Download or read book Dielectrically Loaded Biconical Antennas written by Fouad Nusseibeh and published by . This book was released on 1995 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 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 Resonance and Supergain Effects in Small Ferromagnetically Or Dielectrically Loaded Biconical Antennas written by Charles Polk and published by . This book was released on 1959 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The input impedance and the radiation pattern of thin biconical antennas which contain materials of high dielectric permittivity epsilon and high magnetic permeability mu can be evaluated by methods due to Schelkunoff and Tai. Examination of numerical results shows that resonances of the input impedance are obtainable for antenna lengths much shorter than that of the ordinary half-wave dipole. It becomes also apparent, however, that the impedance bandwidth at these resonances is narrow and decreases with increasing epsilon and mu. Analysis of the pertinent equations leads to the following conclusions concerning radiation patterns: (1) The pattern of an antenna which is small in terms of free-space wavelengths lambda and is also small in terms of material wavelengths, lambda/square root mu epsilon, is essentially that of a small current element in air; (2) If the biconical antenna is small in terms of free-space wavelengths, but is large in terms of material wavelengths the radiation pattern is also that of a small current element, except in certain well defined and very narrow frequency bands where multilobe or narrow lobe patterns appear. A similar 'supergain' effect has been noted by Knudsen in his discussion of small loops which carry currents of varying phase. (Author).

Download or read book Journal of Research written by United States. National Bureau of Standards and published by . This book was released on 1960 with total page 914 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 analysis of an aperture antenna system loaded with an inhomegenfous dielectric written by j. samuel bitler and published by . This book was released on 1967 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 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 Design of Dielectric Loaded Circumferential Slot Antennas of Arbitrary Size for Conical and Cylindrical Bodies written by and published by . This book was released on 1974 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A class of dielectric-loaded slot antennas designed to conform to the shape of various body structures is described. These antennas are flush with the body surface, and designed to occupy minimum space. The basic radiating structure is a low-loss dielectric-core substrate plated with a thin copper wall to form a dielectric-filled cavity. A circumferential radiating slot is in the outer surface of the cavity. The cavity is excited by an inductive post driven from a coaxial line. The conformal radiating slot can be designed in the surface of small or large dielectric structures and results in durable antennas that may operate in the UHF or microwave frequency regions. It is efficient, operates very well over a 10% bandwidth, and can be designed to produce many desired antenna patterns. Theory and experimental data on the different modes of radiation are discussed, along with the intrinsic characteristics of the selected dielectric materials. Design techniques, performance characteristics, and illustrations of a variety of prototype antennas are presented.

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 Antenna Theory and Practice written by Rajeswari Chatterjee and published by New Age International. This book was released on 1996 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Book Has Been Designed For Both The Undergraduate And Postgraduate In Electronic Engineering, Electrical Communication Engineering And Electrical Engineering, And For The Postgraduate In Physics Specialising In Electronics. It Is A Compact And Comprehensive Text And It Stresses The Basic Principles Of Antenna Theory And Practice. Starting With Electromagnetics And The Theory Of Radiation Which Forms The Basis Of Antenna Theory, It Treats In Detail Different Types Of Antennas Like The Linear Antenna, The Cylindrical Antenna, The Biconical Antenna, The Loop Antenna, The Helical Antenna, Slot And Microstrip Antennas, Horn Antennas, Reflector Antennas, Lens Antennas, Leaky Wave And Surface-Wave Antennas Including Dielectric And Dielectric Loaded Antennas, Wide Band Antennas And Some Modern Special Types Of Antennas.There Are Also Chapters On Antenna Synthesis, Antenna Practice, Antenna Measurements And Electromagnetic Wave Propagation. The Detailed Coverage Of Electromagnetic Theory Enables The Student To Understand The Theoretical Aspects With Comparative Ease. The Chapters On Antenna Synthesis, Antenna Practice And Antenna Measurements Are Useful For The Practical Antenna Engineer.The Problems At The End Of Chapters, Tables And Numerous Illustrations Add To The Value Of The Text. In This Second Edition A New Chapter On Antenna Impedance And Some Solved Problems Have Been Added. The Book Presupposes Only The Knowledge Of Mathematics Which A Student Of Undergraduate Engineering Or Undergraduate Physics Has Required.

Download or read book Radiation by Dielectric loaded Antennas with Airgaps written by Sabah Jawad Towaij and published by . This book was released on 1974 with total page 0 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 Reception and Transmission of Transient Electromagnetic Fields written by Hans J. Schmitt and published by . This book was released on 1963 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The receiving and transmitting properties of small linear antennas, conical antennas, and loops for transient electromagnetic fields were investigated experimentally. Short electrical dipoles loaded by a capacitance represented by a cathode follower can be used successfully for the measurement of transient fields with rise times of less than 1 nanosecond, if the first antenna resonance is suppressed by a series resistor at the base of the antenna. The currents induced on nonresonant structures by transient electromagnetic fields are investigated and their application to a direct measurement of the time sequence of the electromagnetic field is discussed. Signals with a simple and known time dependence such as a unidirectional pulse can be radiated into space if the reflection of current waves at discontinuities of the antenna structure is avoided. In a manner similar to that useful for the absorption of continuous waves in media with a stratified conductivity, it is shown that reflections at discontinuities can be avoided by dipoles with tapered resistive loading. (Author).

Download or read book Radiation by Dielectric loaded Antennas with Airgaps written by Towaij, Sabah Jawad and published by 1974.. This book was released on 1974 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Finite Element and Finite Difference Methods in Electromagnetic Scattering written by M.A. Morgan and published by Elsevier. This book was released on 2013-10-22 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second volume in the Progress in Electromagnetic Research series examines recent advances in computational electromagnetics, with emphasis on scattering, as brought about by new formulations and algorithms which use finite element or finite difference techniques. Containing contributions by some of the world's leading experts, the papers thoroughly review and analyze this rapidly evolving area of computational electromagnetics. Covering topics ranging from the new finite-element based formulation for representing time-harmonic vector fields in 3-D inhomogeneous media using two coupled scalar potentials, to the consideration of conforming boundary elements and leap-frog time-marching in transient field problems involving corners and wedges in two and three dimensions, the volume will provide an indispensable reference source for practitioners and students of computational electromagnetics.