluation by 95 points.
In his diploma thesis, the student dealt with the design of a two-element phased array antenna integrated into the substrate in the Ka band. In the first chapter, he researched the given issue and chose an antenna structure, divider and phase shifter. In the following part of the work, he verified the specified structure with different materials of the phase shifter, its dimensions and mutual configuration. He compared the results of SIW antenna array simulations with the properties of an antenna array with waveguide structure. Considering the number of input parameters, the work can be described as very demanding, and in his work the student progressed logically from individual components to the entire system without beam steering to the final configuration with optimization of individual dimensions. Due to the scope of the work, it is clear that there was no more space for the realisation of the proposed antenna array and the verification of their properties with the results of the simulation. I consider the resulting antenna characteristic as well as the SLL, even in the case of steering, to be among the strengths of the presented thesis. The thesis assignment was completed. I consider the submitted work to be successful and recommend it for defense.
eVSKP id 141544