Improved Programs for Analysis of Radiation and Scattering by Configurations of Arbitrarily Bent Thin Wires PDF Download
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Author: Dah-Cheng Kuo
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 54
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Book Description
Improved user-oriented computer programs are presented and described for analyzing the electromagnetic behavior of arbitrarily bent thin-wire antennas and scatterers. A given problem can involve several wires of different shapes and radii and the wires can be excited or loaded at arbitrary points along their lengths. Matrix methods are used with the method of moments to compute various quantities of engineering interest. For radiation problems these include current distributions, input impedances, and specified far-field patterns and near-field distributions. For scattering problems the current is again calculated along with specified scattered field and bistatic radar cross-section patterns. Particular emphasis is given to required data input, and illustrative examples are included. (Author).
Author: Dah-Cheng Kuo
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 54
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Book Description
Improved user-oriented computer programs are presented and described for analyzing the electromagnetic behavior of arbitrarily bent thin-wire antennas and scatterers. A given problem can involve several wires of different shapes and radii and the wires can be excited or loaded at arbitrary points along their lengths. Matrix methods are used with the method of moments to compute various quantities of engineering interest. For radiation problems these include current distributions, input impedances, and specified far-field patterns and near-field distributions. For scattering problems the current is again calculated along with specified scattered field and bistatic radar cross-section patterns. Particular emphasis is given to required data input, and illustrative examples are included. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1572
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Book Description
Author: Bradley J. Strait
Publisher:
ISBN:
Category : Antenna radiation patterns
Languages : en
Pages : 80
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Book Description
Author: Bradley J. Strait
Publisher:
ISBN:
Category : Antenna arrays
Languages : en
Pages : 40
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Book Description
Author: Tapan K. Sarkar
Publisher:
ISBN:
Category : Antenna arrays
Languages : en
Pages : 80
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Book Description
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.
Author: Tapan K. Sarkar
Publisher:
ISBN:
Category : Antenna arrays
Languages : en
Pages : 36
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Book Description
A user oriented computer program is presented and described for analyzing radiation from linear arrays of parallel horizontal thin-wire antennas over the surface of an imperfectly conducting earth. The program is equipped to treat unequally spaced arrays of wires that can be of different lengths and radii, but it is assumed the wires are all centerfed. The wires are assumed to be unloaded and that the conductivity of the earth is finite. The effects of the imperfectly conducting earth are accounted for approximately by using the method of reflection coefficients. Computed output consists of current distributions, input impedances, and far-field patterns specified by the user.
Author: Herndon H. Jenkins
Publisher: Artech House Radar Library (Ha
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 264
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Book Description
Operating principles - Performance difinition - Direction-finding error sources - System level descriptions - Representative operational small-aperture - Passive geolocation - Subsystem considerations - Calibration and test of direction-finding systems.
Author: J. Moore
Publisher: John Wiley & Sons
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 432
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Book Description
This monograph documents the experience to date of three groups who, working in the UK Ministry of Defense during the past decade, have sought to develop and apply the Method of Moments to the solution of realistic problems in electromagnetic scattering and radiation. Applications form the main part of the text. Describes extensions and modifications of the methods. Much of the material has not previously been published.
Author: F. M. Landstorfer
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 200
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Book Description
After discussing the phenomenon of wave detachment and radiation within the nearfield of wire antennas in terms of fieldlines, instantaneous and time-average energy flow and Poynting vector ellipses, a new equivalent circuit is introduced which helps to describe and optimize short radiators. Numerical methods for shaping wire antennas for maximum performance are given. Parameters to be optimized are, for example, directivity and effective length. Numerous results for single and split-wire antennas with and without reflector, offering directivities ranging from 7 to 16 db, are presented. The results are also discussed in terms of nearfield properties. Methods for optimizing a combination of performance parameters such as directivity, sidelobe level and impedance are then presented, and results given. Arrays of these optimally shaped elements are combined in new backfire, Yagi-uda and LP antennas which offer surprising properties.
Author:
Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 132
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Book Description
