دانلود کتاب آنتن‌های ایستگاه زمینی ماهواره -طراحی مهندسی برق، مکانیک و عمران

Billions of people depend daily on the essential technology of satellite ground station antennas. This monograph captures the entire technology in all its aspects. It includes material for engineers specifying, designing both the RF and weather protection, overseeing site construction, and doing the final compliance testing of satellite ground station antennas. Managers planning these projects will find the help they need. You could read the book from cover to cover, but you can just as easily read thematerial required for your assignment. If a mathematical derivation is confusing, you lack the background, or it seems unimportant to you, skip it, and read on. You will not miss much. It takes a team of experts to specify, design, construct, and test a satellite ground station. Roland Schwerdtfeger, a lifelong learner, focused on satellite ground stations. He started early doing limited hands-on design of small elements. Meanwhile, he slowly learned all aspects of the total system as he expanded his interest in the components of design. His unbounded curiosity led him to devise methods for the final testing of the completed installation. As older engineers left the field, he took on the responsibility of teaching younger engineers all he had learned by either absorbing what his predecessors had taught him or educating himself when new requirements arose. Customers and their engineers who specified the system needed to understand how to generate meaningful specifications so he started teaching them. This book began with Roland’s manuscript and his collection of additional material. Located in Roland’s additional material we found further revisions because he was always improving his presentation. Companies building antennas today shared with us information about theirmanufacturing methods. The three of us from industry, who worked with Roland, have taken on two tasks: updating his material to include newer designs and methods revolutionizing the field, and the details of book production while correcting small errors. Chapter 1 covers specifying the communication system from satellite geometry, propagation of signal including polarization, channel capacity, and limitations of environmental and equipment-generated noise to generate antenna size for a particular frequency of operation. The following four chapters illustrate design methods: reflectors, feeds, and construction methods including ground positioners. Chapter 6 shows the performance effects of weather protection including radomes. Radiation transmitted by the antennas affects neighboring communication and possible personnel radiation hazards. The final chapter gives the methods of final testing including the use of radio stars. The authors hope the book will serve as a continuing source of design methods.