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Author: Tayeb A. Denidni
Publisher: Artech House
ISBN: 1608077152
Category : Technology & Engineering
Languages : en
Pages : 211
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Book Description
This book presents ultrawideband antennas and their applications on microwave imaging. The chapters focus on recent techniques, analysis, and applications along with the future vision of this emerging field of applied electromagnetics. Several emerging topics are essayed, including dielectric resonator antennas and planar ultrawideband antennas for microwave imaging. This resource incorporates modern design concepts, analysis, and optimization techniques based on recent developments. Readers are also provided with an extensive overview of current regulations, including those related to microwave effects in biological tissues.
Author: Tayeb A. Denidni
Publisher: Artech House
ISBN: 1608077152
Category : Technology & Engineering
Languages : en
Pages : 211
Get Book Here
Book Description
This book presents ultrawideband antennas and their applications on microwave imaging. The chapters focus on recent techniques, analysis, and applications along with the future vision of this emerging field of applied electromagnetics. Several emerging topics are essayed, including dielectric resonator antennas and planar ultrawideband antennas for microwave imaging. This resource incorporates modern design concepts, analysis, and optimization techniques based on recent developments. Readers are also provided with an extensive overview of current regulations, including those related to microwave effects in biological tissues.
Author: IBRAHIM ASYADH (TP016450)
Publisher:
ISBN:
Category : Imaging systems
Languages : en
Pages : 72
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Book Description
Author: Jalilvand, Malyhe
Publisher: KIT Scientific Publishing
ISBN: 3731506645
Category : Technology (General)
Languages : en
Pages : 182
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Book Description
The goal of this work is the introduction of efficient antenna structures on the basis of the requirement of different microwave imaging methods; i.e. quantitative and qualitative microwave imaging techniques. Several criteria are proposed for the evaluation of single element antenna structures for application in microwave imaging systems. The performance of the proposed antennas are evaluated in simulation and measurement scenarios.
Author: Ben Allen
Publisher: John Wiley & Sons
ISBN: 0470056827
Category : Technology & Engineering
Languages : en
Pages : 508
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Book Description
Providing up-to-date material for UWB antennas and propagation as used in a wide variety of applications, "Ultra-wideband Antennas and Propagation for Communications, Radar and Imaging" includes fundamental theory, practical design information and extensive discussion of UWB applications from biomedical imaging, through to radar and wireless communications. An in-depth treatment of ultra-wideband signals in practical environments is given, including interference, coexistence and diversity considerations. The text includes antennas and propagation in biological media in addition to more conventional environments. The topics covered are approached with the aim of helping practising engineers to view the subject from a different angle, and to consider items as variables that were treated as constants in narrowband and wideband systems. Features tables of propagation data, photographs of antenna systems and graphs of results (e.g. radiation patterns, propagation characteristics) Covers the fundamentals of antennas and propagation, as well as offering an in-depth treatment of antenna elements and arrays for UWB systems, and UWB propagation models Provides a description of the underlying concepts for the design of antennas and arrays for conventional as well as ultra-wideband systems Draws together UWB theory by using case-studies to show applications of antennas and propagation in communication, radar and imaging systems The book highlights the unique design issues of using ultra-wideband and will serve both as an introductory text and a reference guide for designers and students alike.
Author: Seungwoo Ryu
Publisher:
ISBN:
Category :
Languages : en
Pages : 276
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Book Description
Since the Federal Communication Commission (FCC) allowed the 3.1-10.6GHz unlicensed band for UWB communication, Ultra-wideband (UWB) systems have attracted great attention in the wireless worldwide because of their advantages, including high speed data rate, extremely low spectral density, high precision, low cost, and low complexity. As in the case in conventional wireless communication systems, antennas play a very crucial role in UWB systems. However, there are more challenges in designing a UWB antenna than a narrow band one. UWB antennas should have sufficient impedance bandwidth, and in some cases it is required to have band-notch characteristics to avoid interference with other bands for the communication system. For radar and sensor applications it is required to have constant group delay to achieve better pulse shape for the microwave signal. Here we show several promising UWB antennas to overcome several difficulties. The interference problem of the wireless communication systems is resolved by adding strip(s) to a UWB antenna, which can control not only the rejection frequency as well as the width of the band-notch. The efficiency problem of UWB antennas is resolved by using a Dielectric Resonator as a radiating element, because DRAs provide higher than 98% radiation efficiency. The radiation pattern problem of the monopole UWB antennas is also solved by the characteristics of the DRA, because there are no edge currents as in the printed antennas. Also, the volume characteristic of DRAs provide small size at the expense of the thickness compared with the printed antennas, because the maximum path length in a certain direction can be reduced to the other introduced direction. To solve the radiation pattern problem of the UWB DRA with broadside pattern, we introduce a gap between the DR and the ground plane edge to make balanced the electric field between both sides, and eliminate some disordered field at two spots that affect the radiation patterns. Therefore, we removed the dielectric materials from these spots to shift the resonant frequency of these modes far away from our frequency band of interest and to leave a well structured higher order field distribution. Due to very good characteristics of the UWB DRA with broadside pattern such as the high antenna efficiency, nearly constant gain, consistent radiation pattern, compact size, and very low variation of the group delay, we apply this sensor to the breast tumor detection for proving the performance in a radar sensor application. Our sensor provides very wide half power beamwidth, so that it can scan whole breast even if the location of the sensor is close to or in contact with the breast skin. Also, the compact size of our proposed sensor allows a large number of sensors to be placed around the breast. In addition, the small variation of the point source makes a very compact image of the breast tumor.
Author: Li, Xuyang
Publisher: KIT Scientific Publishing
ISBN: 3731501473
Category : Medical
Languages : en
Pages : 230
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Book Description
In this work, new concepts of body-matched antennas for microwave medical applications were developed, where the antennas are placed directly on or in the human body. Two types of antennas were designed - on-body matched antennas for diagnosis and implantable antennas for data telemetry with the main focus of miniaturization yet maintained a high radiation performance. The applicability of the antennas was verified using a medical imaging system for the detection of hemorrhagic stroke.
Author: Giselle M. Galvan-Tejada
Publisher: CRC Press
ISBN: 148220651X
Category : Technology & Engineering
Languages : en
Pages : 295
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Book Description
Ultra Wideband Antennas: Design, Methodologies, and Performance presents the current state of the art of ultra wideband (UWB) antennas, from theory specific for these radiators to guidelines for the design of omnidirectional and directional UWB antennas. Offering a comprehensive overview of the latest UWB antenna research and development, this book: Discusses the developed theory for UWB antennas in frequency and time domains Delivers a brief exposition of numerical methods for electromagnetics oriented to antennas Describes solid-planar equivalence, which allows flat structures to be implemented instead of volumetric antennas Examines the impedance matching, phase linearity, and radiation patterns as design objectives for omnidirectional and directional antennas Addresses the time domain signal analysis for UWB antennas, from which the distortion phenomenon can be modeled Includes illustrative examples, design equations, CST MICROWAVE STUDIO® simulations, and MATLAB® plot generations Compares the performance of different UWB antennas, supplying useful insight into particular tendencies and unresolved problems Ultra Wideband Antennas: Design, Methodologies, and Performance provides a valuable reference for the scientific community, as UWB antennas have a variety of applications in body area networks, radar, imaging, spectrum monitoring, electronic warfare, wireless sensor networks, and more.
Author: Giselle M. Galvan-Tejada
Publisher: CRC Press
ISBN: 1351831402
Category : Technology & Engineering
Languages : en
Pages : 285
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Book Description
Ultra Wideband Antennas: Design, Methodologies, and Performance presents the current state of the art of ultra wideband (UWB) antennas, from theory specific for these radiators to guidelines for the design of omnidirectional and directional UWB antennas. Offering a comprehensive overview of the latest UWB antenna research and development, this book: Discusses the developed theory for UWB antennas in frequency and time domains Delivers a brief exposition of numerical methods for electromagnetics oriented to antennas Describes solid-planar equivalence, which allows flat structures to be implemented instead of volumetric antennas Examines the impedance matching, phase linearity, and radiation patterns as design objectives for omnidirectional and directional antennas Addresses the time domain signal analysis for UWB antennas, from which the distortion phenomenon can be modeled Includes illustrative examples, design equations, CST MICROWAVE STUDIO® simulations, and MATLAB® plot generations Compares the performance of different UWB antennas, supplying useful insight into particular tendencies and unresolved problems Ultra Wideband Antennas: Design, Methodologies, and Performance provides a valuable reference for the scientific community, as UWB antennas have a variety of applications in body area networks, radar, imaging, spectrum monitoring, electronic warfare, wireless sensor networks, and more.
Author: Mahdi Moosazadeh
Publisher:
ISBN: 9783030055677
Category : Ultra-wideband antennas
Languages : en
Pages : 137
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Book Description
The research described here develops and applies novel, ultra-wideband (UWB) antipodal Vivaldi antennas for high-resolution detection of defects and damages in composite construction materials and structures using their microwave and millimeter wave imaging. The author examines the challenges of applying the UWB microwave technique in that the technique is dependent on the operating frequency used for the specified material under test. In this context, the objectives of this research volume include, but are not limited to, development of a small UWB antenna at frequency range from 5 GHz - 50 GHz for microwave and millimeter wave imaging of wide range of low loss construction materials, design of a small UWB antenna operating for microwave and millimeter wave imaging of low loss and high loss materials for the purpose of detection of surface damages of concrete under low loss materials, and development of a UWB antenna at frequency range from 2 GHz - 27 GHz for microwave imaging of low loss and high loss materials such as concrete structures and layered structures for the purpose of detection of cavities inside concrete. Introduces a novel sketch of antipodal Vivaldi antennas with dielectric lenses; Tests workability of the designed antennas for different specimens of construction materials and structures; Considers capability of the designed antennas to detect different targets inside construction materials and structures. .
Author: Hans G. Schantz
Publisher: Artech House
ISBN: 1608079562
Category : Technology & Engineering
Languages : en
Pages : 591
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Book Description
This comprehensive treatment of ultrawideband (UWB) antennas and time-domain microwave engineering serves as an invaluable practical reference for anyone involved in antenna and RF design work. This authoritative volume enables readers to select the proper UWB antennas for their applications, design and analyze UWB antennas, and integrate these antennas in an RF system. By applying time-domain thinking to problems of practical interest, the reader will not only learn how to build and analyze antennas, but also understand them at the most fundamental level. This second edition is updated and expanded throughout, providing readers with a history of antennas, numerous new problem sets and worked examples, along with new information on plotting time-domain field lines, time-domain reflectometry, matching techniques, and more. This book also addresses system issues like spectral control and antenna efficiency.
