Download or read book Fixed frequency Beam steerable Leaky wave Antennas microform written by Karam M. (Karam Michel) Noujeim and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1998 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fixed frequency Beam steerable Leaky wave Antennas written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fixed frequency Beam steerable Leaky wave Antennas written by Karam M. Noujeim and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed description of the fundamentals of operation of two fixed-frequency beam-steerable leaky-wave antennas developed during the course of this research is presented. This is accompanied by measurements used to validate the theories developed herein. A study is presented of the wave propagation along the first of these antennas, a periodically loaded leaky-wave microstrip. The theoretical predictions linking the phase velocity along such an antenna to the values of the voltage-controlled capacitors placed at regular intervals along it are verified experimentally. It is found that the phase velocity along the antenna can be varied continuously by properly adjusting the DC voltage across its capacitors. This effect is used to achieve continuous fixed-frequency main-beam steering. Analysis is also given of the wave propagation along the second antenna, a leaky waveguide made up of a set of parallel strips periodically loaded with voltage-controlled capacitors and printed on a grounded dielectric slab. It is found that the phase velocity along such an antenna, and thus the direction of its main-beam maximum can be controlled continuously at constant frequency by properly adjusting the DC voltage across its capacitors. Finally, the effect of the dielectric constant on the scan range of fixed-frequency periodically loaded leaky-wave microstrip and leaky-waveguide antennas is addressed. Expressions for the radiation efficiency, power gain, radiated power, and power dissipated in the various parts of these antennas are derived. In addition, the response of these antennas to harmonic and intermodulation interference is experimentally investigated, and is followed by a set of measurements that address the issue of radiation from the sides of leaky-waveguide antennas.
Download or read book Millimeter Wave Holographic Leaky Wave Antennas with Mechanical Beam Steering at 28 GHz written by and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photonic Assisted Beam Steering Via Leaky Wave Antennas for Wireless Communication and Radar written by Matthias Steeg and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Millimeter Wave Antennas Using Gap Waveguides with Beam Steerability at Fixed Frequencies for 5G Mobile Communications written by and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Compact Leaky Wave Antenna Using Ferroelectric Materials written by Hyung Min Jeon and published by . This book was released on 2012 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leaky wave antenna continuously attracts a lot interests for tuning the radiation direction over a large angle. Various types of leaky wave antenna have been developed since 1940. However, most of these leaky wave antennas suffered from their excessive volume and the required wide range of operating frequency (bandwidth) to achieve a large tuning angle. To circumvent these challenges, research in this thesis is focused on implementation of material (like PZT) with high dielectric constant (k) in a rectangular waveguide leaky wave antenna. Due to the high dielectric constant of PZT ~ 1,900, the propagation wavelength in the waveguide can be dramatically shortened. This allows the leaky wave antenna to be operated at much lower frequency, or to have a significant volume reduction. In addition, using high k material enables bandwidth narrowing. In experiments, 70 degree tuning angle was observed by changing frequency from 2.1217 GHz to 2.235 GHz in a proto-type leaky wave antenna filled with material of . The tuning angle can be further adjusted by the slot length and distance.
Download or read book Electromagnetics in a Complex World written by Innocenzo Pinto and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides the state of the art of modelling, simulation and calculation methods for electromagnetic fields and waves and their application.
Download or read book Electromagnetics and Network Theory and their Microwave Technology Applications written by Stefan Lindenmeier and published by Springer Science & Business Media. This book was released on 2011-07-13 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a discussion of the challenges and perspectives of electromagnetics and network theory and their microwave applications in all aspects. It collects the most interesting contribution of the symposium dedicated to Professor Peter Russer held in October 2009 in Munich.
Download or read book Antenna Systems written by United States. Department of the Air Force and published by . This book was released on 1953 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Time Domain Methods in Electrodynamics written by Peter Russer and published by Springer Science & Business Media. This book was released on 2008-09-26 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consists of contributions given in honor of Wolfgang J.R. Hoefer. Space and time discretizing time domain methods for electromagnetic full-wave simulation have emerged as key numerical methods in computational electromagnetics. Time domain methods are versatile and can be applied to the solution of a wide range of electromagnetic field problems. Computing the response of an electromagnetic structure to an impulsive excitation localized in space and time provides a comprehensive characterization of the electromagnetic properties of the structure in a wide frequency range. The most important methods are the Finite Difference Time Domain (FDTD) and the Transmission Line Matrix (TLM) methods. The contributions represent the state of the art in dealing with time domain methods in modern engineering electrodynamics for electromagnetic modeling in general, the Transmission Line Matrix (TLM) method, the application of network concepts to electromagnetic field modeling, circuit and system applications and, finally, with broadband devices, systems and measurement techniques.
Download or read book Pediatric Retina written by James D. Reynolds and published by Springer Science & Business Media. This book was released on 2010-09-14 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pediatric retinal diseases are not simply retinal diseases that occur in children; rather, they are unique disorders that often are not found in adults. This textbook of the pediatric retina offers in-depth guidance on congenital and acquired diseases of the retina in the pediatric population. It is organized according to disease onset and timing, as well as anatomy. All chapters are written by leading authorities in the field from both the pediatric and the retinal perspective. A multidisciplinary approach to the topic is adopted, and critical information is included on disease classification and diagnosis, pathophysiology, genetics, complications, and prognosis. Pediatric Retina will be a useful source of information for pediatric ophthalmologists, retina specialists, and other eye care providers who care for children.
Download or read book Physical Control Methods in Plant Protection written by Charles Vincent and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Jointly published with INRA, Paris. Pesticide resistance is becoming more frequent and widespread with more than 500 insect species known to have become resistant to synthetic insecticides. On the other hand, consumers increasingly demand agricultural products without any pesticide residues. This book, for the first time, shows the alternative: solely physical methods for plant protection by means of thermal, electromagnetic, mechanical and vacuum processes. A glossary rounds up this extremely valuable book.
Download or read book Feedback and Control for Everyone written by Pedro Albertos and published by Springer Science & Business Media. This book was released on 2010-06-10 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: This intriguing and motivating book presents the basic ideas and understanding of control, signals and systems for readers interested in engineering and science. Through a series of examples, the book explores both the theory and the practice of control.
Download or read book Microwave Tomography written by Sima Noghanian and published by Springer. This book was released on 2014-07-08 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a detailed overview on the use of global optimization and parallel computing in microwave tomography techniques. The book focuses on techniques that are based on global optimization and electromagnetic numerical methods. The authors provide parallelization techniques on homogeneous and heterogeneous computing architectures on high performance and general purpose futuristic computers. The book also discusses the multi-level optimization technique, hybrid genetic algorithm and its application in breast cancer imaging.
Download or read book Complex Computing Networks written by Izzet Cem Göknar and published by Springer. This book was released on 2010-11-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the ceremonials and the proceedings pertaining to the Int- national Symposium CCN2005 on “Complex Computing-Networks: A Link between Brain-like and Wave-Oriented Electrodynamics Algorithms,” convened at Do ?u ? University of Istanbul, Turkey, on 13–14 June 2005, in connection with the bestowal of the honorary doctorate degrees on Professors Leopold B. Felsen and Leon O. Chua, for their extraordinary achievements in electromagnetics, and n- linear systems, respectively. The symposium was co-organized by Cem Göknar and Levent Sevgi, in consultation with Leopold B. Felsen and Leon O. Chua. Istanbul is a city with wonderful natural and historical surroundings, a city not only interconnecting Asia and Europe but also Eastern and Western cultures. Therefore, CCN2005 was a memorable event not only in the lifetime of Drs. Felsen, Chua, and their families, but also for all the other participants who were there to congratulate the recipients and participate in the symposium.
Download or read book The Singularity Is Near written by Ray Kurzweil and published by Penguin. This book was released on 2005-09-22 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt: NEW YORK TIMES BESTSELLER • Celebrated futurist Ray Kurzweil, hailed by Bill Gates as “the best person I know at predicting the future of artificial intelligence,” presents an “elaborate, smart, and persuasive” (The Boston Globe) view of the future course of human development. “Artfully envisions a breathtakingly better world.”—Los Angeles Times “Startling in scope and bravado.”—Janet Maslin, The New York Times “An important book.”—The Philadelphia Inquirer At the onset of the twenty-first century, humanity stands on the verge of the most transforming and thrilling period in its history. It will be an era in which the very nature of what it means to be human will be both enriched and challenged as our species breaks the shackles of its genetic legacy and achieves inconceivable heights of intelligence, material progress, and longevity. While the social and philosophical ramifications of these changes will be profound, and the threats they pose considerable, The Singularity Is Near presents a radical and optimistic view of the coming age that is both a dramatic culmination of centuries of technological ingenuity and a genuinely inspiring vision of our ultimate destiny.
