Radiation characteristics of a slot antenna on a conducting prolate spheroid

1995 ◽  
Vol 73 (5-6) ◽  
pp. 376-385 ◽  
Author(s):  
M. Zhang ◽  
A. A. Sebak
Keyword(s):  
Prolate Spheroid ◽  
Wave Functions ◽  
Slot Antenna ◽  
Published Data ◽  
System Of Equations ◽  
Prolate Spheroidal ◽  
Radiation Characteristics ◽  
Vector Wave ◽  
Slot Length ◽  
Expansion Coefficients

In this paper, the radiation characteristics of an asymmetrical slot antenna on a conducting prolate spheroid are considered. The radiated fields are expanded in terms of prolate-spheroidal vector wave functions. The unknown expansion coefficients are determined by a system of equations derived from the boundary conditions. Numerical results for radiation patterns and conductance are obtained and compare well with published data for a slotted sphere. The effect of the slot length and the shape of the spheroid on the magnitude of the radiated field and radiation conductance is also presented.

scholarly journals Two-Dimensional Scattering by a Homogeneous Gyrotropic-Type Elliptic Cylinder

2016 ◽  
Vol 5 (3) ◽  
pp. 106
Author(s):  
A. K. Hamid ◽  
F. Cooray
Keyword(s):  
Cross Sections ◽  
Plane Electromagnetic Wave ◽  
Separation Of Variables ◽  
Elliptic Cylinder ◽  
Wave Functions ◽  
Two Dimensional ◽  
Vector Wave ◽  
Expansion Coefficients ◽  
Scattering Cross Sections ◽  
Uniform Plane

The separation of variables procedure has been employed for solving the problem of scattering from an infinite homogeneous gyrotropic-type (G-type) elliptic cylinder, when a uniform plane electromagnetic wave perpendicular to its axis, illuminates it. The formulation of the problem involves expanding each electric and magnetic field using appropriate elliptic vector wave functions and expansion coefficients. Imposing suitable boundary conditions at the surface of the elliptic cylinder yields the unknown expansion coefficients related to the scattered and the transmitted fields. To demonstrate how the various G-type materials and the size of the cylinder affects scattering from it, plots of scattering cross sections are given for cylinders having different permittivity/permeability tensors and sizes.

On the Inverse Problem of Scattering from a Perfectly Conducting Prolate Spheroid

1972 ◽  
Vol 50 (8) ◽  
pp. 754-759 ◽  
Author(s):  
F. H. Vandenberghe ◽  
W. M. Boerner
Keyword(s):  
Inverse Problem ◽  
Electromagnetic Scattering ◽  
Scattered Field ◽  
Spherical Wave ◽  
Prolate Spheroid ◽  
Wave Functions ◽  
Prolate Spheroidal ◽  
Spheroidal Wave Functions ◽  
Prolate Spheroidal Wave Functions ◽  
Model Technique

The inverse problem of electromagnetic scattering from a prolate spheroidal scatterer is considered. The approach is based on the model technique presented in Boerner and Vandenberghe, conjecturing that the salient features of the scatterer can be determined from the far scattered field via matrix inversion. An expansion in spherical wave functions for the scattered field based on the formulation of Senior is employed instead of an expansion in prolate spheroidal wave functions. It is then shown that the characteristic parameters of the ellipse generating the prolate spheroid (the interfocal distance d and the eccentricity ε) can be directly recovered from Senior's expansion coefficients.

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