Phased Array Antenna Pattern Optimization with Failed Elements PDF Download
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Author: B. F Collins (II.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
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Book Description
This paper discusses several methods of optimizing the pattern of a phased array antenna. Two methods, the gradient search algorithm method and the null displacement technique were shown to be applicable to optimizing a phased array with failed elements. The results of the study show how the pattern can be optimized depending on the scalar cost function and constraints chosen and what effects varying the complex weight of the array elements has on the pattern.
Author: B. F Collins (II.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
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Book Description
This paper discusses several methods of optimizing the pattern of a phased array antenna. Two methods, the gradient search algorithm method and the null displacement technique were shown to be applicable to optimizing a phased array with failed elements. The results of the study show how the pattern can be optimized depending on the scalar cost function and constraints chosen and what effects varying the complex weight of the array elements has on the pattern.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 92
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Book Description
Using a phased array antenna on a system can add dimensions of flexibility and control. By varying the phase and amplitude of the current exciting each element, the far field antenna pattern can be modified in such a way as to obtain a desired, optimal pattern. The purpose of this thesis is to develop a rapid compensation method for any element failures by varying the currents exciting the remaining elements. Although many methods for optimizing the pattern of a full array are available, this work is unique because it develops methods of finding the optimum pattern of an array which contains failed or missing elements. Optimization methods in the literature which were investigated include thinned array analysis, adaptive array analysis, eigenvalue methods, null displacement techniques, and assorted iterative techniques. Another method discussed in this thesis, the direct technique, originated from the need for a quick optimization method, especially when very large arrays are used. (Thesis).
Author: Jafar Ramadhan Mohammed
Publisher: BoD – Books on Demand
ISBN: 1789857414
Category : Technology & Engineering
Languages : en
Pages : 122
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Book Description
Array pattern optimization is a very important and necessary issue in the majority of modern communication systems in a variety of applications such as sonar, radar, navigation, wireless communications, and many other engineering fields. Classical methods for array pattern synthesis have worked mainly with analytical models that are linear, local and, thus, their performances were not optimum. They have always been designed with closed-form mathematical models. Unlike these analytical methods, the global optimization methods with powerful computing tools offer optimum solutions. During the last few years, the design of the antenna arrays has been a topic of significant research activity. This book presents recent advances in the field of array pattern optimization. It is targeted primarily toward students and researchers who want to be exposed to a wide variety of antenna array design and optimization. It includes five chapters as well as the introductory chapter. These five chapters are categorized into five different areas depending on the application. These applications are ordered to address interference suppression, electronic toll collection, mmWave and ultra-wideband, integrated antennas, and educational packages for modeling smart antenna for 5G wireless communications. The book has the advantage of providing a collection of applications that are entirely independent and self-contained; thus, the interested reader can choose any chapter and skip to another without losing continuity.
Author: Sergei P. Skobelev
Publisher: Artech House
ISBN: 160807191X
Category : Technology & Engineering
Languages : en
Pages : 285
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Book Description
This authoritative resource provides you with a detailed description of ideal array element characteristics that help you estimate the quality of development of real-world phased array antennas. You find several approaches to optimum phased array design, allowing you to provide specified array gain in a specific region of scan, using a minimum number of expensive, controlled devices. Moreover, this practical book presents important numerical methods that you can use to model and optimize phased array structure to obtain the best array characteristics that the chosen structure can provide.From arrays with beam-forming networks, arrays of coupled dual-mode waveguides, and arrays with reactively loaded radiators, to waveguide arrays with protruding dielectric elements, and arrays with strip, disk, and wire structures, this comprehensive reference explains a wide range of essential topics to help you with work in this challenging area. The book is supported with over 165 illustrations and more than 566 equations.
Author: Bernard F. Collins (CAPT, USAF., II)
Publisher:
ISBN:
Category : Antenna arrays
Languages : en
Pages :
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Book Description
Author: Slawomir Koziel
Publisher: World Scientific
ISBN: 1786346001
Category : Technology & Engineering
Languages : en
Pages : 494
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Book Description
The book addresses surrogate-assisted design of antenna arrays, in particular, how surrogate models, both data-driven and physics-based, can be utilized to expedite procedures such as parametric optimization, design closure, statistical analysis, or fault detection. Algorithms and design frameworks are illustrated using a large variety of examples including real-world printed-circuit antenna and antenna array structures.This unique compendium contains introductory materials concerning numerical optimization, both conventional (gradient-based and derivative-free, including metaheuristics) and surrogate-based, as well as a considerable selection of customized procedures developed specifically to handle antenna array problems. Recommendations concerning practical aspects of surrogate-assisted multi-objective antenna optimization are also given. The methods presented allow for cost-efficient handling of antenna array design problems (involving CPU-intensive EM models) in the context of design optimization and statistical analysis, which will benefit both researchers, designers and graduate students.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Nasir Ammar
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659745423
Category :
Languages : en
Pages : 56
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Book Description
Distorted beam pattern in array antenna is due to failure of one are more elements in array. Correction in beam pattern is done either through readjusting the weights of remaining healthy array elements or by readjusting phase. Readjusting phase put restriction beam steering which is unacceptable. We can easily correct faulty array pattern without paying much cost by readjustment of weights by different optimization techniques. In this work a new optimization hybrid technique based on firefly & harmony search algorithm in LAA. This optimization algorithm has provided fast and more accurate result in correction as compare to individual firefly and harmony search. This hybrid algorithm has a firefly algorithm feature of finding local maxima in less time and then finding optimum solution from these local maxima by using harmony search algorithm. It is fast enough to be implemented practically. I am proposing to use this hybrid algorithm in 2-diminsional LAA (circular or rectangular) or other type of array antennas. I am also proposing to check this algorithm in more than one faulty element in Linear Antenna Array.
Author: Robert J. Mailloux
Publisher: Artech House
ISBN: 163081508X
Category : Technology & Engineering
Languages : en
Pages : 506
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Book Description
This completely revised third edition of an Artech House classic, Phased Array Antenna Handbook, Second Edition, offers an up-to-date and comprehensive treatment of array antennas and systems. This edition provides a wealth of new material, including expanded coverage of phased array and multiple beam antennas. New modern machine learning techniques used for analysis are included. Additional material on wideband antennas and wideband coverage in array antennas are incorporated in this book, including new methods, devices, and technologies that have developed since the second edition. A detailed treatment of antenna system noise, sections on antenna pattern synthesis, developments in subarray technology, and in-depth coverage of array architecture and components are additional new features of this book. The book explores design elements that demonstrate how to size an array system with speed and confidence. Moreover, this resource provides expanded coverage of systems aspects of arrays for radar and communications. Supported with numerous equations and illustrations, this practical book helps evaluate basic antenna parameters such as gain, sidelobe levels, and noise. Readers learn how to compute antenna system noise, design subarray geometries for given bandwidth, scan and sidelobe constraints, and choose array illumination tapers for given sidelobe levels.
Author: Ahmed H. Abdelrahman
Publisher: Springer Nature
ISBN: 303101541X
Category : Technology & Engineering
Languages : en
Pages : 151
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Book Description
In recent years, transmitarray antennas have attracted growing interest with many antenna researchers. Transmitarrays combines both optical and antenna array theory, leading to a low profile design with high gain, high radiation efficiency, and versatile radiation performance for many wireless communication systems. In this book, comprehensive analysis, new methodologies, and novel designs of transmitarray antennas are presented. Detailed analysis for the design of planar space-fed array antennas is presented. The basics of aperture field distribution and the analysis of the array elements are described. The radiation performances (directivity and gain) are discussed using array theory approach, and the impacts of element phase errors are demonstrated. The performance of transmitarray design using multilayer frequency selective surfaces (M-FSS) approach is carefully studied, and the transmission phase limit which are generally independent from the selection of a specific element shape is revealed. The maximum transmission phase range is determined based on the number of layers, substrate permittivity, and the separations between layers. In order to reduce the transmitarray design complexity and cost, three different methods have been investigated. As a result, one design is performed using quad-layer cross-slot elements with no dielectric material and another using triple-layer spiral dipole elements. Both designs were fabricated and tested at X-Band for deep space communications. Furthermore, the radiation pattern characteristics were studied under different feed polarization conditions and oblique angles of incident field from the feed. New design methodologies are proposed to improve the bandwidth of transmitarray antennas through the control of the transmission phase range of the elements. These design techniques are validated through the fabrication and testing of two quad-layer transmitarray antennas at Ku-band. A single-feed quad-beam transmitarray antenna with 50 degrees elevation separation between the beams is investigated, designed, fabricated, and tested at Ku-band. In summary, various challenges in the analysis and design of transmitarray antennas are addressed in this book. New methodologies to improve the bandwidth of transmitarray antennas have been demonstrated. Several prototypes have been fabricated and tested, demonstrating the desirable features and potential new applications of transmitarray antennas.
