Download or read book Reconfigurable Compact Cross Patch Antenna for Switchable Polarization written by Nishamol Saidmuhammed and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antennas are necessary and vital components of communication and radar systems, but sometimes their mobility to adjust to new operating scenarios can limit system performance. Reconfigurable antennas can adjust with changing system requirements or environmental conditions and provide additional levels of functionality that may result in wider instantaneous frequency bandwidths, more extensive scan volumes and radiation patterns with more desirable side lobe distributions. Their agility and diversity created new horizons for different types of applications especially in cognitive radio, Multiple Input Multiple Output Systems, satellites and many other applications. Reconfigurable antennas satisfy the requirements for increased functionality, such as direction finding, beam steering, radar, control and command, within a confined volume.

Download or read book A Reconfigurable Microstrip Antenna for Switchable Polarization and Switchable Frequency written by Fatima Abdel Atef Al Sayed and published by . This book was released on 2009 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the remarkable progressions in wireless communications, there is an increas ing demand for miniature, low-cost, easy-to-fabricate, multiband and moderate ga in antennas for use in commercial communications systems. A design approach that employs the aspects of reconfigurability and switchability from an antenna engi neering perspective was implemented in this thesis in order to design a reconfig urable microstrip antenna for switchable polarization and switchable frequency. These designs were fabricated on a 1.6 mm-thick FR4_epoxy substrate with dimensi ons 40mm x 70mm and 44mm x 73mm, microstrip-line fed and have complete ground pl ane flushed with the feed line. The novel antennas were simulated using two tech niques Ansoft HFSS (FEM) and ADS Momentum (MoM). Both techniques revealed an ac curacy and reliability in all the responses and for all the cases in the switchi ng conditions. Moreover the return loss, the total gain, and the radiation patte rn for all the designs with their varied switchable modes were simulated at the resonant frequency. The different switching scenarios revealed a switch-state de pendent approach in terms of all the results. The designed antenna can be used for applications including GSM (2G) and UMTS (3 G). By this approach the switchable frequency is introduced, where there should be coverage for the different frequencies.

Download or read book Reconfigurable Antennas written by Jennifer T. Bernhard and published by Morgan & Claypool Publishers. This book was released on 2007-12-01 with total page 74 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 A Frequency Reconfigurable Circularly Polarized Microstrip Patch Antenna Using Liquid Metal Microswitches written by Steven Christopher Yee and published by . This book was released on 2013 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reconfigurable antennas with adaptable frequency, pattern, and polarization offer flexibility and size reduction for wireless systems that must increasingly execute multiple missions with less volume. These antennas will also complement anticipated cognitive radio systems, which promise more efficient use of the electromagnetic spectrum. Microscale liquid metal switches are proposed to overcome the series loss, mechanical fatigue, and limited power handling reliability of common methods of antenna reconfiguration such as semiconductor diodes and microelectromechanical switches. The proposed microswitches consist of mercury droplets that selectively connect solid metal traces. Both fluidic and electrostatic switch actuation mechanisms are investigated, and an electrostatic switch is demonstrated. Electrostatically actuated switches are designed into a compact single-feed patch antenna configurable between two communication frequency bands and a GPS band with different circular polarizations. The antenna topology is based on a corner truncated square patch with switched sets of extensions to achieve resonant frequency and axial ratio control. Measurements of reconfigurable prototypes demonstrate frequency and polarization configurability in good agreement with full-wave simulations. The proposed reconfiguration mechanism is compared to other methods, and future directions for the integration of microfluidics in reconfigurable radio frequency systems are proposed.

Download or read book Multifunctional Antennas and Arrays for Wireless Communication Systems written by Satish K. Sharma and published by John Wiley & Sons. This book was released on 2021-05-04 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: MULTIFUNCTIONAL ANTENNAS AND ARRAYS FOR WIRELESS COMMUNICATION SYSTEMS Offers an up-to-date discussion of multifunctional antennas and arrays for wireless communication systems Multifunctional Antennas and Arrays for Wireless Communication Systems is a comprehensive reference on state-of-the-art reconfigurable antennas and 4G/5G communication antennas. The book gives a unique perspective while giving a comprehensive overview of the following topics: Frequency reconfigurable antennas Pattern reconfigurable antennas Polarization reconfigurable antennas Reconfigurable antennas using Liquid Metal, Piezoelectric, and RF MEMS MIMO and 4G/5G wireless communication antennas Metamaterials and metasurfaces in reconfigurable antennas Multifunctional antennas for user equipments (UEs) Defense related antennas and applications Flat panel phased array antennas The book is a valuable resource for the practicing engineer as well as for those within the research field. As wireless communications continuously evolves, more and more functionally will be required, and thus multifunctional antennas and RF systems will be necessary. These multifunctional antennas will require a degree of reconfigurability, and this book discusses various methods which enable this. The main topics of frequency, pattern, and polarization reconfigurability is first discussed. Methods utilizing unique materials and devices, both real and artificial are discussed. The book also delves into 4G/5G antennas as it relates to MIMO, and millimeter-wave phased arrays. Finally, there is a section on defense related multifunctional RF antenna systems.

Download or read book Multi Band and Reconfigurable Antennas for Wireless Devices written by Yunfei Cao and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Multi-band and Reconfigurable Antennas for Wireless Devices" by Yunfei, Cao, 曹雲飛, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: This thesis presents the designs of a multi-band slot antenna, a frequency-reconfigurable (FR) monopole antenna, a frequency-reconfigurable multiple-input-multiple-output (FR MIMO) antenna, a polarization-reconfigurable (PR) monopole antenna, a new metasurface (MS) and a circular-polarization-reconfigurable metasurface (CPR MS) monopole antenna. The multi-band slot antenna consists of a rectangular slot, a T-shaped feeding patch, an inverted T-shaped stub and two E-shaped stubs and has a compact area. The rectangular slot and the inverted T-shaped stub together generate the 1st band. The two E-shaped stubs operating as monopole radiators generate the 2nd band. By using a double-folded stub in the T-shaped feeding patch, two resonant frequencies, i.e., 3rd and 4th bands, can be generated and tuned independently. With this method, the slot antenna can have four operating bands and a size smaller than the previous works. The effect of the feeding cable used in measurement and of the cover used in wireless devices is also investigated. In the FR planar monopole antenna, the radiator consists of two sections, section I and II, which are connected together using a PIN-diode. Section I alone generates a high-frequency band, while section II, when electrically connected together with section I using the PIN-diode, generates a low-frequency band. The radiator of the antenna is meandered for compact size. Continuous tuning of the two operating bands is accomplished by placing a varactor on section I of the radiator, leading to a wide tuning range of 2.39-3.0 GHz. With the use of this technique, a FR monopole antenna and a FR MIMO monopole antenna with wide-continuous tuning are designed. In the FR MIMO monopole antenna, a reconfigurable defected ground structure (DGS) employing two PIN diodes is designed to switch isolation across the whole tuning band. A simple and novel biasing circuit using only three direct current (DC) wires is designed to bias the diodes. The PR monopole antenna consists of two meandered radiators placed perpendicular to each other, a feeding network using the Wilkinson power divider, two switchable 900-phase shifters with PIN-diode switches for control, and a DGS. The antenna is more compact and has a wider axial-ratio bandwidth than those of the previous PR antennas. A phase shifter and a double-pole double-throw (DPDT) switch are used to reduce the complexity of the biasing circuit, and a metallic reflector is placed at the back of the antenna to increase the boresight gain. The dual-cap mushroom-like metasurface (MS) is a new design, with each unit cell having a simple patch with a centered via on one side of the substrate and a meandered slot on the other side. The meandered slot introduces inductive effect to lower down the operating frequency and increase the operating bandwidth. The dual-cap mushroom-like MS is used in the design of a compact CPR MS monopole antenna to enhance the boresight gain and bandwidth. Subjects: Antennas (Electronics)

Download or read book Printed Antennas written by Binod Kumar Kanaujia and published by CRC Press. This book was released on 2020-11-22 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Printed antennas have become an integral part of next-generation wireless communications and have been found to be commonly used to improve system capacity, data rate, reliability, etc. This book covers theory, design techniques, and the chronological regression of the printed antennas for various applications. This book will provide readers with the basic conceptual knowledge about antennas along with advanced techniques for antenna design. It covers a variety of analytical techniques and their CAD applications and discusses new applications of printed antenna technology such as sensing. The authors also present special reconfigurable antennas such as ME dipole, polarization, feeding, and DGS. The book will be useful to students as an introduction to design and applications of antennas. Additionally, experienced researchers in this field will find this book a ready reference and benefit from the techniques of research in printed antennas included in this book. Following are some of the salient features of this book: Covers a variety of analytical techniques and their CAD applications Discusses new applications of printed antenna technology such as sensing Examines the state of design techniques of printed antenna Presents special reconfigurable antennas such as ME dipole, polarization, feeding, and DGS

Download or read book Green Engineering and Technology written by Om Prakash Jena and published by CRC Press. This book was released on 2021-06-15 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: Escalating urbanization and energy consumption have increased the demand for green engineering solutions and intelligent systems to mitigate environmental hazards and offer a more sustainable future. Green engineering technologies help to create sustainable, eco-friendly designs and solutions with the aid of updated tools, methods, designs, and innovations. These technologies play a significant role in optimizing sustainability in various areas of energy, agriculture, waste management, and bioremediation and include green computing and artificial intelligence (AI) applications. Green Engineering and Technology: Innovations, Design, and Architectural Implementation examines the most recent advancements in green technology, across multiple industries, and outlines the opportunities of emerging and future innovations, as well as practical real-world implementation. Features: Provides different models capable of fulfilling the criteria of energy efficiency, health and safety, renewable resources, and more Examines recycling, waste management, and bioremediation techniques as well as waste-to-energy technologies Presents business cases for adopting green technologies including electronics, manufacturing, and infrastructure projects Reviews green technologies for applications such as energy production, building construction, transportation, and industrialization Green Engineering and Technology: Innovations, Design, and Architectural Implementation serves as a useful and practical guide for practicing engineers, researchers, and students alike.

Download or read book Wideband Multiband and Smart Reconfigurable Antennas for Modern Wireless Communications written by Matin, Mohammad A. and published by IGI Global. This book was released on 2015-08-26 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern society thrives on communication that is instant and available at all times, a constant exchange of information that encompasses everything from video streaming to GPS navigation. Experts even suggest that in the near future everything from our cars to our kitchen appliances will be connected to the internet, a feat that would not be possible without advanced wireless technology. Wideband, Multiband, and Smart Reconfigurable Antennas for Modern Wireless Communications showcases current trends and novel approaches in the design and analysis of the antennas that make wireless applications possible, while also identifying unique integration opportunities for antennas and wireless applications to work together. By featuring both theoretical and experimental approaches to integration, this book highlights specific design issues to assist a wide-range of readers including students, researchers, academics, and industry practitioners. This publication features chapters on a broad scope of topics including algorithms and antenna optimization, wireless infrastructure development, wireless applications of intelligent algorithms, antenna architecture, and antenna reconfiguration techniques.

Download or read book Polarization Reconfigurable Patch Antenna Using Microelectromechanical Systems MEMS Actuators written by and published by . This book was released on 2002 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Passive Reconfigurable Dual Linear and Dual Circular Polarization with CLRH TL for Microstrip Patch Antennas written by Alexander Dacey and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Passively controlled reconfigurable antennas are desirable for their relatively inexpensive cost compared to the intensive implementation of RF integrated circuits. Extensive research continues to go into structures utilizing frequency selective metamaterials and their applications in reconfigurable antennas in order to find alternatives to active components. Composite left/right-handed transmission lines (CLRH-TLs), consisting of series capacitors and shunt inductors, are one such structure that is capable of operating as a left-handed transmission line at select frequencies. In this thesis, we propose and investigate a unique frequency selective open circuit utilizing CLRH-TLs that operates as an electrical open and a transmission line at two different frequencies, as well as a quadrature hybrid that is configured with these structures to create the required power and phase distribution for dual linear and dual circular polarizations at four different frequencies. The frequency selective open circuit is verified through simulation and validated through prototyping. The modified quadrature hybrid is integrated in the feed system of an dual linear polarized aperture coupled square microstrip patch antenna that is set in a stacked arrangement to increase the bandwidth to 17% (10.7-12.7GHz). Equivalent circuits to the modified quadrature hybrid demonstrate the four polarizations at four frequencies."--Abstract.

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 Electronics and Signal Processing written by Gang Zhang and published by Frontiers Media SA. This book was released on 2022-09-14 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Micro and Nanoelectronics Devices Circuits and Systems written by Trupti Ranjan Lenka and published by Springer Nature. This book was released on 2022-09-12 with total page 519 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents select proceedings of the International Conference on Micro and Nanoelectronics Devices, Circuits and Systems (MNDCS-2022). The book includes cutting-edge research papers in the emerging fields of micro and nanoelectronics devices, circuits, and systems from experts working in these fields over the last decade. The book is a unique collection of chapters from different areas with a common theme and is immensely useful to academic researchers and practitioners in the industry who work in this field.

Download or read book Proceedings of 3rd International Conference on Artificial Intelligence Advances and Applications written by Garima Mathur and published by Springer Nature. This book was released on 2023-04-14 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers outstanding research papers presented in the 3rd International Conference on Artificial Intelligence: Advances and Application (ICAIAA 2022), held in Poornima College of Engineering, Jaipur, India, during April 23–24, 2022. This book covers research works carried out by various students such as bachelor, master and doctoral scholars, faculty and industry persons in the area of artificial intelligence, machine learning, deep learning applications in health care, agriculture, and business, security. It also covers research in core concepts of computer networks, intelligent system design and deployment, real-time systems, WSN, sensors and sensor nodes, SDN, NFV, etc.

Download or read book Antenna Fundamentals for Legacy Mobile Applications and Beyond written by Issa Elfergani and published by Springer. This book was released on 2017-10-03 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights technology trends and challenges that trace the evolution of antenna design, starting from 3rd generation phones and moving towards the latest release of LTE-A. The authors explore how the simple monopole and whip antenna from the GSM years have evolved towards what we have today, an antenna design that is compact, multi-band in nature and caters to multiple elements on the same patch to provide high throughput connectivity. The scope of the book targets a broad range of subjects, including the microstrip antenna, PIFA antenna, and the monopole antenna to be used for different applications over three different mobile generations. Beyond that, the authors take a step into the future and look at antenna requirements for 5G communications, which already has the 5G drive in place with prominent scenarios and use-cases emerging. They examine these, and put in place the challenges that lie ahead for antenna design, particularly in mm-Wave design. The book provides a reference for practicing engineers and under/post graduate students working in this field.

Download or read book Smart Systems and IoT Innovations in Computing written by Arun K. Somani and published by Springer Nature. This book was released on 2019-10-26 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book features original papers from the 2nd International Conference on Smart IoT Systems: Innovations and Computing (SSIC 2019), presenting scientific work related to smart solution concepts. It discusses computational collective intelligence, which includes interactions between smart devices, smart environments and smart interactions, as well as information technology support for such areas. It also describes how to successfully approach various government organizations for funding for business and the humanitarian technology development projects. Thanks to the high-quality content and the broad range of the topics covered, the book appeals to researchers pursuing advanced studies.