Σχεδιασμός μικροταινιακής (microstrip) κεραίας κυκλικής πόλωσης για εφαρμογές δορυφορικών τηλεπικοινωνιών
KeywordsAntennas ; Microstrip antennas ; Satellite communications ; LEO satellites ; Circular polarization
The present work addresses the issue of the design of a circularly polarized microstrip antenna, which radiates at 3 GHz, and can be applied to the ground segment of a Low Earth Orbit (LEO) satellite system. The main feature of microstrip antennas is the ease of manufacture, the low cost and limited size, coupled with the fairly good performance they present during their operation, along with the ability of electronic scanning, making them one of the major candidates for satellite systems. These are required to replace the already existing antenna systems operating in the ground segment of a LEO satellite system, which is mainly consisted of parabolic reflectors. These are characterized by their large size, the difficulty in the technical implementation and the limitation of their mechanical scanning. Based on the above, the first step of this research work was the study of the technical characteristics of the microstrip antennas, as a printed circuit element, but also in the number of applications they are used. Exceptional attention was given to the requirements of a LEO satellite system. Finally, after the gradual analysis and design of various models of microstrip antennas using the CST electromagnetic simulator, the NOSCIPRA type of microstrip antenna was created, providing excellent results not only in the reflection coefficient, but mainly in the quality of circular polarization which was the main objective of this work.