Download or read book Fast and Efficient Algorithm for Near Field Analysis of Conformal Antenna Arrays written by Punit S. Verma and published by . This book was released on 2002 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Near field Error Analysis and Efficient Sampling Techniques for the Fast Irregular Antenna Field Transformation Algorithm written by Muhammad Ayyaz Qureshi and published by . This book was released on 2013 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Fast Near to Far field Transform Algorithm written by Matthew B. Stephanson and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: A frequent problem in computational electromagnetics is to calculate the electromagnetic field far from a radiating object. This has numerous applications, such as antenna analysis and determining the radar cross sections of airplanes, ships, etc. Another application to converting near field measurements, taken in an indoor measurement range for instance, and transforming them to the far-zone. However, when the field of a large object needs to be calculated in many directions, however, this computation can take too long to be practical. The goal of this project is to develop an algorithm to greatly speed up this calculation by using a divide-and-conquer approach. First, the necessary background information in electromagnetics and numerical methods is presented. Then, a near to far field transform with potential for O(N^1.5) time complexity is discussed, where N is the number of basis elements used to approximate the object's surface. Finally, the running time and accuracy of the algorithm is discussed, with comparisons to another near to far field computer program for two problem geometries, a VFY-218 airplane with N = 53,054 and an antenna array with N = 106,792. The results show the fast near to far transform can be 30 times faster with an RMS relative error of 2.05e-5, compared to traditional methods.
Download or read book Conformal Antenna Arrays Study written by Wolfgang H. Kummer and published by . This book was released on 1973 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two methods of synthesizing patterns from conical arrays were investigated during this period. In the first method the equivalence principle was used to synthesize patterns that are approximate duplicates of the patterns of representative planar arrays. This is done by evaluating on the surface of the cone the near field of a centrally located and mechanically steered hypothetical planar array. These near fields are used to calculate the required complex excitations of real elements on the surface of the cone to nearly duplicate the pattern of the hypothetical planar array. Patterns are presented of the results for two beam pointing directions. In the second method of synthesizing patterns from a conical surface, a heuristic approach was taken wherein the placement of the elements on the surface was based on extrapolations from linear and circular array theory and practice. Several element configurations are considered and numerous computer patterns are presented. The characteristics of these patterns are summarized by comparing in graphical form grating lobe levels, first sidelobe levels, and back-lobe levels for all of the patterns.
Download or read book Analysis and Optimisation of Array Antennas for Near field Plane Wave Synthesis written by Neil Norman Jackson and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiated electromagnetic compatibility (EMC) testing requires field distributions of uniform intensity throughout a test zone. This field condition is achieved within a plane wave. The use of the reflector-fed compact range for generating plane waves is well established for antenna measurements in the microwave frequency region. Extension of this technique into the sub-microwave range poses problems and this work investigates the applicability of antenna arrays for such tests. The basic problem is to determine suitable array element excitations in order to generate an approximate plane wave in the antenna near-field. Some general numerical synthesis techniques are described and shown to be applicable to arrays of arbitrary element composition and geometry. For concept verification, a prototype array of log-periodic dipole antennas was constructed and its performance accurately predicted using a computer model. Factors affecting the plane wave quality are discussed and adequate performance for some types of antenna measurements as well as for EMC testing is illustrated. One important factor influencing the plane wave quality is the geometrical arrangement of the array elements. A novel procedure for optimising the array element locations using a genetic algorithm is presented. Practical array design issues are addressed and the development of a computer-controlled wide-band feed network is presented. As an exercise in application of the array-illuminated compact range, its use to irradiate a sphere simulating the human head is discussed. Measurements of the field distribution were used to validate a finite-difference time-domain computer model of the system.
Download or read book Design Simulation and Experimental Testing of Near Field Null Formation in K Band Conformal Waveguide Antenna Arrays written by Mohammed Shoab Siddiqui and published by . This book was released on 2004 with total page 206 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 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conformal Array Antenna Theory and Design written by Lars Josefsson and published by John Wiley & Sons. This book was released on 2006-02-10 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first comprehensive treatment of conformal antenna arrays from an engineering perspective. While providing a thorough foundation in theory, the authors of this publication provide a wealth of hands-on instruction for practical analysis and design of conformal antenna arrays. Thus, you get the knowledge you need, alongside the practical know-how to design antennas that are integrated into such structures aircrafts or skyscrapers.
Download or read book Advances in Array Optimization written by Ertugrul Aksoy and published by BoD – Books on Demand. This book was released on 2020-03-04 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need to develop technology and communication necessitates the design of flexible and high-capacity radiating systems in today's communication infrastructure. In this context, antenna arrays are the ideal solution and have been one of the priority research subjects of the science community dealing with electromagnetics from past to present. Optimization of an array may be performed in various ways such as the optimization of excitation, reflector structure, feed network, etc. depending on the array structure. This book is a collection of seven research studies focused on the optimization of array structures in classical phased array or time modulation, including radiator, reflector, feed network, and radiating element optimizations.
Download or read book 60GHz Technology for Gbps WLAN and WPAN written by Su-Khiong Yong and published by John Wiley & Sons. This book was released on 2011-08-02 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses 60 GHz technology for Gbps WLAN and WPAN from theory to practice, covering key aspects for successful deployment. In this book, the authors focus specifically on 60 GHz wireless technology which has emerged as the most promising candidate for multi-gigabit wireless indoor communication systems. 60 GHz technology offers various advantages over current or existing communications systems (e.g. huge unlicensed bandwidth worldwide, high transmit power, high frequency reuse and small form factor), which enables many disruptive applications that are otherwise difficult if not impossible to be realized at lower frequencies. The book addresses all aspects of the state-of-the-art in 60 GHz technology for high data rate wireless applications. Key Features: Comprehensive coverage from theory to practice: provides readers with a thorough technical guide of 60 GHz technology development Brings together the entire area of 60GHz technology for Gigabits per second (Gbps) WLAN and WPAN applications. Discusses practical system designs covering wide aspects such as antenna propagation, beamforming, circuit design, digital communication, signal processing, system architectures, etc. Provides up-to-date standardization activities, regulatory issues, technology development as well as future trends Includes examples and case studies for practical scenarios Contains theoretical, simulation and experimental results to demonstrate and compare the performance of various schemes (or systems) This book serves as an excellent reference for system engineers, system architects, IC designers, standard engineers, researchers, and vendor and manufacturer consumers. Technical consultants, software and application developers will also find this book of interest.
Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 1860 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modern Antenna Design written by Thomas A. Milligan and published by John Wiley & Sons. This book was released on 2005-07-11 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: A practical book written for engineers who design and use antennas The author has many years of hands on experience designing antennas that were used in such applications as the Venus and Mars missions of NASA The book covers all important topics of modern antenna design for communications Numerical methods will be included but only as much as are needed for practical applications
Download or read book Microstrip Patch Antennas A Designer s Guide written by Rod Waterhouse and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: This useful tool provides the reader with a current overview of where microstrip patch antenna technology is at, and useful information on how to design this form of radiator for their given application and scenario. Practical design cases are provided for each goal.
Download or read book Characteristic Modes written by Yikai Chen and published by John Wiley & Sons. This book was released on 2015-06-15 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes how to systematically implement various characteristic mode (CM) theories into designs of practical antenna systems This book examines both theoretical developments of characteristic modes (CMs) and practical developments of CM-based methodologies for a variety of critical antenna designs. The book is divided into six chapters. Chapter 1 provides an introduction and discusses the recent advances of the CM theory and its applications in antenna engineering. Chapter 2 describes the formulation of the characteristic mode theory for perfectly electrically conducting (PEC) bodies and discusses its numerical implementations. Chapter 3 presents the CM theory for PEC structures embedded in multilayered medium and its applications. Chapter 4 covers recent advances in CM theory for dielectric bodies and also their applications. Chapter 5 discusses the CM theory for N-port networks and its applications to the design of antenna arrays. Finally, Chapter 6 discusses the design of platform-integrated antenna systems using characteristic modes. This book features the following: Introduces characteristic mode theories for various electromagnetic structures including PEC bodies, structures in multilayered medium, dielectric bodies, and N-port networks Examines CM applications in electrically small antennas, microstrip patch antennas, dielectric resonator antennas, multiport antennas, antenna arrays, and platform mounted antenna systems Discusses numerical algorithms for the implementation of the characteristic mode theories in computer code Characteristic Modes: Theory and Applications in Antenna Engineering will help antenna researchers, engineers, and students find new solutions for their antenna design challenges.
Download or read book Aperture Antennas for Millimeter and Sub Millimeter Wave Applications written by Artem Boriskin and published by Springer. This book was released on 2017-09-05 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the technology of millimetre waves and Terahertz (THz) antennas. It highlights the importance of moderate and high-gain aperture antennas as key devices for establishing point-to-point and point-to-multipoint radio links for far-field and near-field applications, such as high data-rate communications, intelligent transport, security imaging, exploration and surveillance systems. The book provides a comprehensive overview of the key antenna technologies developed for the mm wave and THz domains, including established ones – such as integrated lens antennas, advanced 2D and 3D horn antennas, transmit and reflect arrays, and Fabry-Perot antennas – as well as emerging metasurface antennas for near-field and far-field applications. It describes the pros and cons of each antenna technology in comparison with other available solutions, a discussion supplemented by practical examples illustrating the step-by-step implementation procedures for each antenna type. The measurement techniques available at these frequency ranges are also presented to close the loop of the antenna development cycle. In closing, the book outlines future trends in various antenna technologies, paving the way for further developments. Presenting content originating from the five-year ESF research networking program ‘Newfocus’ and co-authored by the most active and highly cited research groups in the domain of mm- and sub-mm-wave antenna technologies, the book offers a valuable guide for researchers and engineers in both industry and academia.
Download or read book Antennas written by Yi Huang and published by John Wiley & Sons. This book was released on 2008-09-15 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Practical, concise and complete reference for the basics of modern antenna design Antennas: from Theory to Practice discusses the basics of modern antenna design and theory. Developed specifically for engineers and designers who work with radio communications, radar and RF engineering, this book offers practical and hands-on treatment of antenna theory and techniques, and provides its readers the skills to analyse, design and measure various antennas. Key features: Provides thorough coverage on the basics of transmission lines, radio waves and propagation, and antenna analysis and design Discusses industrial standard design software tools, and antenna measurement equipment, facilities and techniques Covers electrically small antennas, mobile antennas, UWB antennas and new materials for antennas Also discusses reconfigurable antennas, RFID antennas, Wide-band and multi-band antennas, radar antennas, and MIMO antennas Design examples of various antennas are provided Written in a practical and concise manner by authors who are experts in antenna design, with experience from both academia and industry This book will be an invaluable resource for engineers and designers working in RF engineering, radar and radio communications, seeking a comprehensive and practical introduction to the basics of antenna design. The book can also be used as a textbook for advanced students entering a profession in this field.
Download or read book Electromagnetics and Antenna Technology written by Alan J. Fenn and published by Artech House. This book was released on 2017-12-31 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a leading expert in the field, this practical new resource presents the fundamentals of electromagnetics and antenna technology. This book covers the design, electromagnetic simulation, fabrication, and measurements for various types of antennas, including impedance matching techniques and beamforming for ultrawideband dipoles, monopoles, loops, vector sensors for direction finding, HF curtain arrays, 3D printed nonplanar patch antenna arrays, waveguides for portable radar, reflector antennas, and other antennas. It explores the essentials of phased array antennas and includes detailed derivations of important field equations, and a detailed formulation of the method of moments. This resource exhibits essential derivations of equations, providing readers with a strong foundation of the underpinnings of electromagnetics and antennas. It includes a complete chapter on the details of antenna and electromagnetic test and measurement. This book explores details on 3D printed non-planar circular patch array antenna technology and the design and analysis of a planar array-fed axisymmetric gregorian reflector. The lumped-element impedance matched antennas are examined and include a look at an analytic impedance matching solution with a parallel LC network. This book provides key insight into many aspects of antenna technology that have broad applications in radar and communications.
