Download or read book Design of a Reconfigurable Dual Frequency Beam Steering Antenna Array Using PIN Diodes written by Javier Rodriguez De Luis and published by . This book was released on 2008 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reconfigurable Antenna Array Using the PIN Diode Switched Printed Square Spiral Element written by Corey M. Stamper and published by . This book was released on 2021 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: A dual-band array of reconfigurable elements is modeled and simulated. The array consists of four single square spiral microstrip antennas that are corporately fed and are used as a unit cell. The single square spiral uses two PIN diodes as switching elements to achieve reconfiguration. The array has four switch states that can operate over four discrete frequencies in the S and C bands. The unit cell radiation pattern is used with the pattern multiplication model to quickly simulate the array pattern of larger arrays. A 3 x 3 array of the unit cells is modeled with only the center element active and designated as the embedded unit cell. The embedded unit cell is used to capture the effects of mutual coupling and to see how significantly the coupling affects the radiation patterns. The effects of mutual coupling are found to be negligible for a 2 x 2 and larger sized arrays.

Download or read book Reconfigurable Antenna Design and Analysis written by Mohammod Ali and published by Artech House. This book was released on 2021-05-31 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This exciting new book focuses on the analysis and design of reconfigurable antennas for modern wireless communications, sensing, and radar. It presents the definitions of basic antenna parameters, an overview of RF switches and explains how to characterize their insertion loss, isolation, and power handling issues. Basic reconfigurable antenna building blocks, such as dipoles, monopoles, patches and slots are described, followed by presentations on frequency reconfigurable antennas, pattern reconfigurable antennas, and basic scanning antenna arrays. Switch biasing in an electromagnetic environment is discussed, as well as simulation strategies of reconfigurable antennas, and MIMO (Multiple Input Multiple Output) reconfigurable antennas. Performance characterization of reconfigurable antennas is also presented. The book provides information for the technical professional to design frequency reconfigurable, pattern reconfigurable, and MIMO antennas all relevant for modern wireless communication systems. Readers learn how to select switching devices, bias them properly, and understand their role in the overall reconfigurable antenna design. The book presents practical experimental implementation issues, including losses due to switches, materials, and EMI (Electromagnetic Interference) and shows how to address those.

Download or read book Reconfigurable Antennas written by Jennifer T. Bernhard and published by Springer Nature. This book was released on 2022-05-31 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: This lecture explores the emerging area of reconfigurable antennas from basic concepts that provide insight into fundamental design approaches to advanced techniques and examples that offer important new capabilities for next-generation applications. Antennas are necessary and critical components of communication and radar systems, but sometimes their inability to adjust to new operating scenarios can limit system performance. Making antennas reconfigurable so that their behavior can adapt with changing system requirements or environmental conditions can ameliorate or eliminate these restrictions and provide additional levels of functionality for any system. For example, reconfigurable antennas on portable wireless devices can help to improve a noisy connection or redirect transmitted power to conserve battery life. In large phased arrays, reconfigurable antennas could be used to provide additional capabilities that may result in wider instantaneous frequency bandwidths, more extensive scan volumes, and radiation patterns with more desirable side lobe distributions. Written for individuals with a range of experience, from those with only limited prior knowledge of antennas to those working in the field today, this lecture provides both theoretical foundations and practical considerations for those who want to learn more about this exciting subject. Contents: Introduction / Definitions of Critical Parameters for Antenna Operation / Linkage Between Frequency Response and Radiation Characteristics: Implications for Reconfigurable Antennas / Methods for Achieving Frequency Response Reconfigurability / Methods for Achieving Polarization Reconfigurability / Methods for Achieving Radiation Pattern Reconfigurability / Methods for Achieving Compound Reconfigurable Antennas / Practical Issues for Implementing Reconfigurable Antennas / Conclusions and Directions for Future work

Download or read book Low cost Smart Antennas written by Qi Luo and published by John Wiley & Sons. This book was released on 2019-03-18 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: An authoritative guide to the latest developments for the design of low-cost smart antennas Traditional smart antenna systems are costly, consume great amounts of power and are bulky size. Low-cost Smart Antennas offers a guide to designing smart antenna systems that are low cost, low power, and compact in size and can be applied to satellite communications, radar and mobile communications. The authors — noted experts on the topic — provide introductions to the fundamental concepts of antennas, array antennas and smart antennas. The book fills a gap in the literature by presenting the design techniques of low-cost radio frequency (RF) smart antennas as well as approaches for implementing the hardware of the antenna and the beamforming network (BFN). A comprehensive and accessible book, Low-cost Smart Antennas not only presents an up-to-date review of the topic but includes illustrative case studies that contain in-depth explorations of the theory and technology of smart antennas. While other resources highlight the software (signal processing algorithms), this book is unique by focusing on the antenna hardware. This important book: Offers an introduction to the most recent developments of the design of low-cost smart antennas and their applications Presents a unique book that puts the focus on antenna hardware Includes a variety of case studies that clearly demonstrate the implementation of current design techniques Introduces both fundamental theories as well as more advanced topics Written for students and researchers and antenna engineers, Low-cost Smart Antennas explores the most recent advances in the field with an emphasis on antenna hardware.

Download or read book Customizable Antenna Array Using Recofigurable Antenna Elements written by Mahmoud Shirazi and published by . This book was released on 2018 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: A shared-aperture reconfigurable dual-polarized slot-ring antenna array switching between different frequency bands is presented for phased array applications. PIN diode switches are incorporated into the slots of the antenna to change the state of the reconfigurable slot-ring antenna array. Each frequency band has its own feeding lines which allows for the use of high-performance narrow-band transmit/receive (T/R) modules instead of Low-performance ultra wideband (UWB) T/R modules. Furthermore, the spacing between the elements in each frequency band is less than half free-space wavelength ([lamda]0) over the frequency band of operation which enables grating-lobe-free beam scanning. This is the first shared-aperture reconfigurable dual-polarized antenna array with separate feeding which is scalable to a larger array with element spacing of less than 0.5[lamda]0 in all frequency bands.

Download or read book Wideband Multiband and Smart Antenna Systems written by Mohammad Abdul Matin and published by Springer Nature. This book was released on 2021-09-21 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides current R&D trends and novel approaches in design and analysis of broadband, multiband, and smart antennas for 5G and B5G mobile and wireless applications, as well as the identification of integration techniques of these antennas in a diverse range of devices. The book presents theoretical and experimental approaches to help the reader in understanding the unique design issues and more advanced research. Moreover, the book includes chapters on the fundamentals of antenna theory. The book is pertinent to professionals and researchers working in the field of antenna engineering; it is written for graduate students, researchers, academics, and industry practitioners who want to improve their understanding in the current research trends in design analysis of broadband, multiband, and smart antennas for wireless applications.

Download or read book Antenna Design Challenges and Future Directions for Modern Transportation Market written by Moh Chuan Tan and published by Springer Nature. This book was released on 2020-10-26 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is focused on wireless infrastructure deployment in modern transportation markets, where the wireless infrastructure co-exists with the existing structure. It details the challenges this deployment may face and explores the mitigation measures to overcome the challenges. The book proposes a smart antenna structure to overcome airspace congestion, which improves the overall wireless performance and deployment cost. With the combination of practical know-how and theoretical estimation, this book provides insight on how the modern smart antenna techniques that support most cutting-edge wireless technology can be adopted into the existing infrastructure whilst minimising the distraction to the existing system. This book is suitable for industrial and academic researchers, practising engineers within the field of smart antennae, and wireless infrastructure designers and developers.

Download or read book Handbook of Metamaterial Derived Frequency Selective Surfaces written by Shiv Narayan and published by Springer Nature. This book was released on 2023-01-02 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a consolidated reference for the applications of frequency selective surfaces (FSS) technology in different sectors such as wireless communications, smart buildings, microwave and medical industries. It covers all aspects of metamaterial FSS technology starting from theoretical simulation, fabrication and measurement all the way to actual hardware implementation. Also included are in-depth discussions on the design methodologies of metamaterial FSS structures and their practical implementation in devices and components. It will be of interest to researchers and engineers working on developing metamaterial-FSS technology.

Download or read book Recent Innovations in Computing written by Pradeep Kumar Singh and published by Springer Nature. This book was released on 2022-04-15 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book features selected papers presented at the 4th International Conference on Recent Innovations in Computing (ICRIC 2021), held on June 8–9, 2021 by Eötvös Loránd University (ELTE), Budapest, Hungary in association with many Universities; WSG Poland, Knowledge University, ERBIL. The book is divided into two volumes, and it includes the latest research in the areas of software engineering, cloud computing, computer networks and Internet technologies, artificial intelligence, information security, database and distributed computing, and digital India.

Download or read book Reconfigurable Active and Passive Planar Antennas for Wireless Communication Systems written by Shiban Kishen Koul and published by Springer Nature. This book was released on 2022-10-14 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents state-of-the-art trends in reconfigurable active and passive planar antennas and their applications in wireless communication systems operating in the frequency band 5-6 GHz. Due to various key features such as multifunction antenna design, compactness, planar nature, and low cost, these technologies are becoming popular for current and future wireless applications. This book discusses different novel antenna designs and their working principles in detail. The modern and future wireless systems require wideband antennas to accommodate various channels in a single band or in separate bands. The carrier aggregation (CA) has been introduced in the modern wireless systems such as LTE-advanced systems and 5G./6G. In CA, a device can use several channels for transmission and reception. The used channels can exist in the same frequency band (intra-band CA) or in distinct bands (inter-band CA). To accommodate more channels, more bandwidth is required within the operating band. For portable devices, circularly polarized (CP) antennas are more advantageous over linearly polarized antennas since in CP antennas, there is low risk of misalignment and, hence encountering interference. Circularly polarized antenna also provides higher link reliability for the portable devices. To provide high data rates, more bandwidth is needed to accommodate more channels. Various multifunction, compact, and wideband antennas for plethora of applications are addressed in detail in this book. The scope of developing reconfigurable active antennas for application in beam switching, beam steering, wireless charging, security systems, etc., is described. This book concludes by giving glimpses of antenna requirements for future wireless communication systems.

Download or read book Multifunctional and Multiband Planar Antennas for Emerging Wireless Applications written by Jayshri Kulkarni and published by CRC Press. This book was released on 2023-12-19 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes designed miniaturized monopole antennas for laptop computers with dual/triple band operations, performance enhancement, wider bandwidth, and increased data rate Explores the design of equivalent circuit diagrams of the proposed antenna. Presents integration of designed antennas into laptop for the validation of desired outcome Identifies and discusses technical challenges and new results related to the design of 5G/WLAN antennas Contains graphical illustration, design steps, detail analysis of each step along with proper justification

Download or read book Developments in Antenna Analysis and Synthesis written by Raj Mittra and published by Electromagnetics and Radar. This book was released on 2018-10 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developments in Antenna Analysis and Design presents recent developments in antenna design and modeling techniques for a wide variety of applications, chosen because they are contemporary in nature, have been receiving considerable attention in recent years, and are crucial for future developments. It includes topics such as body-worn antennas, that play an important role as sensors for Internet of Things (IoT), and millimeter wave antennas that are vitally important for 5G devices. It also covers a wide frequency range that includes terahertz and optical frequencies. Additionally, it discusses topics such as theoretical bounds of antennas and aspects of statistical analysis that are not readily found in the existing literature. This first volume covers the theory of characteristic modes (TCM) and characteristic bases; wideband antenna element designs; MIMO antennas; antennas for wireless communication; reconfigurable antennas employing microfluidics; flexible and body-worn antennas; and antennas using meta-atoms and artificially-engineered materials, or metamaterials (MTMs). A second volume covers the topics of: graphene-based antennas; millimeter-wave antennas; terahertz antennas; optical antennas; fundamental bounds of antennas; fast and numerically efficient techniques for analyzing antennas; statistical analysis of antennas; ultra-wideband arrays; reflectarrays; and antennas for small satellites, viz., CubeSats. The two volumes represent a unique combination of topics pertaining to antenna design and analysis, not found elsewhere. It is essential reading for the antenna community including designers, students, researchers, faculty engaged in teaching and research of antennas, and the users as well as decision makers.

Download or read book Novel Ultra wideband Vivaldi Antenna and Mechanically Reconfigurable Antenna Arrays written by Jack Eichenberger and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antennas are ubiquitous in the modern world, as they underlie wireless communication. Ultra-wideband (UWB) antennas have a number of benefits, including reduced cost, minimal system footprint, resistance to jamming, and improved image quality. Vivaldis are a particularly attractive UWB candidate due to their planar shape and uncomplicated feeding structure. This dissertation implements three design characteristics to a typical antipodal Vivaldi, yielding an antenna with high gain and a wider bandwidth than the state-of-the-art. These characteristics include an elliptical pseudoelement to enhance gain, notches to reduce side-lobe levels, and corrugations to reduce back-lobe levels. The antenna achieves a peak gain of 16 dB, and is matched from 2.5 to 57 GHz. It is linearly polarized with a purity of at least 10 dB across the band. The antenna was fabricated and tested, exhibiting good agreement between measurements and simulation. While UWB antennas have a multitude of uses, some applications, such as radar, require a very narrow beamwidth for accurate target location. An antenna array is the typical solution. Phased arrays achieve beam steering by introducing a variable inter-element phase shift through devices such as PIN diodes, varactor diodes, FET switches, and more. While effective, these approaches require a bias circuit which can have unwanted effects on the system’s radiation. Alternatively, mechanically steered approaches such as physical rotation of an array or tuning screws in a feeding waveguide power divider can be used. Both of these approaches are power intensive and occupy a large footprint. This dissertation provides a novel mechanically steerable slot array that is inexpensive, reliable, scalable to arbitrary array sizes, planar, and is controlled by a singular input. A slot array is fragmented into plates then connected to accordion structures. These accordion structures allow for a uniform yet variable spacing. A microactuator is used to extend and contract the accordions. The array scans continuously from roughly 0 to -30° at 16 GHz with realized gain ranging from 20 to 24 dB. It is linearly polarized with purity over 25 dB. This approach provides a cost effective and low-profile alternative to mechanical scanning while being simple to control. The array is tested in an anechoic chamber while the beam pattern is controlled by a micromotor with a user input. Metasurfaces (MS), periodic structures composed of sub-wavelength unit cells, can be used for gain enhancement, beam steering, and filtering. Typically a metasurface is fixed, but reconfigurable structures offer more versatility. Similarly to arrays, an electrical or mechanical approach is often taken. Unit cells can be loaded PIN diodes or varactor diodes to vary performance, but this requires an increasingly large bias circuit proportional to MS size. In the mechanical realm, each element would need to be individually tuned, which becomes rapidly impractical as the surface gets larger. This dissertation makes the novel contribution of a magnetically reconfigurable metasurface filter. A substrate that is rigid at room temperature but flexible when heated is magnetically doped to allow for a two state device that can be actuated by a magnetic field then locked. This approach allows for theoretically contactless reconfiguration, as only heat and a DC magnetic field are necessary. The polymer is metallized with copper tape in such a way to reversibly switch between an all-pass and band-reject state. The structure is placed between two horn antennas and compared to a reference measurement to validate its behavior.

Download or read book Reflectarray Antennas Analysis Design Fabrication and Measurement written by Jafar Shaker and published by Artech House. This book was released on 2013-11-01 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reflectarray antennas refer to the class of radiating structures that are comprised of an array of radiating elements, re-radiating the energy that is impinged on them from one or more radiating feeds that are located in free space. The constituent radiators that build a reflectarray can be shaped to bring about some flexibility in the way that antenna operates such as multi band/polarization operation. The printed nature of these elements allow integration of active elements that can further enhance the functionality of the reflectarray. This allows for capabilities such as power amplification, adaptive beam shaping, and beam switching. This resource presents readers with design guidelines along with an ample amount of material on different types of reflectarrays and methods of analysis. This book begins with introductory material on reflectarray antennas and progresses to the presentation of state-of-the-art research in the field. A direct comparison with conventional reflector antennas is provided, focusing on conventional efficiency figures of reflectors. Moreover, this book offers remarks on the future direction of reflectarray research and also potential applications of the technology in face of the emergence of new fabrication techniques to accommodate both passive and active elements.

Download or read book Reconfigurable Dual band and Wide band Spatially fed Array Antennas written by Min Yin Xu and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the designs of two reconfigurable spatially-fed antenna arrays with the potential to be applied in satellite communications. The first design is a dual-band circularly-polarized reflectarray antenna (RA). The RA unit cell is comprised of two concentric microstrip rings, one for each operation frequency. Each ring is loaded with four varactor diodes to achieve CP response through concurrent manipulation of both vertically and horizontally polarized waves. Experimental characterization of the unit cell showed sufficient phase-shifting capability covering the two frequency bands of interest. The second design is a reconfigurable Huygens' metasurfaces (HMS) that have the potential of obtaining wideband tunable responses by incorporating tunable elements into the surface. This is possible since the HMS implements both the electric and magnetic responses. An equivalent circuit model for the HMS is presented, followed by a low-complexity reconfigurable HMS unit cell design.

Download or read book Reflectarray Antennas written by John Huang and published by John Wiley & Sons. This book was released on 2007-11-09 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the configuration and principles of a reflectarray antenna, its advantages over other antennas, the history of its development, analysis techniques, practical design procedures, bandwidth issues and wideband techniques, as well as applications and recent developments. Both authors are well respected practitioners who have build these antennas and developed them for space flight.