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Author : Hermann W. Ehrenspeck
Publisher : Unknown
Page : 10 pages
File Size : 44,7 Mb
Release : 1965
Category : Antennas (Electronics)
ISBN : UOM:39015095127612
Author : Francis J. Zucker
Publisher : Unknown
Page : 8 pages
File Size : 42,6 Mb
Release : 1966
Category : Antennas (Electronics)
ISBN : UOM:39015095129113
Author : Hermann W. Ehrenspeck
Publisher : Unknown
Page : 24 pages
File Size : 46,9 Mb
Release : 1967
Category : Antennas (Electronics)
ISBN : UOM:39015095128719
The backfire antenna described combines the structural advantages of a single endfire with the high gain of a reflector antenna. With its principal application in the gain range between 15 and 30 dB where ordinary endfire antennas become impractically long and paraboloidal antennas too expensive, it should prove to be especially advantageous for telemetry and radio astronomy applications in the 100- to 2000-MHz frequency range. The high gain of the backfire is based on the high-amplitude standing-wave field distribution formed between two planar reflectors. The space between the reflectors acts like an open resonating cavity that in basic configuration and function resembles a Fabrey-Perot laser cavity. An S-band model of a 4.0-wavelength backfire produces a gain of 23.5 dB at its optimum frequency, which corresponds to the gain of an equal-size paraboloidal antenna of 60% efficiency. Patterns show a very low side- and backlobe level over a frequency range of 1.25 to 1. Design information for these backfire antennas is given. Compared with an optimized equal-length Yagi, the backfire antenna produces an increase in gain of more than 8 dB. To achieve a gain of this magnitude with an ordinary array, one of two recently built antennas for satellite applications uses 16 Yagis, each 2.0 wavelength long, to produce a gain of 22.4 dB, and another uses 36 cavity-backed slots to produce 21.2 dB. These results emphasize the advantages of the single-element backfire antenna, whose 23.5 dB gain is achieved through a simple structural design that does not depend on the complicated feed systems that are necessary components in multielement arrays. (Author).
Author : Hermann W. Ehrenspeck
Publisher : Unknown
Page : 12 pages
File Size : 52,9 Mb
Release : 1965
Category : Antennas (Electronics)
ISBN : UOM:39015095127919
Author : J. A. Strom
Publisher : Unknown
Page : 36 pages
File Size : 47,5 Mb
Release : 1969
Category : Antenna radiation patterns
ISBN : UOM:39015095133016
A backfire antenna is described which incorporates a dielectric slow-wave structure in place of the parasitic directors of earlier models. Using previously investigated optimum dimensions, this antenna uses new techniques of energizing in a cross polarized sense. Measurements of far-field patterns, directivity, and isolation between primary planes are given. (Author).
Author : Hermann W. Ehrenspeck,John A. Strom
Publisher : Unknown
Page : 24 pages
File Size : 41,7 Mb
Release : 1971
Category : Antenna arrays
ISBN : UOM:39015095290824
The short backfire (SBF) antenna consisting of a large reflector illuminated by a dipole feed and smaller disk reflector produces a gain of 15 dB above isotropic. As an array element it has been efficiently adapted for various configurations of high-gain antennas producing gains of up to 25 dB, with a single SBF element capable of replacing four to six elements of a conventional multidipole array. Farfield patterns and directivity measurements are presented for a single element and for a twin element mounted on a common reflector. Optimized dimensions for both cases are discussed for possible application to more complex types of antennas.
Author : Alan W. Rudge
Publisher : IET
Page : 726 pages
File Size : 48,5 Mb
Release : 1982
Category : Science
ISBN : 0906048826
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.
Author : R. A. Burberry
Publisher : IET
Page : 318 pages
File Size : 46,9 Mb
Release : 1992
Category : Technology & Engineering
ISBN : 0863412696
Describes the VHF and UHF antennas for the 30-3000 Mhz range that have been developed over the past 50 years, including many designs that have not previously been treated in detail, and several new uses for old designs. Among the topics are methods of predicting and measuring the performance of antennas, and how it is affected by the local environment, both normal and adverse, and by the structures on which the antennas are mounted, both fixed and mobile (including humans). Addressed primarily to practicing antenna engineers; the basic theory is assumed to be known except for the less known types. Distributed by INSPEC. Annotation copyright by Book News, Inc., Portland, OR
Author : Hermann W. Ehrenspeck
Publisher : Unknown
Page : 42 pages
File Size : 43,9 Mb
Release : 1974
Category : Antenna arrays
ISBN : UOM:39015095306489
Eight short backfire (SBF) elements aligned on a common planar reflector form a highly efficient fan-beam array capable of yielding a maximum gain of approximately 24 dB. The influence of parameter variations on the array patterns and directivity was experimentally determined by varying the frequency. Normalized design parameters for highest efficiency and for circular polarization capability are tabulated. All array dimensions are given in wavelengths so that each application can easily be scaled for any desired frequency.
Author : Tsing-zone Hsieh
Publisher : Unknown
Page : 498 pages
File Size : 52,7 Mb
Release : 1971
Category : Antennas (Electronics)
ISBN : MSU:31293030829240
Author : Anonim
Publisher : Unknown
Page : 240 pages
File Size : 54,5 Mb
Release : 1966
Category : Aeronautical instruments
ISBN : CHI:62485030
Author : J. C. Brown
Publisher : Elsevier
Page : 566 pages
File Size : 40,9 Mb
Release : 2013-10-22
Category : Science
ISBN : 9781483185927
Electromagnetic Wave Theory, Part 2 contains the proceedings of a Symposium on Electromagnetic Wave Theory held at Delft, The Netherlands in September 1965. The symposium provided a forum for discussing electromagnetic wave theory and tackled a wide range of topics, from propagation in nonlinear media to electromagnetic wave propagation and amplification in solid-state plasmas. Electromagnetic waves in nonlinear transmission lines with active parameters are also considered, along with the phase dependence of maser active material Q-factor on pump intensity and frequency. Comprised of four sections, this volume begins with an analysis of two modes of propagation that are coupled through parametric modulation in nonlinear media. The discussion then turns to symmetry restrictions in nonlinear, non-absorbing, non-dispersive media; nonlinear interaction between two beams of plane electromagnetic waves in an anisotropic medium; radiation in periodically non-stationary media; and electromagnetic wave propagation in time-varying media. Subsequent chapters explore the diffraction of electromagnetic waves by plasma structures; resonant electromagnetic scattering from gyrotropic plasmas; scattering and transmission of electromagnetic waves at a statistically rough boundary between two dielectric media; and developments in wavefront reconstruction. This book will be useful for students, practitioners, and researchers in physics.
Author : Anonim
Publisher : Unknown
Page : 276 pages
File Size : 50,5 Mb
Release : 1967
Category : Aeronautics, Military
ISBN : UOM:39015026745342
Author : Anonim
Publisher : Unknown
Page : 252 pages
File Size : 46,5 Mb
Release : 1967
Category : Aeronautics
ISBN : CORNELL:31924004399394
Author : Anonim
Publisher : Unknown
Page : 20 pages
File Size : 52,8 Mb
Release : 1969
Category : Research
ISBN : MINN:30000010503682