Download or read book Oversized Elements for High Efficiency Extremely High Frequency Boresight Array written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oversized Elements for High Efficiency Extremely High Frequency Boresight Array written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High gain, planar array antennas which operate at millimetre wave frequencies, and can be mass produced at low cost, are desired by industry. The design of such arrays continues to be academically challenging. A literature review was conducted covering patents and papers describing antenna arrays either operating at, or suitable for operation at, millimetre wave frequencies. Four presently under exploited technology types were identified. Two of the under exploited technologies were investigated. Both small and medium sized arrays of non-radiating edge fed microstrip patches were built up in a consistent process. The design of the patch and 1 x 2 subarray were shown to affect the radiation pattern behaviour of 16 x 16 arrays. The placement of nulls in the 2 x 2 subarray radiation patterns proved critical to the mitigation of grating lobes, which were a source of directivity loss. A considerable difference in directivity characteristics across 10% bandwidth was found between in phase and 180 feeding within the 2 x 2 subarrays. An optimised 180 fed 4 x 4 subarray presented an improvement over prior work. Changing the boundary conditions at the juncture of the base and rim of the cavity of short backfire antennas was found to alter the directivity. Large diameter short backfire antennas with choked, inclined and curved junctures produced high directivity. A readily machinable design was used in a small array, to demonstrate its utility as a high aperture efficiency array element. The results are of importance to the future development of low cost, planar or quasi-planar antenna arrays, particularly at millimetre wave frequencies.

Download or read book Oversized Elements for High Efficiency Extremely High Frequency Boresight Array written by Derek Paul Gray and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ultra Wideband Short Pulse Electromagnetics 4 written by Joseph Shiloh and published by Springer Science & Business Media. This book was released on 1999-11-30 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Generation of High-Power Subnanosecond Pulses.- Fundamental Physical Considerations for Ultrafast Spark Gap Switching.- Novel source of Powerful Subnanosecond Microwave Pulses Based on Superradiance.- Demonstration of Sub-Millimeter Radiation Generation from Static Field by a Superluminous Ionization front in Semiconductor Capacitor Array.- About Mechanism of Wideband Microwave Radiation at Explosion of Condensed High Explosives.- Calorimetric Spectrometer for Measuring Single Microwave Pulses in Relativistic Microwave Electronics Devices.- Universal Sensor Using Electro-Optic Sensing Principl.

Download or read book Elements of Spacecraft Design written by Charles D. Brown and published by AIAA. This book was released on 2002 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation This text discusses the conceptual stages of mission design, systems engineering, and orbital mechanics, providing a basis for understanding the design process for different components and functions of a spacecraft. Coverage includes propulsion and power systems, structures, attitude control, thermal control, command and data systems, and telecommunications. Worked examples and exercises are included, in addition to appendices on acronyms and abbreviations and spacecraft design data. The book can be used for self-study or for a course in spacecraft design. Brown directed the team that produced the Magellan spacecraft, and has taught spacecraft design at the University of Colorado. Annotation c. Book News, Inc., Portland, OR (booknews.com).

Download or read book NASA Scientific and Technical Reports written by United States. National Aeronautics and Space Administration Scientific and Technical Information Division and published by . This book was released on 1967 with total page 2300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fundamentals of Aperture Antennas and Arrays written by Trevor S. Bird and published by John Wiley & Sons. This book was released on 2016-01-19 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended as an advanced text for courses in antennas, with a focus on the mature but vital background field of aperture antennas. The book is aimed at final year, MSc, PhD and Post-Doctoral students, as well as readers who are moving from academia into industry, beginning careers as wireless engineers, system designers, in R&D, or for practising engineers. It assumes the reader has undertaken an earlier course of study on Maxwell's equations, fields and waves. Some of these topics are summarised in the early few chapters in order to provide continuity and background for the remaining chapters. The aperture antennas covered include the main types of horns, reflectors and arrays as well as microstrip patches, reflectarrays and lenses. To provide more than a superficial treatment of arrays, the topic of mutual coupling is covered in greater detail than most similar books in the area. Also included is an introduction to arrays on non-planar surfaces, which is of importance for applications that involve curved surfaces such as in aerodynamics or for making aperture antennas unobtrusive. A chapter is included on some modern aperture antennas to illustrate design techniques beyond the most common types of aperture antennas described in the early chapters. This is to show where advances have recently been made and where they could be improved in the future. Also included are selected topics of a practical nature for aperture antennas, namely fabrication and measurement.

Download or read book A Selected Listing of NASA Scientific and Technical Reports for written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1966 with total page 2088 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Selected Listing of NASA Scientific and Technical Reports for 1966 written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1967 with total page 2084 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Doctoral Dissertations written by and published by . This book was released on 2000 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Introduction to Ultra Wideband Radar Systems written by James D. Taylor and published by CRC Press. This book was released on 2020-09-23 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt: This introductory reference covers the technology and concepts of ultra-wideband (UWB) radar systems. It provides up-to-date information for those who design, evaluate, analyze, or use UWB technology for any application. Since UWB technology is a developing field, the authors have stressed theory and hardware and have presented basic principles and concepts to help guide the design of UWB systems. Introduction to Ultra-Wideband Radar Systems is a comprehensive guide to the general features of UWB technology as well as a source for more detailed information.

Download or read book U S Government Research Development Reports written by and published by . This book was released on 1967 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optical Engineering written by and published by . This book was released on 1993-04 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publishes papers reporting on research and development in optical science and engineering and the practical applications of known optical science, engineering, and technology.

Download or read book Technology for Large Space Systems written by and published by . This book was released on 1984 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Information Communication and Environment written by Adam Weintrit and published by CRC Press. This book was released on 2015-06-03 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing high-quality, scholarly research, addressing development, application and implications, in the field of maritime education, maritime safety management, maritime policy sciences, maritime industries, marine environment and energy technology. Contents include electronics, astronomy, mathematics, cartography, command and control, psycho