The Optimum Design of Linear Nonuniformly Spaced Arrays PDF Download
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Author: Richard Paul Dooley
Publisher:
ISBN:
Category :
Languages : en
Pages : 192
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Book Description
Author: Richard Paul Dooley
Publisher:
ISBN:
Category :
Languages : en
Pages : 192
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 464
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Author: Donald Dee Duval
Publisher:
ISBN:
Category :
Languages : en
Pages : 192
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Author: Charles J. Drane (Jr.)
Publisher:
ISBN:
Category : Antenna arrays
Languages : en
Pages : 44
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Book Description
This is a theoretical study of certain optimum linear arrays of nonuniformly spaced, isotropic antennas. For this purpose, the beamwidth of any given radiation pattern is defined in a new, integral sense, with low values denoting highly directional radiation patterns with low sidelobes. The present work is almost wholly concerned with the choice of (1) the excitation currents, and (2) the locations of individual antennas to minimize this particular beamwidth. It is shown that the first of these two choices reduces to a straightforward eigenvalue problem involving symmetric matrices. The search for the optimum element locations, however, requires also a knowledge of the derivatives of this 'best' beamwidth with respect to changes in the element spacings, together with some hunting procedure to arrive at configurations for which all those are zero. In the present computations, the latter consisted of a step-by-step procedure wherein the locally optimum beamwidth and its derivatives for any given array were first computed via the matrices, and successive neighboring configurations were then defined automatically with the elements shifted by amounts (of prescribed total magnitude) calculated to reduce the beamwidth as much as possible at every step. Numerical results of these computations are here presented for arrays ranging from four to forty symmetrically placed elements. On the whole, they seem to indicate that the best configurations in cases where the overall aperture is not constrained are ones in which the elements are spaced very nearly uniformly, with separations of the order of 0.8 to 0.9 times the wavelength. (Author).
Author:
Publisher: Allied Publishers
ISBN: 9788177641004
Category : Computer networks
Languages : en
Pages : 444
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Author: International Association of Science and Technology for Development
Publisher: Anaheim [Calif.] ; Calgary : ACTA Press
ISBN:
Category : Computers
Languages : en
Pages : 608
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Book Description
Author: Nicholas Fourikis
Publisher: Elsevier
ISBN: 0080498701
Category : Technology & Engineering
Languages : en
Pages : 389
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Book Description
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. 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]
Author: Robert C. Hansen
Publisher: John Wiley & Sons
ISBN: 0470529172
Category : Technology & Engineering
Languages : en
Pages : 571
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Book Description
An in-depth treatment of array phenomena and all aspects of phased array analysis and design Phased Array Antennas, Second Edition is a comprehensive reference on the vastly evolving field of array antennas. The Second Edition continues to provide an in-depth evaluation of array phenomena with a new emphasis on developments that have occurred in the field over the past decade. The book offers the same detailed coverage of all practical and theoretical aspects of phased arrays as the first edition, but it now includes: New chapters on array-fed reflector antennas; connected arrays; and reflect arrays and retrodirective arrays Brand-new coverage of artificial magnetic conductors, and Bode matching limitations A clear explanation of the common misunderstanding of scan element pattern measurement, along with appropriate equations In-depth coverage of finite array Gibbsian models, photonic feeding and time delay, waveguide simulators, and beam orthogonality The book is complemented with a multitude of original curves and tables that illustrate how particular behaviors were derived from the author's hundreds of programs developed over the past forty years. Additionally, numerous computer design algorithms and numerical tips are included throughout the book to help aid in readers' comprehension. Phased Array Antennas, Second Edition is an ideal resource for antenna design engineers, radar engineers, PCS engineers, and communications engineers, or any professional who works to develop radar and telecommunications systems. It also serves as a valuable textbook for courses in phased array design and theory at the upper-undergraduate and graduate levels.
Author: Harvey K. Schuman
Publisher:
ISBN:
Category : Antenna arrays
Languages : en
Pages : 156
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Book Description
Analytical techniques presented thus far for treatment of unequally spaced antenna arrays have pointed out that desirable radiation characteristics can be achieved using only the interelement spacings as design parameters. The advantage is that the excitation amplitudes required can be either uniform or nearly uniform across the array, thereby allowing use of a simple feed system for excitation of the array elements and minimizing adverse mutual coupling effects. The design methods have found only limited applications, however, since results are not always reliable due to the approximations necessary to simplify the analytical work. Various computational methods have been presented to circumvent this problem, but these in turn suffer disadvantage in that they provide no control over the ultimate positions of the array elements, giving rise to unrealistic spacing configurations and severe realization problems through mutual coupling. In this work a new computational technique is presented for designing unequally spaced arrays. The method is particularly suitable for use with modern high-speed electronic computers, and allows certain practical restrictions or constraints to be included in the design procedure by allowing use of a limited number of different excitation amplitude levels. The result in any given example is an unequally spaced linear array designed for a specified sidelobe level, with a number of amplitude levels appropriate for insuring that prespecified spacing restrictions are met. Thus, the practical difficulties encountered with the results of other computational schemes are largely avoided. Several examples are given, and both theoretical and experimental results are included. (Author).
Author: Satchidananda Dehuri
Publisher: Springer Nature
ISBN: 9811687390
Category : Technology & Engineering
Languages : en
Pages : 718
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Book Description
This book includes best-selected, high-quality research papers presented at Second International Conference on Biologically Inspired Techniques in Many Criteria Decision Making (BITMDM 2021) organized by Department of Information & Communication Technology, Fakir Mohan University, Balasore, Odisha, India, during December 20-21, 2021. This proceeding presents the recent advances in techniques which are biologically inspired and their usage in the field of many criteria decision making. The topics covered are biologically inspired algorithms, nature-inspired algorithms, multi-criteria optimization, multi-criteria decision making, data mining, big-data analysis, cloud computing, IOT, machine learning and soft computing, smart technologies, crypt-analysis, cognitive informatics, computational intelligence, artificial intelligence and machine learning, data management exploration and mining, computational intelligence, and signal and image processing.
