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Asymmetrically Excited Electromagnetic Radiation from Circular Cylinders of Finite Length and Prolate Spheroids

Kuehl, Hans H. (1959) Asymmetrically Excited Electromagnetic Radiation from Circular Cylinders of Finite Length and Prolate Spheroids. Caltech Antenna Laboratory Technical Report, 19. California Institute of Technology , Pasadena, CA. (Unpublished)

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The far zone radiation from two types of asymmetrically excited systems is considered. The first is a finite cylinder excited by an electric dipole in the radial direction near the cylinder. The second is a prolate spheroid excited by a narrow belt of electric field around the surface of the spheroid. In both cases the body considered is perfectly conducting and the excitation is not necessarily centered at the midplane of the body. In the case of the finite cylinder excited by a radial dipole, an approximate method is used in which the current on the finite cylinder is taken to be identical with the current which would exist on an infinite cylinder under the same excitation. This approximation is shown to be valid analytically and experimentally if the cylinder is not short. The analytic and experimental results are compared for two cylinder lengths. The turnstile antenna mounted on a finite cylinder is considered analytically and the modification of the radiation by the cylinder is exhibited. In the case of the prolate spheroid excited by a narrow belt of electric field, experimental results are compared to analytic expressions. The differences between the experimental and analytic results are considered. The considerations in obtaining accurate experimental results in both asymmetrically excited systems are discussed.

Item Type:Report or Paper (Technical Report)
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Additional Information:Research supported by the U. S. Air Force Office of Scientific Research. The author wishes to express his indebtedness to Professor C. H. Papas for his guidance and encouragement throughout the course of this research. The author is grateful to Dr. C. P. Wells of Michigan State University for the use of the computed results of the asymmetrically fed spheroidal antenna. Thanks are due to Mr. Cavour Yeh for valuable assistance with the computational and experimental portion of this research, to Miss Adelheid A. Hohenlohe for the preparation of the figures, and to Mrs. Ruth Stratton for the typing of the text. The author acknowledges the Western Data Processing Center at the University of California at Los Angeles for the use of the computing facilities.
Group:Caltech Antenna Laboratory
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Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
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ASTIAAD 217 182
Series Name:Caltech Antenna Laboratory Technical Report
Issue or Number:19
Record Number:CaltechAUTHORS:20191125-160606483
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100051
Deposited By: Melissa Ray
Deposited On:26 Nov 2019 20:01
Last Modified:26 Nov 2019 20:30

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