Download or read book Computed Radiation Patterns of Log periodic Antennas Over Lossy Plane Ground written by Mark T. Ma and published by . This book was released on 1967 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four different orientations of a log-periodic dipole array of 11 elements over several types of ground are studied. With the xy-plane always treated as the flat ground, they are called 1) the x-array when dipole elements are parallel with the x-axis and the array axis is parallel with they-axis, 2) the y-array when dipoles are parallel with the y-axis and the array axis is coincident with the z-axis, 3) the z-array when dipoles are parallel with the z-axis and the array axis is parallel with the y-acix, and 4) the z=Ay=array when dipoles are parallel with the x-axis and the array axis makes an angle with the z-axis.

Download or read book Antenna Pattern Synthesis written by Donald R. Rhodes and published by . This book was released on 1972 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was made toward evolving a method of two-dimensional antenna pattern synthesis such that antenna specifications involving dimensionality, shape, and the constituent relations can be lated to the frequency characteristics. (Author).

Download or read book An Experimental Determination of Antenna Pattern Distortion Due to a Plasma Layer written by Daniel J. Jacavanco and published by . This book was released on 1964 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measured radiation patterns of a plasma-covered antenna are compared with an approximate leaky wave analysis due to Oliner and Tamir. The results clearly show a shift in the optics ''critical angle'' and the appearance of several side lobes are predicted by theory. The plasma is produced in a He - Xe admixture at 0.4 torr by a capacitively-coupled 10-Mcps cw source and contained in a rectangular pyrex vessel of interior dimensions 8 in. by 4 in. by 5 in. Electron densities in excess of 5 x 10 to the 11th power per cc are measured by a standard microwave interferometer by manually balancing a bridge or automatically by displaying a set of interference ''fringes'' after a pattern is recorded. (Author).

Download or read book Radiation from Variable reactance Surface wave Antennas written by M. G. Andreasen and published by . This book was released on 1961 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical study is presented of the properties of flush-mounted or wo-sided ariablereac ance surface-wave a tennas. he paradox of radiation from a constant-reactance surfacewave antenna is discussed also in order to derive an understanding of the principle of radiati n from a surface-wave antenna with periodicallly varying parameters. The principle of radiation from Simon's cigar a tenna which has caused some controversy, is discussed. Finally, a theory, which i in principle exact, is developed for a variable-reactance surface-wave a tenna. By this theory, the surface field can be determined using a field representation in terms of couples cylindrical mode . For practical designs approximate expre sions for the surface field are derived. (author).

Download or read book Plasma Produced Antenna Pattern Distortion written by Daniel J. Jacavanco and published by . This book was released on 1964 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Radiation Pattern Reactive Power and Resistive Aperture Antennas written by Giorgio V. Borgiotti and published by . This book was released on 1975 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main purpose of the report is to establish certain structural properties of a peculiar class of Plane Wave Spectra (PWS) representing an aperture field (or, equivalently of radiation patterns) which make the aperture reactive power equal to zero. To achieve this objective the entire question of the representation of an aperture field through a PWS is reexamined from a novel viewpoint. The Fourier transform (FT) of the transverse electric field on the aperture is considered as a two-dimensional vector field on the wavenumber plane, represented through two scalar functions, which are its coordinates in a chosen vector basis (Section 3). The choice of the latter has an important physical significance since it corresponds to the decomposition of the PWS into two components having differently polarized radiation patterns and different reactive properties. In Section 4, it is shown that the conductance and the susceptance of an aperture can be expressed as integrals (extended over the visible and invisible space) of two quadratic forms (whose explicit expressions depend upon the basis chosen to represent the PWS).

Download or read book Generalized Transmission Line Method to Study the Far zone Radiation of Antennas Under a Multilayer Structure written by Zuan Hui Wu and published by Springer Nature. This book was released on 2022-06-01 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a step-by-step presentation of a generalized transmission line method to study the far-zone radiation of antennas under a multilayer structure. Normally, a radiation problem requires a full wave analysis which may be time consuming. The beauty of the generalized transmission line method is that it transforms the radiation problem for a specific type of structure, say the multilayer structure excited by an antenna, into a circuit problem that can be efficiently analyzed. Using the Reciprocity Theorem and far-field approximation, the method computes the far-zone radiation due to a Hertzian dipole within a multilayer structure by solving an equivalent transmission line circuit. Since an antenna can be modeled as a set of Hertzian dipoles, the method could be used to predict the far-zone radiation of an antenna under a multilayer structure. The analytical expression for the far-zone field is derived for a structure with or without a polarizer. The procedure of obtaining the Hertzian dipole model that is required by the generalized transmission line method is also described. Several examples are given to demonstrate the capabilities, accuracy, and efficiency of this method. Table of Contents: Antennas Under a Multilayer Dielectric Slab / Antennas Under a Polarized Multilayer Structure / Hertzian Dipole Model for an Antenna / Bibliography / Biography

Download or read book Numerical Approach for Predicting Radiation Patterns of HF VHF Antennas Over Irregular Terrain written by Valdis V. Liepa and published by . This book was released on 1967 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility of using physical optics approximation for computing radiation patterns of ground-based HF-VHF antennas in the presence of known ground irregularities is investigated. A computer program was written for physical optics formulation to evaluate the composite radiation patterns of a line source above an irregular, but deterministic, perfectly conducting surface. For the special case of a line source above a perfectly conducting plane with semicylindrical boss,the exact field expressions are derived, and the numerical results are compared with those obtained by physical optics for the same geometry. An error criterion that gives a meaningful error estimate at both the maxima and minima values of the radiation pattern is formulated and applied to the computed result. It is concluded that physical optics approximations can be used for predicting the radiation patterns of ground-based HF-VHF antennas.

Download or read book Foundations of Antenna Radiation Theory written by Wen Geyi and published by John Wiley & Sons. This book was released on 2023-04-11 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understand the theory and function of wireless antennas with this comprehensive guide As wireless technology continues to develop, understanding of antenna properties and performance will only become more critical. Since antennas can be understood as junctions of waveguides, eigenmode analysis—the foundation of waveguide theory, concerned with the unexcited states of systems and their natural resonant characteristics—promises to be a crucial frontier in the study of antenna theory. Foundations of Antenna Radiation Theory incorporates the modal analysis, generic antenna properties and design methods discovered or developed in the last few decades, not being reflected in most antenna books, into a comprehensive introduction to the theory of antennas. This book puts readers into conversation with the latest research and situates students and researchers at the cutting edge of an important field of wireless technology. The book also includes: Detailed discussions of the solution methods for Maxwell equations and wave equations to provide a theoretical foundation for electromagnetic analysis of antennas Recent developments for antenna radiation in closed and open space, modal analysis and field expansions, dyadic Green’s functions, time-domain theory, state-of-the-art antenna array synthesis methods, wireless power transmission systems, and more Innovative material derived from the author’s own research Foundations of Antenna Radiation Theory is ideal for graduate or advanced undergraduate students studying antenna theory, as well as for reference by researchers, engineers, and industry professionals in the areas of wireless technology.

Download or read book A General Method for Designing Circular Array Antennas to Obtain Quasi omnidirectional Patterns written by Capers Rembert Cockrell and published by . This book was released on 1967 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Javelin Spike Antenna written by Roland R. Ford and published by . This book was released on 1961 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Satellite Communication Systems written by B.G. Evans and published by IET. This book was released on 1999 with total page 755 pages. Available in PDF, EPUB and Kindle. Book excerpt: Updates from unremarked dates material used in the Institute's vacation schools at Surrey University, which over the past 15 years have become the de-facto industry standard in satellite communications. The approach concentrates on the design and planning of systems, includes little theory, and just quotes equations rather than deriving them. New material has been added on the history and background of the field; the business aspects of satellite communications; and on new applications in mobile and personal communication systems, multimedia systems, military business and small satellites, navigation, and positioning. Graduate, undergraduate, and practicing engineers should benefit from the treatment. Annotation copyrighted by Book News, Inc., Portland, OR

Download or read book Antenna Theory and Design written by Warren L. Stutzman and published by John Wiley & Sons. This book was released on 2012-05-22 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stutzman's 3rd edition of Antenna Theory and Design provides a more pedagogical approach with a greater emphasis on computational methods. New features include additional modern material to make the text more exciting and relevant to practicing engineers; new chapters on systems, low-profile elements and base station antennas; organizational changes to improve understanding; more details to selected important topics such as microstrip antennas and arrays; and expanded measurements topic.

Download or read book The Handbook of Antenna Design written by Alan W. Rudge and published by IET. This book was released on 1982 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the fundamental background theory and analytical techniques of antenna design. It deals with a very wide range of antenna types, operating from very low frequencies to millimetre waves.

Download or read book Hybrid Intelligent Systems written by Ajith Abraham and published by Springer Nature. This book was released on 2021-04-16 with total page 817 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the recent research on hybrid intelligent systems and their various practical applications. It presents 58 selected papers from the 20th International Conference on Hybrid Intelligent Systems (HIS 2020) and 20 papers from the 12th World Congress on Nature and Biologically Inspired Computing (NaBIC 2020), which was held online, from December 14 to 16, 2020. A premier conference in the field of artificial intelligence, HIS - NaBIC 2020 brought together researchers, engineers and practitioners whose work involves intelligent systems, network security and their applications in industry. Including contributions by authors from 25 countries, the book offers a valuable reference guide for all researchers, students and practitioners in the fields of science and engineering.

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 Scaled model Measurements on a Nested tandem Array of Four Rhombic Antennas written by E. L. Kilpatrick and published by . This book was released on 1969 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: