الفهرس 
A Comprehensive Review of Satellite Operating Bands, Antenna Types, and Advanced Technologie
Final assessment and comparison with recent X-band antenna designsOnly 14 pages are availabe for public view
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Abstract
This thesis presents an extensive and in-depth investigation into satellite communication systems and their associated antenna designs, with a specific focus on optimizing performance for X-band satellite applications. The research conducted within this thesis aims to enhance the efficiency, compactness, and overall effectiveness of satellite communication systems operating within the X-band frequency range.
To lay the groundwork for the subsequent research, an exhaustive review of satellite operating bands and various types of satellite antennas is provided. This review encompasses fractal antennas, substrate integrated waveguide antennas, and transparent antennas, which are explored in terms of their unique characteristics, capabilities, and potential applications within X-band satellite communication.
Building upon this foundation, the thesis proceeds to examine and optimize several innovative antenna designs tailored specifically for X-band satellite applications. These designs include an M-shaped polygonal slot antenna with an embedded island, a transparent variant of the M-shaped polygonal slot antenna, an exponential slot antenna with an embedded rectangular island, a spidron-fractal slot antenna with an embedded rectangular island, and a circularly polarized double-walled substrate integrated waveguide (SIW) fractal slot antenna array.
Each of these antenna designs exhibits exceptional performance across a range of critical metrics, including bandwidth, polarization, gain, compactness, and overall efficiency. Through a comprehensive approach encompassing simulations, fabrication, and meticulous measurements on fabricated prototypes, the designs are rigorously analyzed to ensure their reliability, efficacy, and suitability for practical implementation within X-band satellite communication scenarios.
The findings and outcomes of this thesis make significant contributions to the advancement of satellite communication systems and antenna designs, specifically within the X-band frequency range. The research outcomes provide valuable insights into the intricacies of antenna design and optimization, offering a solid foundation for the development of more efficient, compact, and high-performing solutions for X-band satellite communication systems. Ultimately, this thesis serves as a comprehensive and valuable resource for researchers, engineers, and practitioners working in the field of satellite communication systems. The knowledge and insights gained from this research pave the way for future advancements, leading to improved performance, reliability, and compactness of satellite communication systems operating within the demanding X-band frequency range. The thesis is divided into nine chapters. Chapter 1 introduces planar antennas for satellite applications, discussing different types of satellites and their impact on antenna design. It also highlights the advantages of satellite X-band and presents the problem statement and research objectives. Chapter 2 provides a literature survey on satellite operating bands and various types of antennas, including fractal antennas and substrate integrated waveguide antennas. Chapter 3 presents mathematical derivations for the E-field and H-field components of a rectangular slot antenna. It also derives a formula for the directivity and gain of the antenna. Chapter 4 discusses the design, simulation, fabrication, and measurements of a circularly polarized polygonal M-shaped slot antenna for X-band satellite applications. It includes analysis of the results and introduces an equivalent circuit model. Chapter 5 introduces a method for achieving transparency in antennas and designs a circularly polarized transparent polygonal M-shaped slot antenna. Chapter 6 presents a circularly polarized exponential slot antenna with a rectangular patch island and discusses its design, simulation, fabrication, and measurements. Chapter 7 introduces the spidron fractal shape and designs a circularly polarized spidron fractal slot antenna with a rectangular patch island. Chapter 8 explores circularly polarized antenna designs based on substrate integrated waveguide (SIW) with spidron fractal slot and hexagonal slot configurations. It includes designs for single-element and multi-element antenna arrays using SIW. Chapter 9 concludes the thesis, summarizing the primary findings and their contributions to the field. It also discusses limitations and suggests future research directions