Download or read book Theoretical and Experimental Study of Mutual Coupling Between Antennas written by W. K. Wong and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Study of Mutual Coupling Between Elements of a Wide Aperture Radio Location Antenna written by Fred Ore and published by . This book was released on 1964 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation demonstrated some of the effects of mutual coupling on the impedance characteristics of an element of the large circular array being considered. It was shown that the minimum practical spacing between phase centers of adjacent elements of the array is on the order of 3/16 lambda with an even wider spacing being desirable. In addition, the investigation showed that the impedance characteristics of an element are severely deteriorated over approximately a 15 percent band just below the frequency where a new band is to begin. Since the completion of this investigation, a combination theoretical and experimental investigation has been conducted on a 500:1 scale pattern model to determine a low frequency limit element spacing based on acceptable radiation pattern performance. (See AD-429 235) Thus, from this impedance investigation and from the pattern investigation, it would appear that the low frequency limit adjacent phase center spacing must be on the order of .175 lambda if the acceptable pattern performance with the impedance performance as described is to be achieved.
Download or read book Mutual Coupling Between Antennas written by Trevor S. Bird and published by John Wiley & Sons. This book was released on 2021-06-28 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Theoretical and Experimental Study of Arrays of Axial Slots on a Circular Cylinder written by Dipak L. Sengupta and published by . This book was released on 1974 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The radiation patterns produced by arrays of axial slots on a conducting circular cylinder of infinite length are studied theoretically and experimentally. The required phase of excitation of elements to produce a beam in a certain direction are obtained by approximating the array by a section of a circular array of isotropic sources. For the given radius of the cylinder and the frequency band of interest, the approximation is found to yield satisfactory results. Radiation patterns produced by arrays of 2, 3 and 4 axial slots are numerically computed and discussed. Theoretical results are also compared with measured results and the agreement between the two has been found satisfactory.
Download or read book Theoretical and Experimental Investigation of Some Slot Antenna Array Problems written by R. S. Elliott and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of metallic fences on mutual coupling between slots of a slot antenna is studied. A model solution has been obtained whereby the fence is modelled as a thin half elliptic cylinder. This model allows for thickness to be taken into account and provides exact solutions to mutual impedance computations. The geometrical theory of diffraction has been adopted to analyze an exceedingly thin fence, when the slot antennas are not too close to the fence. Design procedures for longitudinal and traverse stripline-fed slots have been developed. A design procedure for such slot arrays requires knowledge of the mutual coupling relation as well as the self-impedance properties of a slot. Preliminary design equations are reported in this document. (Author).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Note written by and published by . This book was released on 1970 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book OAR Cumulative Index of Research Results written by and published by . This book was released on 1967 with total page 1264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theoretical and Experimental Studies of Antennas and Arrays in a Parallel plate Region Part Iv Wave Propagation Along Infinite Yagi type Array in a Parallel plate Region written by B. Rama Rao and published by . This book was released on 1963 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: An approximate expression for the phase velocity of wave propagation along an infinite Yagi-type array in a parallel-plate region was derived by a variational method. The dependence of the propagation constant on the various geometrical parameters of the array is discussed. For antenna lengths less than a half-wavelength and for short distances between elements, it was shown that there can be two independent surface wave modes propagating along the structure. A transcendental equation for the propagation con stant of the periodic structure was also obtained by a more rigorous impedance pproach taking into account the mutual coupling between antenna ele ments. The design and fabrication of the experi mental equipment is described. An outline of the proposed experimental work is given and methods for measuring the propagation constant, gain, front-to-back ratio, current-distribution on the elements, radiation pattern, input impedance, longitudinal and transverse field distribution and excitation efficiency of the array are described. (Author).
Download or read book Fundamentals of Aperture Antennas and Arrays written by Trevor S. Bird and published by John Wiley & Sons. This book was released on 2016-01-19 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended as an advanced text for courses in antennas, with a focus on the mature but vital background field of aperture antennas. The book is aimed at final year, MSc, PhD and Post-Doctoral students, as well as readers who are moving from academia into industry, beginning careers as wireless engineers, system designers, in R&D, or for practising engineers. It assumes the reader has undertaken an earlier course of study on Maxwell's equations, fields and waves. Some of these topics are summarised in the early few chapters in order to provide continuity and background for the remaining chapters. The aperture antennas covered include the main types of horns, reflectors and arrays as well as microstrip patches, reflectarrays and lenses. To provide more than a superficial treatment of arrays, the topic of mutual coupling is covered in greater detail than most similar books in the area. Also included is an introduction to arrays on non-planar surfaces, which is of importance for applications that involve curved surfaces such as in aerodynamics or for making aperture antennas unobtrusive. A chapter is included on some modern aperture antennas to illustrate design techniques beyond the most common types of aperture antennas described in the early chapters. This is to show where advances have recently been made and where they could be improved in the future. Also included are selected topics of a practical nature for aperture antennas, namely fabrication and measurement.
Download or read book Reduction of Mutual Coupling Using Perfectly Conducting Fences written by R. J. Mailloux and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin perfectly conducting fences used to reduce mutual coupling of two parallel plane waveguides.
Download or read book Microstrip Antenna Design Handbook written by Ramesh Garg and published by Artech House. This book was released on 2001 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on Bahl and Bhartia's popular 1980 classic, Microstrip Antennas, this all new book provides the detail antenna engineers and designers need to design any type of microstrip antenna. After addressing essential microchip antenna theory, the authors highlight current design and engineering practices, emphasizing the most pressing issues in this area, including broadbanding, circular polarization, and active microstrip antennas in particular. Special design challenges, ranging from dual polarization, high bandwidth, and surface wave mitigation, to choosing the proper substrate, and shaping an antenna to achieve desired results are all covered.
Download or read book Experimental Study of Coupled Thick Antennas written by Bob M. Duff and published by . This book was released on 1971 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of an experimental study of two identical, parallel, nonstaggered thick antennas are presented in this report. The term 'thick antenna' means a cylindrical dipole whose radius is significant compared to the free space wavelength of the exciting signal. Three thicknesses of antenna were used in the experiment: ka = 0.318, 0.639, and 0.877. Measurements were made of the apparent input admittance for both symmetric and antisymmetric drive, from which apparent self- and mutual admittances were computed. Both axial and transverse components of the current on the surface of the antennas were measured as functions of the cylindrical coordinates phi and z associated with the antenna. A complete description is given of the experimental system including the design of the antenna system, the arrangement for driving the antennas, a description of the measuring system, and a discussion of some of the problems encountered in carrying out the measurements. The variations of self- and mutual admittance as a function of spacing between antennas is shown with comparison to the behavior of thin antennas. Available theoretical results for the current distribution on coupled thick antennas are compared with the measured current distributions. (Author).
Download or read book Experimental Study of Coupled Linear Antennas in an Inhomogeneous Dissipative Medium written by Thomas Sugimoto and published by . This book was released on 1970 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of a pair of coupled linear antennas in an inhomogeneous dissipative medium was made. The medium was obtained by diffusing a water solution of NaCl into a large block of agar agar gel contained in a wooden tank. The relative dielectric constant was approximately 78 while the loss tangent could be varied from 0.13 to 3.0 at 114 MHz, the frequency used throughout the investigation. Driving point admittances and current distributions were measured with the medium inhomogeneity oriented parallel to the axes of the antennas. Self and mutual input admittances were measured as a function of the antenna length (beta h = 0.3 to 2 pi in steps of 0.1). Symmetric and antisymmetric current distributions were measured for four different antenna lengths (h/lambda = 0.25, 0.50, 0.75, and 1.0). Each measurement was repeated for three antenna separations (beta/lambda = 0.125, 0.25, and 0.50). Self and mutual driving-point admittances were measured as a function of base separation (b/lambda = 0.25 to 1.5 in steps of 0.125) for four antenna lengths (h/lambda = 0.25, 0.50, 0.75, and 1.0) with the medium inhomogeneity direction perpendicular to the antenna axes. Also studies were the effects of a medium discontinuity at the input, nonidentical elements, and input aperture size on the measured input admittance. (Author).
Download or read book Advances in Microwave Engineering written by Ankan Bhattacharya and published by CRC Press. This book was released on 2023-11-21 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text showcases recent advancements in the field of microwave engineering, starting from the use of innovative materials to the latest microwave applications. It also highlights safety guidelines for exposure to microwave and radio frequency energy. The book provides information on measuring circuit parameters and dielectric parameters. • Explains microwave antennas, microwave communication, microwave propagation, microwave devices, and circuits in detail • Covers microwave measurement techniques, radiation hazards, space communication, and safety measures • Focuses on advanced computing technologies, wireless communication, and fiber optics • Presents scattering matrix and microwave passive components and devices such as phase shifters and power dividers • Showcases the importance of space communication, radio astronomy, microwave material processing, and advanced computing technologies The text provides a comprehensive study of the foundations of microwave heating and its interactions with materials for various applications. It also addresses applications of microwave devices and technologies in diverse areas, including computational electromagnetics, remote sensing, transmission lines, radiation hazards, and safety measures. It emphasizes the impact of resonances on microwave power absorption and the effect of nonuniformity on heating rates. The text is primarily written for senior undergraduate students, graduate students, and academic researchers in the fields of electrical engineering, electronics and communication engineering, computer engineering, and materials science.
Download or read book Defected Ground Structure DGS Based Antennas written by Debatosh Guha and published by John Wiley & Sons. This book was released on 2022-12-28 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Defected Ground Structure (DGS) Based Antennas A unique exploration of critical topics in defected ground structures and their applications In Defected Ground Structure (DGS) Based Antennas: Design Physics, Engineering, and Applications, three distinguished authors deliver a comprehensive discussion of key topics related to defected ground structures (DGSs) and their applications to advanced antenna designs, including microstrips, arrays, dielectric resonators, PIFA, and printed monopoles. The book explores major advances in the technology that have occurred since 2006, as well as the fundamentals of the research in the subject. It also presents future possibilities for new researchers to assist in the development of new studies and technologies for practicing engineers and developers. Readers will discover: A thorough introduction to the concept and evolution of defected ground structure-based antennas In-depth examinations of defected ground structures for printed antenna feeds Comprehensive discussions of the use of defected ground structures to control unwanted modes under a microstrip patch for reducing cross-polarized radiation Enlightening descriptions of defected ground structures used to control mutual coupling in arrays and MIMO designs Perfect for students, researchers, and professionals with an interest in wireless communications, Defected Ground Structure (DGS) Based Antennas: Design Physics, Engineering, and Applications will also earn a place in the libraries of engineers and scientists working in space exploration and defense organizations.
Download or read book U S Government Research Reports written by and published by . This book was released on 1964 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt:
