Download or read book Dielectrically loaded wire antennas written by John Patrick Casey and published by . This book was released on 1987 with total page 612 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 Simulation of the Complete Current Distribution on Wire and Dielectric loaded Antennas Using Integral equation Methods written by Raed Abd-Almajeed Abd-Alhameed and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The modelling of non-uniform and transverse currents in wire antennas is first addressed. The normal-mode helical antenna is selected for study, as its surface current distribution can be critical when realised in superconducting form. This is modelled with straight and curved wire segments, using Electric Field Integral Equations solved by the Method of Moments with polynomial basis functions. Nonuniformity of the surface current around the cross section of the wire is represented using surface patch models. The components parallel to the wire axis are modelled using trigonometric series basis functions within the average current basis functions. The complete current distribution on the helix wire, including transverse components, is then obtained by applying two orthogonal basis functions on the wire surface. A new procedure for treating the wire ends and the current discontinuity at conductor edges is presented. It is shown that the deviation from the standard assumption of uniform axially-directed current can be large in some circumstances. Extending this work, a technique using rectangular and triangular surface patches to model any arbitrary conducting surface is presented and used to give the response of a wire, stripline or conducting surface in the vicinity of a lossy inhomogeneous dielectric. The dielectric is represented using the volume polarisation current theorem. Microstrip patch antennas of arbitrary shape on a thin and finite dielectric are also discussed. The numerical solutions obtained are highly stable and show good agreement with computed results obtained by other researchers using different approaches, and with several practical measurements.
Download or read book Dielectric and Dielectric Loaded Antennas written by Rajeswari Chatterjee and published by John Wiley & Sons. This book was released on 1985-11-07 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive survey of research on dielectric and dielectric-loaded antennas, providing a critical review of work carried out over the past thirty-five years. Covers a wide range of antenna shapes, types, and practical applications at microwave and millimetre wave frequencies.
Download or read book CAD of Wire Antennas and Related Radiating Structures written by Branko D. Popović and published by Taylor & Francis Group. This book was released on 1991 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: A discourse on the computer-aided design of wire antennas, which provides numerous examples of the scope of CAD processes, including descriptions of the WireZeus-based CAD of antennas and related radiating structures, along with their matching networks.
Download or read book Analysis of Thin wire Antennas in the Presence of a Dielectric and or Ferrite Inhomogeneity written by Pravit Tulyathan and published by . This book was released on 1976 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: A moment method solution for treating thin-wire antennas in the presence of an arbitrary dielectric and/or ferrite inhomogeneity is presented. The wire is modeled by an equivalent surface current density and the dielectric/ferrite inhomogeneity is modeled by equivalent volume polarization currents. The conduction currents on the wire and the polarization currents in the dielectric/ferrite inhomogeneity are treated as independent unknowns and determined in the moment method solution. The method is applied to the problem of a loop antenna loaded with dielectric or ferrite. Numerical results are presented, and are in good agreement with measurements and previous calculations. The material contained in this report is also used as a Thesis submitted to the Department of Electrical Engineering, The Ohio State University as partial fulfillment for the degree Master of Science. (Author).
Download or read book Analysis of Radiation by Wire Antennas Over Imperfect Ground written by Tapan K. Sarkar and published by . This book was released on 1975 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three user-oriented computer programs are presented and described for analyzing radiation from arrays of parallel vertical wires, parallel horizontal wires, and also arbitrary wire configurations over the surface of an imperfectly conducting earth. The first two programs are equipped to treat unequally spaced arrays of wires that can be of different lengths and radii and of arbitrary excitation and loading. The effects of the imperfectly conducting earth are accounted for in an essentailly exact manner by using the Sommerfeld formulation. The third program treats arbitrary wire antennas and incorporates the ground effects approximately by using the reflection-coefficient method. Computed output consists of current distribution, input impedances, and field patterns specified by the user.
Download or read book Small Antenna Handbook written by Robert C. Hansen and published by John Wiley & Sons. This book was released on 2011-10-25 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now in an completely revised, updated, and enlarged Second Edition, Small Antennas in Portable Devices reviews recent significant theoretical and practical developments in the electrically small antenna area. Examining antenna designs that work as well as those that have limitations, this new edition provides practicing engineers and upper level and graduate students with new information on: work on improving bandwidth using spherical helix dipoles; work on electromagnetically coupled structures; exact derivation of the Q for electrically small antennas for both the TE and TM modes; and a new simplified Q formula.
Download or read book Dielectrically Loaded Biconical Antennas written by Fouad Nusseibeh and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coupled Horizontal Wire Antennas Over a Conducting Or Dielectric Half Space written by L. C. Shen and published by . This book was released on 1977 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Small Antenna Handbook written by Robert C. Hansen and published by John Wiley & Sons. This book was released on 2011-08-26 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now in an completely revised, updated, and enlarged Second Edition, Small Antennas in Portable Devices reviews recent significant theoretical and practical developments in the electrically small antenna area. Examining antenna designs that work as well as those that have limitations, this new edition provides practicing engineers and upper level and graduate students with new information on: work on improving bandwidth using spherical helix dipoles; work on electromagnetically coupled structures; exact derivation of the Q for electrically small antennas for both the TE and TM modes; and a new simplified Q formula.
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 Assessment of Dielectrically Loaded Antennas for Airborne Communications Applications written by MS. Smith and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radiation by Dielectric loaded Antennas with Airgaps written by Sabah Jawad Towaij and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Loaded Dielectric Antennas written by Robert Dean Smith and published by . This book was released on 1951 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Antennas in Inhomogeneous Media written by Janis Galejs and published by Elsevier. This book was released on 2013-10-22 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antennas in Inhomogeneous Media details the methods of analyzing antennas in such inhomogeneous media. The title covers the complex geometrical configurations along with its variational formulations. The coverage of the text includes various conditions the antennas are subjected to, such as antennas in the interface between two media; antennas in compressible isotropic plasma; and linear antennas in a magnetoionic medium. The selection also covers insulated loops in lossy media; slot antennas with a stratified dielectric or isotropic plasma layers; and cavity-backed slot antennas. The book will be of great use to electrical, communications, and radio engineers.
Download or read book Antenna Theory written by Constantine A. Balanis and published by John Wiley & Sons. This book was released on 2005-04-04 with total page 1136 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discipline of antenna theory has experienced vast technological changes. In response, Constantine Balanis has updated his classic text, Antenna Theory, offering the most recent look at all the necessary topics. New material includes smart antennas and fractal antennas, along with the latest applications in wireless communications. Multimedia material on an accompanying CD presents PowerPoint viewgraphs of lecture notes, interactive review questions, Java animations and applets, and MATLAB features. Like the previous editions, Antenna Theory, Third Edition meets the needs of electrical engineering and physics students at the senior undergraduate and beginning graduate levels, and those of practicing engineers as well. It is a benchmark text for mastering the latest theory in the subject, and for better understanding the technological applications. An Instructor's Manual presenting detailed solutions to all the problems in the book is available from the Wiley editorial department.
