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Title: Adaptive techniques to improve the efficiency of GaN based SSPAs up to C Band for geo synchronous satellites
Researcher: Doshi, Ramesh J.
Guide(s): Deepak Ghodgaonkar
Keywords: t TechniquAdaptive Thermal Managemenes
Geo-Synchronous Satellit
Spacecraft Thermal Materials
University: Dhirubhai Ambani Institute of Information and Communication Technology (DA-IICT)
Completed Date: April 2018
Abstract: quotIn this thesis, various adaptive techniques to improve the efficiency of Solid State Power Amplifier (SSPA) for Geo Synchronous Satellite are presented. The Microwave Power Amplifiers (MPAs) being the most important sub-system determining payload weight, volume, cost and many important link parameters, their performance is improved by novel techniques. Out of various techniques available, the important techniques like flexible (adaptive) output power, flexible frequency and bandwidth, flexible thermal management, adaptive temperature compensation, replacement of Travelling Wave Tube Amplifiers (TWTAs) by Solid State Power Amplifiers (SSPAs) and improvement of reliability of SSPAs are presented in detail. newline newlineLiterature survey on reported techniques to reduce the cost of the satellite services, making the satellite payload flexible and development of newly emerging technology, Gallium Nitride (GaN) based SSPAs to replace the TWTAs are included. The recent development on a new technique so called flexible payload or adaptive payload is described. This new architecture known as of Generic Flexible Payload (GFP) has been proposed by European Space Agency and Astrium, which allows to meet various requirements like evolving business and political landscapes, the emergence of new technologies and applications, or even a change of orbital location or owner. The adaptive or flexible payload allows the user to redefine the frequency plan, redistribute the transmit power between service regions and change the EIRP according to the specific need without scarifying the satellite performance. newline newlineRecent development on GaN based SSPAs by various authors are also included. SSPA being the complex sub-system, especially for Geo-Synchronous Satellite, major specifications including Reliability and Quality Assurance criteria are described in detail. The nominal value of each parameter for 200 watt GaN based SSPA is also given. newline
Pagination: xii, 105p.
Appears in Departments:Department of Information and Communication Technology

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01_title.pdfAttached File254.47 kBAdobe PDFView/Open
02_declaration and certificate.pdf99.31 kBAdobe PDFView/Open
03_acknowledgements.pdf248.13 kBAdobe PDFView/Open
04_contents.pdf391.21 kBAdobe PDFView/Open
05_abstract.pdf250.41 kBAdobe PDFView/Open
06_list of tables.pdf262.4 kBAdobe PDFView/Open
07_list of figures.pdf269.17 kBAdobe PDFView/Open
08_chapter 1.pdf288.05 kBAdobe PDFView/Open
09_chapter 2.pdf388.31 kBAdobe PDFView/Open
10_chapter 3.pdf789.36 kBAdobe PDFView/Open
11_chapter 4.pdf1.02 MBAdobe PDFView/Open
12_chapter 5.pdf664.63 kBAdobe PDFView/Open
13_chapter 6.pdf509.71 kBAdobe PDFView/Open
14_chapter 7.pdf324.59 kBAdobe PDFView/Open
15_chapter 8.pdf429.14 kBAdobe PDFView/Open

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