Effects Of Mutual Coupling In Small Dipole Array Antennas

Author : Yeo C. Beng
Publisher : Unknown
Page : 67 pages
File Size : 55,9 Mb
Release : 2002-03-01
Category : Electronic
ISBN : 1423549406

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Effects of Mutual Coupling in Small Dipole Array Antennas by Yeo C. Beng Pdf

In the classical approach of antenna theories, mutual coupling between elements is usually ignored. However, depending on the application, errors due to mutual coupling can be significant. This thesis investigates the effects of mutual coupling between elements in small dipole arrays via software simulations that use the Methods of Moment, a numerical technique that accounts for mutual coupling, as opposed to the classical approach, which does not. The simulations show that the active impedance of any element in an array depends on both the self and mutual impedances and that the terminal current phases, hence directivity, of an array are affected by mutual coupling such that the array pattern deviates from that defined by classical theoretical approach. In an active element pattern approach, the mutual couplings in an array are accounted for through the active element, making this approach a viable one to study the radiation patterns of practical dipole arrays. The examination of a small array provides a useful environment in which to develop, optimize and evaluate the radiating elements, thus providing better understanding of the effects of mutual coupling in antenna arrays and facilitating the design of corresponding compensation techniques in practical arrays.

Author : Chua E. Hock
Publisher : Unknown
Page : 143 pages
File Size : 52,5 Mb
Release : 2003-03-01
Category : Electronic
ISBN : 1423512960

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Reduction of Mutual Coupling in Small Dipole Array Antennas by Chua E. Hock Pdf

The mutual coupling in phased array is a well-known phenomenon. It affects the active element pattern of the array as the phase of the individual element is altered. In an array that has many elements, the effect is identical for all the elements that are nearer to the center of the antenna, thus allowing a more predictable scan performance with respect to the phase of the elements. However, in a small array that has only three elements, the active element pattern for the elements at the end can be significantly different from the center element and this affects the predictability of operations such as direction finding. The thesis investigates two ways that can potentially reduce or at least control the mutual coupling in small arrays. The first method simply adds a dummy element with a special load condition to each end of the array to make the edge element "feel" as if there are more elements next to it. The second method uses a passive feedback circuit to both monitor and correct the magnitude and phase of the mutual coupling at the input of each array element. A hybrid ring is attached to each of the elements to monitor the amount of interference received by that element. Simulation results for the dummy element method shows that some reduction in phase error can be achieved if the spacing and length of the element are selected properly. The compensation network approach relies on an efficient two-port array element. The research has focused on the design of a two-port printed circuit dipole that could be used in such an array. The dipole was designed, simulated, and fabricated. Future research will use this element in a compensation network.

Author : Trevor S. Bird
Publisher : John Wiley & Sons
Page : 484 pages
File Size : 50,5 Mb
Release : 2021-06-28
Category : Technology & Engineering
ISBN : 9781119564980

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Mutual Coupling Between Antennas by Trevor S. Bird Pdf

Mutual Coupling Between Antennas A guide to mutual coupling between various types of antennas in arrays such as wires, apertures and microstrip patches or antennas co-sited on platforms Mutual Coupling Between Antennas explores the theoretical underpinnings of mutual coupling, offers an up-to-date description of the physical effects of mutual coupling for a variety of antennas, and contains techniques for analysing and assessing its effects. The book puts the topic in historical context, presents an integral equation approach, includes the current techniques, measurement methods, and discusses the most recent advances in the field. With contributions from noted experts on the topic, the book reviews practical aspects of mutual coupling and examines applications that clearly demonstrate where the performance is impacted both positively and negatively. Mutual Coupling Between Antennas contains information on how mutual coupling can be analysed with a wide range of methods from direct computer software using discrete methods, to integral equations and Greens function methods as well as approximate asymptotic methods. This important text: Provides a theoretical background for understanding mutual coupling between various types of antennas Describes the interaction that occurs between antennas, both planned and unplanned Explores a key aspect of arrays in any wireless, radar or sensing system operating at radio frequencies Offers a groundbreaking book on antenna mutual coupling Written for antenna engineers, technical specialists, researchers and students, Mutual Coupling Between Antennas is the first book to examine mutual coupling between various types of antennas including wires, horns, microstrip patches, MIMO antennas, co-sited antennas and arrays in planar or conformal configurations.

Author : Chee H. Ong
Publisher : Unknown
Page : 119 pages
File Size : 40,7 Mb
Release : 2003-12-01
Category : Electronic
ISBN : 1423514033

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Modeling of the Ring-Hybrid Dipole Antenna and Mutual Coupling in a Small Antenna Array by Chee H. Ong Pdf

This thesis project modeled a microstrip ring-hybrid dipole that is capable of simultaneously producing a sum pattern and difference pattern using the method of moments (MoM) based on the Rao-Wilton-Glisson (RWG) edge elements. The ring- hybrid dipole is simply a ring-hybrid coupler driving a dipole antenna. A two-feed point dipole model was developed and its antenna parameters were found to be a good representation of the ring-hybrid dipole actual values. In the feed network modeling, the matrix solution combined the MoM equations on the antenna surfaces and a magic-tee scattering matrix by applying Kirchhoff's voltage and current laws at the terminals of the antenna, Once the excitation is specified, the complete system of equations was solved to yield the MoM current expansion coefficients and the signals in the feed network. The effect of mutual coupling in an array of three ring-hybrid dipoles was examined by extending the model, In the receive mode, the direction and polarization of the incidence plane wave were varied, The phases for both the sum port and difference port outputs were observed to change smoothly, except during situations of cross polarization and zero phase difference, The array model will ton% the foundation for the design and analysis of a mutual coupling compensation network,

Author : Anonim
Publisher : Allied Publishers
Page : 514 pages
File Size : 49,9 Mb
Release : 1998
Category : Electromagnetic waves
ISBN : 8170237866

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National Symposium on Advances in Microwaves and Lightwaves by Anonim Pdf

Author : Junping Geng,Chaofan Ren,Kun Wang,Erwei Liu,Jing Zhang
Publisher : Springer Nature
Page : 174 pages
File Size : 45,8 Mb
Release : 2022-08-19
Category : Technology & Engineering
ISBN : 9789811935596

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Generalized Principle of Pattern Multiplication and Its Applications by Junping Geng,Chaofan Ren,Kun Wang,Erwei Liu,Jing Zhang Pdf

This book investigates in detail the generalized principle of the pattern multiplication (GPPM) and its application to new phased array with high performances. It introduces the generalized element factor (GEF) to small aperture with multi-modes. Based on the GEF, the GPPM can be used to construct the wide-angle scanning array with the dual-port phase mode antenna. Further, a dual-port phase mode SSPPs antenna is proposed to scan in 3D free space. It is extended to two kinds of 1D arrays with 4 elements; both of them perform good 3D scanning with high gain and large range, which will improve future radar design and wireless communication. This book proposes a new method to develop the potentialities of the GPPM and the new phase array. And the readers can study the method or ideas of the GEF, GPPM, even graft the methods to new phase mode antenna and array. It is intended for undergraduate and graduate students who are interested in new phase mode antenna and array technology, researchers investigating high-performance antenna, and antenna design engineers working on phase array applications.

Author : Robert J. Mailloux
Publisher : Morgan & Claypool Publishers
Page : 93 pages
File Size : 50,6 Mb
Release : 2007
Category : Antenna arrays
ISBN : 9781598291827

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Electronically Scanned Arrays by Robert J. Mailloux Pdf

Provides a compact but comprehensive treatment of the scanned array, from the underlying basis for array pattern behaviour to the engineering choices leading to successful design. The book describes the scanned array in terms of radiation from apertures and wire antennas and introduces the effects resulting directly from scanning.

Author : Trevor S. Bird
Publisher : John Wiley & Sons
Page : 484 pages
File Size : 43,8 Mb
Release : 2021-06-24
Category : Technology & Engineering
ISBN : 9781119564973

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Mutual Coupling Between Antennas by Trevor S. Bird Pdf

Mutual Coupling Between Antennas A guide to mutual coupling between various types of antennas in arrays such as wires, apertures and microstrip patches or antennas co-sited on platforms Mutual Coupling Between Antennas explores the theoretical underpinnings of mutual coupling, offers an up-to-date description of the physical effects of mutual coupling for a variety of antennas, and contains techniques for analysing and assessing its effects. The book puts the topic in historical context, presents an integral equation approach, includes the current techniques, measurement methods, and discusses the most recent advances in the field. With contributions from noted experts on the topic, the book reviews practical aspects of mutual coupling and examines applications that clearly demonstrate where the performance is impacted both positively and negatively. Mutual Coupling Between Antennas contains information on how mutual coupling can be analysed with a wide range of methods from direct computer software using discrete methods, to integral equations and Greens function methods as well as approximate asymptotic methods. This important text: Provides a theoretical background for understanding mutual coupling between various types of antennas Describes the interaction that occurs between antennas, both planned and unplanned Explores a key aspect of arrays in any wireless, radar or sensing system operating at radio frequencies Offers a groundbreaking book on antenna mutual coupling Written for antenna engineers, technical specialists, researchers and students, Mutual Coupling Between Antennas is the first book to examine mutual coupling between various types of antennas including wires, horns, microstrip patches, MIMO antennas, co-sited antennas and arrays in planar or conformal configurations.

Author : Hema Singh,Mausumi Dutta,P. S. Neethu
Publisher : Springer
Page : 43 pages
File Size : 53,5 Mb
Release : 2016-08-23
Category : Technology & Engineering
ISBN : 9789811022722

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Probe Suppression in Conformal Phased Array by Hema Singh,Mausumi Dutta,P. S. Neethu Pdf

This book considers a cylindrical phased array with microstrip patch antenna elements and half-wavelength dipole antenna elements. The effect of platform and mutual coupling effect is included in the analysis. The non-planar geometry is tackled by using Euler's transformation towards the calculation of array manifold. Results are presented for both conducting and dielectric cylinder. The optimal weights obtained are used to generate adapted pattern according to a given signal scenario. It is shown that array along with adaptive algorithm is able to cater to an arbitrary signal environment even when the platform effect and mutual coupling is taken into account. This book provides a step-by-step approach for analyzing the probe suppression in non-planar geometry. Its detailed illustrations and analysis will be a useful text for graduate and research students, scientists and engineers working in the area of phased arrays, low-observables and stealth technology.

Author : Jiaguo Lu,Wei Wang,Xiaolu Wang,Yongxin Guo
Publisher : Springer Nature
Page : 455 pages
File Size : 54,8 Mb
Release : 2023-05-04
Category : Technology & Engineering
ISBN : 9789819914753

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Active Array Antennas for High Resolution Microwave Imaging Radar by Jiaguo Lu,Wei Wang,Xiaolu Wang,Yongxin Guo Pdf

This book highlights the application of active array antennas in high-resolution microwave imaging radar systems. It introduces the basic principles, analytical methods, and performance parameters of active array antennas to achieve low profile, high efficiency, and lightweight. The book systematically elaborates the architecture, analysis, and engineering practice to achieve wideband, multi-band, multi-polarization, and common aperture in active array antennas. It explores hotspot technologies of digital array antennas, microwave photonic array antennas, and active packaging antennas. By presenting over 300 illustrations and diagrams, including schematic diagrams, block diagrams, relation diagrams, and breakdown drawings, the book enables a thorough understanding of the antenna array microsystem as the advanced phase of active array antennas and the direction of future R&D. The book is a good reference source for researchers and engineers interested in the engineering and implementation of microwave imaging radar systems and antenna technology.

Author : Constantine A. Balanis,Panayiotis I. Ioannides
Publisher : Springer Nature
Page : 175 pages
File Size : 51,5 Mb
Release : 2022-06-01
Category : Technology & Engineering
ISBN : 9783031015335

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Introduction to Smart Antennas by Constantine A. Balanis,Panayiotis I. Ioannides Pdf

As the growing demand for mobile communications is constantly increasing, the need for better coverage, improved capacity, and higher transmission quality rises. Thus, a more efficient use of the radio spectrum is required. Smart antenna systems are capable of efficiently utilizing the radio spectrum and is a promise for an effective solution to the present wireless systems’ problems while achieving reliable and robust high-speed high-data-rate transmission. The purpose of this book is to provide the reader a broad view of the system aspects of smart antennas. In fact, smart antenna systems comprise several critical areas such as individual antenna array design, signal processing algorithms, space-time processing, wireless channel modeling and coding, and network performance. In this book we include an overview of smart antenna concepts, introduce some of the areas that impact smart antennas, and examine the influence of interaction and integration of these areas to Mobile Ad-Hoc Networks. In addition, the general principles and major benefits of using space-time processing are introduced, especially employing multiple-input multiple-output (MIMO) techniques.

Author : Robert C. Hansen
Publisher : John Wiley & Sons
Page : 571 pages
File Size : 50,7 Mb
Release : 2009-11-19
Category : Technology & Engineering
ISBN : 9780470529171

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Phased Array Antennas by Robert C. Hansen Pdf

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 : Robert J. Mailloux
Publisher : Springer Nature
Page : 81 pages
File Size : 50,6 Mb
Release : 2022-06-01
Category : Technology & Engineering
ISBN : 9783031015342

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Electronically Scanned Arrays by Robert J. Mailloux Pdf

Scanning arrays present the radar or communications engineer with the ultimate in antenna flexibility. They also present a multitude of new opportunities and new challenges that need to be addressed. In order to describe the needs for scanned array development, this book begins with a brief discussion of the history that led to present array antennas. This text is a compact but comprehensive treatment of the scanned array, from the underlying basis for array pattern behavior to the engineering choices leading to successful design. The book describes the scanned array in terms of radiation from apertures and wire antennas and introduces the effects resulting directly from scanning, including beam broadening, impedance mismatch and gain reduction and pattern squint and those effects of array periodicity including grating and quantization lobes and array blindness. The text also presents the engineering tools for improving pattern control and array efficiency including lattice selection, subarrray technology and pattern synthesis. Equations and figurers quantify the phenomena being described and provide the reader with the tools to tradeoff various performance features. The discussions proceed beyond the introductory material and to the state of the art in modern array design. Contents: Basic Principles and Applications of Array Antennas / Element Coupling Effects in Array Antennas / Array Pattern Synthesis / Subarray Techniques for Limited Field of View and Wide Band Applications

Author : Leo G. Maloratsky
Publisher : Artech House
Page : 381 pages
File Size : 50,5 Mb
Release : 2012
Category : Technology & Engineering
ISBN : 9781608072064

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Integrated Microwave Front-ends with Avionics Applications by Leo G. Maloratsky Pdf

This highly practical resource offers you an in-depth understanding of microwave front end integration and how it is applied in the avionics field. You find detailed guidance on circuit integration, including coverage of component miniaturization, hybrid and monolithic integrated circuits, and 3D design. The book addresses system integration with discussions on the combination of different avionic systems, single antenna design, top/bottom front end combination, and integration of passive and active antenna modules. This first-of-its-kind volume features unique material on novel structures of avionics front end, novel transmission lines, elements, and devices, as well as new strategies for microwave front-end design. Supported with nearly 200 illustrations and more than 160 equations, this book is a valuable professional reference and also serves well as a postgraduate textbook.

Author : T. K. Sarkar,Magdalena Salazar-Palma,Eric L. Mokole
Publisher : John Wiley & Sons
Page : 589 pages
File Size : 48,8 Mb
Release : 2008-07-10
Category : Technology & Engineering
ISBN : 9780470289235

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Physics of Multiantenna Systems and Broadband Processing by T. K. Sarkar,Magdalena Salazar-Palma,Eric L. Mokole Pdf

An analysis of the physics of multiantenna systems Multiple-Input Multiple-Output (MIMO) technology is one of the current hot topics in emerging wireless technologies. This book fills the important need for an authoritative reference on the merits of MIMO systems based on physics and provides a sound theoretical basis for its practical implementation. The book also addresses the important issues related to broadband adaptive processing. Written by three internationally known researchers, Physics of Multiantenna Systems and Broadband Processing: Provides a thorough discussion of the physical and mathematical principles involved in MIMO and adaptive systems Examines the electromagnetic framework of wireless communications systems Uses Maxwell's theory to provide a system-based framework for the abstract concept of channel capacity Performs various numerical simulations to observe how a typical system will behave in practice Provides a mathematical formulation for broadband adaptive processing and direction-of-arrival estimation using real antenna arrays Integrates signal processing and electromagnetics to address the performance of realistic multiantenna systems With Physics of Multiantenna Systems and Broadband Processing, communication systems engineers, graduate students, researchers, and developers will gain a thorough, scientific understanding of this important new technology.