Download or read book A LEAKY WAVE ANTENNA WITH A CURVED APERTURE written by and published by . This book was released on 1960 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Dielectric loaded Leaky Wave Antenna written by Jorgen Aasted and published by . This book was released on 1961 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design and the measured performance are described of a flat, leaky-wave antenna in which the inductive, leaky surface is backed with a slab of dielectric. The analysis is based on a transverse resonance analysis which determines the physical dimensions of the antenna for a certain specified aperture distribution. An antenna was built to compare the theoretical behavior with the measured performance. Two ways of forming the dielectric to the antenna were tested. When the dielectric was molded in place the radiation pattern agreed very well with the theoretically predicted pattern, but high losses in the casting resin gave a lower gain for the antenna than anticipated. For a machined piece of dielectric, the radiation pattern was not as close to the predicted pattern as for the molded sample, but the gain was close to the predicted value. The antenna consists of a 28-by-18-inch through filled with a dielectric material over which a sheet of parallel wires is strung. At the design frequency, 4.75 gc, the antenna radiates a pencil beam 9.4 by 8.3 degrees wide at an angle of 54 degrees measured from the normal to the inductive surface. The beam can be scanned from approximately 75 degrees down to 12 degrees from the normal to the aperture by changing the frequency from 5.25 gc to 4.20 gc. (Author).

Download or read book A Leaky wave Antenna with a Curved Aperature written by Richard C. Honey and published by . This book was released on 1960 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aperture Antennas for Millimeter and Sub Millimeter Wave Applications written by Artem Boriskin and published by Springer. This book was released on 2017-09-05 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the technology of millimetre waves and Terahertz (THz) antennas. It highlights the importance of moderate and high-gain aperture antennas as key devices for establishing point-to-point and point-to-multipoint radio links for far-field and near-field applications, such as high data-rate communications, intelligent transport, security imaging, exploration and surveillance systems. The book provides a comprehensive overview of the key antenna technologies developed for the mm wave and THz domains, including established ones – such as integrated lens antennas, advanced 2D and 3D horn antennas, transmit and reflect arrays, and Fabry-Perot antennas – as well as emerging metasurface antennas for near-field and far-field applications. It describes the pros and cons of each antenna technology in comparison with other available solutions, a discussion supplemented by practical examples illustrating the step-by-step implementation procedures for each antenna type. The measurement techniques available at these frequency ranges are also presented to close the loop of the antenna development cycle. In closing, the book outlines future trends in various antenna technologies, paving the way for further developments. Presenting content originating from the five-year ESF research networking program ‘Newfocus’ and co-authored by the most active and highly cited research groups in the domain of mm- and sub-mm-wave antenna technologies, the book offers a valuable guide for researchers and engineers in both industry and academia.

Download or read book OAR Quarterly Index of Current Research Results written by United States. Air Force. Office of Aerospace Research and published by . This book was released on 1959 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Government Research Reports written by and published by . This book was released on 1962 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Radiation from Apertures in Convex Bodies written by Lev Nikolaevich Zakharʹev and published by . This book was released on 1970 with total page 232 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 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Traveling Wave Antennas written by Carlton H. Walter and published by New York: Dover Publications. This book was released on 1970 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Leaky wave Antennas Using Periodically Spaced Small Apertures written by W. J. Getsinger and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Journal of Research written by United States. National Bureau of Standards and published by . This book was released on 1964 with total page 1354 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Leaky Wave Antennas on Curved Surfaces written by Eric G. Lean and published by . This book was released on 1963 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Balanis Advanced Engineering Electromagnetics written by Constantine A. Balanis and published by John Wiley & Sons. This book was released on 2024-01-24 with total page 1140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Balanis’ Advanced Engineering Electromagnetics The latest edition of the foundational guide to advanced electromagnetics Balanis’ third edition of Advanced Engineering Electromagnetics - a global best-seller for over 30 years - covers the advanced knowledge engineers involved in electromagnetics need to know, particularly as the topic relates to the fast-moving, continuously evolving, and rapidly expanding field of wireless communications. The immense interest in wireless communications and the expected increase in wireless communications systems projects (antennas, microwaves and wireless communications) points to an increase in the number of engineers needed to specialize in this field. Highlights of the 3rd Edition include: A new chapter, on Artificial Impedance Surfaces (AIS), contains material on current and advanced EM technologies, including the exciting and fascinating topic of metasurfaces for: Control and broadband RCS reduction using checkerboard designs. Optimization of antenna fundamental parameters, such as: input impedance, directivity, realized gain, amplitude radiation pattern. Leaky-wave antennas using 1-D and 2-D polarization diverse-holographic high impedance metasurfaces for antenna radiation control and optimization. Associated MATLAB programs for the design of checkerboard metasurfaces for RCS reduction, and metasurface printed antennas and holographic L WA for radiation control and optimization. Throughout the book, there are: Additional examples, numerous end-of-chapter problems, and PPT notes. Fifty three MATLAB computer programs for computations, graphical visualizations and animations. Nearly 4,500 multicolor PowerPoint slides are available for self-study or lecture use.

Download or read book An Investigation of the Log Periodic Antenna as a Leaky Wave Device written by Frederick T. Halsey and published by . This book was released on 1963 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Near field measurements available in the literature show that two waves exist on log periodic antennas. The first, called the transmission line wave originates at the apex, propagates along the antenna and decays in the active region. The second, called the radiation wave originates in the active region, propagates back toward and beyond the apex, and becomes the far field at a suitable distance in front of the antenna. The hypothesis is made that the effective radiating aperture is located at the front of the active region and is in the plane perpendicular to the antenna structure. The aperture distribution is obtained by considering the radiation wave to behave as a leaky wave in the active region. The far field pattern is found from this aperture distribution using a transform technique. Suitable assumptions are made relating the characteristics of the radiation and transmission line waves in the active region. Thus, the far field pattern can be calculated if the properties of the transmission line wave are known. The transform used is valid only in the half plane to the front of the antenna. Thus, the theory will predict only the shape of the main lobe since no information is obtained regarding the energy radiated to the rear of the antenna. The characteristics of the transmission line wave for the log periodic dipole antenna were measured for various parameters of the antenna and these used to calculate the far field patterns. These calculated patterns were found to show reasonably good agreement with experimentally obtained patterns over the useable range of parameters for this antenna.

Download or read book Journal of Research National Bureau of Standards written by United States. National Bureau of Standards and published by . This book was released on 1964 with total page 1400 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modern Antenna Handbook written by Constantine A. Balanis and published by John Wiley & Sons. This book was released on 2011-09-20 with total page 1617 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most up-to-date, comprehensive treatment of classical and modern antennas and their related technologies Modern Antenna Handbook represents the most current and complete thinking in the field of antennas. The handbook is edited by one of the most recognizable, prominent, and prolific authors, educators, and researchers on antennas and electromagnetics. Each chapter is authored by one or more leading international experts and includes cover-age of current and future antenna-related technology. The information is of a practical nature and is intended to be useful for researchers as well as practicing engineers. From the fundamental parameters of antennas to antennas for mobile wireless communications and medical applications, Modern Antenna Handbook covers everything professional engineers, consultants, researchers, and students need to know about the recent developments and the future direction of this fast-paced field. In addition to antenna topics, the handbook also covers modern technologies such as metamaterials, microelectromechanical systems (MEMS), frequency selective surfaces (FSS), and radar cross sections (RCS) and their applications to antennas, while five chapters are devoted to advanced numerical/computational methods targeted primarily for the analysis and design of antennas.

Download or read book A New Leaky Wave Antenna for Millimeter Waves Based on the Groove Guide written by P. Lampariello and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leaky wave antennas for millimeter waves face two main problems. The first relates to the small wavelengths involved, which require small waveguide dimensions and pose fabrication difficulties. The second problem is higher metal loss. In the new leaky wave antenna described and analyzed here, we overcome the first of these problems by choosing a structure with a longitudinally continuous aperture, and the second by basing the antenna on a low-loss waveguide, the groove guide. The groove guide is an open waveguide, but its dominant mode is purely bound by virtue of structural symmetry. By placing a longitudinal asymmetric metal strip along the guide, the symmetry is distributed and a new TEM-like mode is produced in the transverse direction that propagates to the open end and leaks power away. An accurate theoretical analysis is presented for the performance properties of this antenna structure. The cross section is represented by a transverse equivalent network that contains some subtle features. All of the elements of this transverse network are obtained in closed form, so that the dispersion relation for the propagation characteristics is likewise in closed form.