Download or read book 20 Watt Solid State X Band Power Amplifier written by W. Lockyear and published by . This book was released on 1976 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: The original objective of this program was to develop a solid state amplifier capable of delivering 20 watts of power in the 7.9 to 8.4 GHz band with 14 dB gain and a 20 dB dynamic range per USA SATCOMA Technical Guidelines, SCA-2161. This included development of four and eight diode circular cavity combiners, development of a hybrid-coupled driver amplifier, design of a dc power supply, packaging and electrical and environmental testing of the final version of the amplifier. Two amplifiers were to be delivered at the end of the program. During the course of the program, the objectives were changed to build one amplifier with a nominal saturated output power of 10 watts but optimized for use at much lower power levels as a linear TWT driver. The specified maximum operating power level was changed to 1.5 watts over the 7.9 to 8.4 GHz band with 38 to 40 dB gain and a 20 dB dynamic range. AN intermodulation product specification of 30 DBc at 200 mW output was added. The number of stages was increased to eight including two four-diode cavity combiners and two hybrid-coupled pairs of stages. Results of the amplifier development work are discussed including RF and dc circuitry and thermal design.

Download or read book High Efficiency RF and Microwave Solid State Power Amplifiers written by Paolo Colantonio and published by John Wiley & Sons. This book was released on 2009-07-08 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Do you want to know how to design high efficiency RF and microwave solid state power amplifiers? Read this book to learn the main concepts that are fundamental for optimum amplifier design. Practical design techniques are set out, stating the pros and cons for each method presented in this text. In addition to novel theoretical discussion and workable guidelines, you will find helpful running examples and case studies that demonstrate the key issues involved in power amplifier (PA) design flow. Highlights include: Clarification of topics which are often misunderstood and misused, such as bias classes and PA nomenclatures. The consideration of both hybrid and monolithic microwave integrated circuits (MMICs). Discussions of switch-mode and current-mode PA design approaches and an explanation of the differences. Coverage of the linearity issue in PA design at circuit level, with advice on low distortion power stages. Analysis of the hot topic of Doherty amplifier design, plus a description of advanced techniques based on multi-way and multi-stage architecture solutions. High Efficiency RF and Microwave Solid State Power Amplifiers is: an ideal tutorial for MSc and postgraduate students taking courses in microwave electronics and solid state circuit/device design; a useful reference text for practising electronic engineers and researchers in the field of PA design and microwave and RF engineering. With its unique unified vision of solid state amplifiers, you won’t find a more comprehensive publication on the topic.

Download or read book Ka Band Wide Bandgap Solid State Power Amplifier written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-24 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of prototype hardware activities related to a 120-W, 32-GHz (Ka-band) solid-state power amplifier (SSPA) architecture study are presented. Spurious mode suppression and the power-handling capability of a prototype 24-way radial combiner and a prototype 2-way septum binary combiner were investigated. Experimental data indicate that a commercial absorptive filter, designed to pass the circular TE01 mode, effectively suppressed the higher-order modes generated by a narrowband, flower-petal-type mode transducer. However, the same filter was not effective in suppressing higher-order modes generated by the broadband Marie mode transducer that is used in the prototype waveguide radial combiner. Should greater filtering be required by a particular SSPA application, a broadband mode filter that can suppress specifically those higher-order modes that are generated by the Marie transducer will need to be developed. A back-to-back configuration of the prototype radial combiner was tested with drive power up to approximately 50 W. No anomalous behavior was observed. Power measurements of the septum combiner indicate that up to 10-W radio frequency (RF) can be dissipated in the integrated resistive element before a permanent performance shift is observed. Thus, a given adder (a single-stage, 2-way combiner) can safely combine two 20-W sources, and the adder will not be damaged in the event of a source failure. This result is used to calculate the maximum source power that can be safely combined as a function of the number of sources combined and the number of source failures allowed in a multi-stage combiner. The analysis shows that SSPA power >140 W can be generated by power combining 16 sources producing 10 W each. In this configuration, up to three sources could fail with the guarantee that the combiner would not be damaged. Finally, a modified prototype septum combiner design was verified. The improved design reduced the assembly time from over 2 hours to about 15

Download or read book Implementation of Novel Power Combining Techniques on Solid State Power Amplifier SSPA Chip Designs to Improve Efficiency and Power Performance written by Caroline W. Waiyaki and published by . This book was released on 2012 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current communication systems at Ka-band are using traveling wave tube amplifiers (TWTAs) that are bulky, costly and require high-voltage power supplies. Advances on solid state device technologies with benefits such as low supply voltage, graceful degradation, lower development cost, and high power densities have made solid state power amplifiers (SSPAs) very attractive as TWTA replacements. These attributes are beneficial to the military's need for reducing size, weight, and prime power (SWAP) and cost of the existing electronic components. The Gallium Arsenide (GaAs) device technology has been the workhorse of the solid state power amplifiers (SSPAs) for the last two decades and has demonstrated maturity at the Ka-band frequencies. Gallium Nitride (GaN), though less mature, is increasingly becoming the technology of choice for high frequency, high power applications due to its desirable attributes (i.e. high breakdown fields, high power density, and high electron saturation velocity). The SSPA modules currently available at Ka-band are based on GaAs device technology and utilize very low power (2W) and less efficient (20% power added efficiency (PAE)) monolithic microwave integrated circuits (MMICs). There is a need to improve the power and efficiency of current MMICs by incorporating on-chip planar power combining. This research focuses on the design of a highly efficient multi-watt SSPA chip at Ka-band for space, defense and commercial wireless communications applications. GaAs- and GaN- based device technologies are utilized in this research to demonstrate the feasibility of achieving multi-watt PAs with 40% PAE at Ka-band. Class AB biasing has been chosen for the design to obtain a good compromise between linearity and efficiency performances. Additionally, a novel planar power combining network that incorporates harmonic suppression, Wei-Chi, is implemented in the chip design to improve on the power and efficiency performance without degrading linearity performance. This Wei-Chi combiner performance is also compared to the Wilkinson combiner, which is commonly used in MMIC design. S-band GaN-based microwave integrated circuits (MICs) using Cree's 10W GaN HEMT packaged devices were designed to verify the feasibility of the approach. The MMIC designs for this work included a GaAs-based chip using Triquint's 0.13&mgr;m pHEMT process and a GaN-based chip on Triquint's 0.15&mgr;m GaN on SiC HEMT process. Both designs implemented the Wei-Chi combiner at Ka-band. The GaAs MMIC design has demonstrated measured output power of 22 dBm and 39.32 % PAE at 26.5 GHz. In addition, the simulated results for the GaN MMIC design are presented in this research. The GaN MMIC is expected to deliver 2W output power with 40% PAE. -- Abstract.

Download or read book Ka Band Wide Bandgap Solid State Power Amplifier written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-24 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Motivated by recent advances in wide-bandgap (WBG) gallium nitride (GaN) semiconductor technology, there is considerable interest in developing efficient solid-state power amplifiers (SSPAs) as an alternative to the traveling-wave tube amplifier (TWTA) for space applications. This article documents proof-of-concept hardware used to validate power-combining technologies that may enable a 120-W, 40 percent power-added efficiency (PAE) SSPA. Results in previous articles [1-3] indicate that architectures based on at least three power combiner designs are likely to enable the target SSPA. Previous architecture performance analyses and estimates indicate that the proposed architectures can power combine 16 to 32 individual monolithic microwave integrated circuits (MMICs) with >80 percent combining efficiency. This combining efficiency would correspond to MMIC requirements of 5- to 10-W output power and >48 percent PAE. In order to validate the performance estimates of the three proposed architectures, measurements of proof-of-concept hardware are reported here. Epp, L. and Khan, P. and Silva, A. Glenn Research Center; Jet Propulsion Laboratory IPN-PR-42-163

Download or read book Handbook of RF and Microwave Power Amplifiers written by John L. B. Walker and published by Cambridge University Press. This book was released on 2012 with total page 705 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a one-stop guide for circuit designers and system/device engineers, covering everything from CAD to reliability.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Tech Briefs written by and published by . This book was released on 1980 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Flying Magazine written by and published by . This book was released on 1962-11 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Information Sciences and Human Factors Program Annual Report 1987 written by United States. National Aeronautics and Space Administration. Information Sciences and Human Factors Division and published by . This book was released on 1988 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamics of Meteor Outbursts and Satellite Mitigation Strategies written by Glenn E. Peterson and published by AIAA. This book was released on 1999 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: The potential threat posed by Leonid meteroids to orbiting spacecraft over the next several years calls for new dynamic mitigation strategies to assist the satellite community in reducing the danger to its vehicles. This book offers deliberate dynamic mitigation strategies to complement the traditional shielding strategies, providing mission operators additional ways to decrease the danger. Five different attitude control and orbit maneuvering options are examined in detail. The information is presented in algorithmic form to allow technically competent, but meteoroid inexperienced, operators to easily understand the phenomena, assess the danger, and implement procedures. Although general in scope, the book emphasizes the Leonid meteor events of the 1998-2002 timeframe.

Download or read book Gallium Nitride GaN written by Farid Medjdoub and published by CRC Press. This book was released on 2017-12-19 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Addresses a Growing Need for High-Power and High-Frequency Transistors Gallium Nitride (GaN): Physics, Devices, and Technology offers a balanced perspective on the state of the art in gallium nitride technology. A semiconductor commonly used in bright light-emitting diodes, GaN can serve as a great alternative to existing devices used in microelectronics. It has a wide band gap and high electron mobility that gives it special properties for applications in optoelectronic, high-power, and high-frequency devices, and because of its high off-state breakdown strength combined with excellent on-state channel conductivity, GaN is an ideal candidate for switching power transistors. Explores Recent Progress in High-Frequency GaN Technology Written by a panel of academic and industry experts from around the globe, this book reviews the advantages of GaN-based material systems suitable for high-frequency, high-power applications. It provides an overview of the semiconductor environment, outlines the fundamental device physics of GaN, and describes GaN materials and device structures that are needed for the next stage of microelectronics and optoelectronics. The book details the development of radio frequency (RF) semiconductor devices and circuits, considers the current challenges that the industry now faces, and examines future trends. In addition, the authors: Propose a design in which multiple LED stacks can be connected in a series using interband tunnel junction (TJ) interconnects Examine GaN technology while in its early stages of high-volume deployment in commercial and military products Consider the potential use of both sunlight and hydrogen as promising and prominent energy sources for this technology Introduce two unique methods, PEC oxidation and vapor cooling condensation methods, for the deposition of high-quality oxide layers A single-source reference for students and professionals, Gallium Nitride (GaN): Physics, Devices, and Technology provides an overall assessment of the semiconductor environment, discusses the potential use of GaN-based technology for RF semiconductor devices, and highlights the current and emerging applications of GaN.

Download or read book Department of Housing and Urban Development independent Agencies Appropriations for 1983 written by United States. Congress. House. Committee on Appropriations. Subcommittee on HUD-Independent Agencies and published by . This book was released on 1982 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Array Systems Applications and RF Technologies written by Nicholas Fourikis and published by Academic Press. This book was released on 2000-05-31 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Array Systems, Applications and RF Technologies adopts a holistic view of arrays used in radar, electronic warfare, communications, remote sensing and radioastronomy. Radio frequency [RF] and intermediate frequency [IF] signal processing is assuming a fundamental importance, owing to its increasing ability to multiply a system's capabilities in a cost-effective manner. This book comprehensively covers the important front-end RF subsystems of active phased arrays, so offering array designers new and exciting opportunities in signal processing. This book: * provides an up to date record of existing systems from different applications * explores array systems under development * bridges the gap between textbook coverage of idealized phased arrays and practical knowledge of working phased arrays * recognises the significance of cost to the realization of phased arrays * discusses future advances in the field that promise to deliver even more affordable arrays ['intelligent' or self-focussing/-cohering arrays] Engineers and scientists in the radar and RF technology industry will welcome the detailed description of array elements, polarisers, T/R modules and beamformers in Advanced Array Systems, Applications and RF Technologies. This book is also appropriate for postgraduate and advanced undergraduate students in electronic engineering, and for technical managers, researchers and students in the fields of radioastronomy and remote sensing. This book is a volume in the Signal Processing and its Applications series, edited by Richard Green and Truong Nguyen.

Download or read book Conference Proceedings 20th European Microwave Conference 90 written by European Microwave Conference and published by . This book was released on 1990 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book EPR Spectroscopy written by Daniella Goldfarb and published by John Wiley & Sons. This book was released on 2018-03-06 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique, self-contained resource is the first volume on electron paramagnetic resonance (EPR) spectroscopy in the eMagRes Handbook series. The 27 chapters cover the theoretical principles, the common experimental techniques, and many important application areas of modern EPR spectroscopy. EPR Spectroscopy: Fundamentals and Methods is presented in four major parts: A: Fundamental Theory, B: Basic Techniques and Instrumentation, C: High-Resolution Pulse Techniques, and D: Special Techniques. The first part of the book gives the reader an introduction to basic continuous-wave (CW) EPR and an overview of the different magnetic interactions that can be determined by EPR spectroscopy, their associated theoretical description, and their information content. The second provides the basics of the various EPR techniques, including pulse EPR, and EPR imaging, along with the associated instrumentation. Parts C and D builds on parts A and B and offer introductory accounts of a wide range of modern advanced EPR techniques, with examples of applications. The last two parts presents most of the new advances that do not appear in most of the classical EPR textbooks that focus on CW EPR. EPR Spectroscopy: Fundamentals and Methods contains, in concise form, all the material needed to understand state-of-the-art EPR spectroscopy at the graduate school/research level, whilst the editors have ensured that it presents the topic at a level accessible to newcomers to the field and others who want to know its range of application and how to apply it.