Electromagnetic Scattering by a Transversely Moving Conducting Cylinder of Arbitrary Cross Section

1973 ◽  
Vol 51 (7) ◽  
pp. 699-706 ◽  
Author(s):  
J. D. Hunter
Keyword(s):  
Cross Section ◽  
Current Density ◽  
Computational Efficiency ◽  
Electromagnetic Scattering ◽  
Surface Current ◽  
Incident Field ◽  
Arbitrary Cross Section ◽  
Numerical Calculations ◽  
Surface Current Density ◽  
Conducting Cylinder

A method of calculating the electromagnetic scattering from a transversely moving conducting cylinder of arbitrary cross section is derived in terms of the surface current density on the cylinder, with a particular view to computational efficiency. It is shown that the required numerical calculations are only slightly more complicated than those for a stationary cylinder. Results are presented for a transversely moving conducting triangular cylinder for both TM and TE polarizations of the incident field.

Electromagnetic Scattering by a Moving Conducting Cylinder of Arbitrary Cross Section

1973 ◽  
Vol 51 (22) ◽  
pp. 2389-2394 ◽  
Author(s):  
J. D. Hunter
Keyword(s):  
Cross Section ◽  
Electromagnetic Scattering ◽  
Incident Field ◽  
Arbitrary Cross Section ◽  
Square Cylinder ◽  
Field Source ◽  
Conducting Cylinder ◽  
Arbitrary Velocity

A method is derived for calculating the electromagnetic scattering from a conducting cylinder of arbitrary cross section moving with arbitrary velocity relative to the field source and the observer. Results are presented for a moving square cylinder for both TM and TE polarizations of the incident field.

scholarly journals Radar Cross-Section Formulation of a Shell-Shaped Projectile Using Modified PO Analysis

2012 ◽  
Vol 2012 ◽  
pp. 1-9
Author(s):  
Mohammad Asif Zaman ◽  
Md. Abdul Matin
Keyword(s):  
Differential Geometry ◽  
Cross Section ◽  
Current Density ◽  
Surface Current ◽  
Radar Cross Section ◽  
Analysis Procedure ◽  
Physical Optics ◽  
Surface Current Density ◽  
Filtering Method ◽  
Good Agreement

A physical optics based method is presented for calculation of monostatic Radar Cross-Section (RCS) of a shell-shaped projectile. The projectile is modeled using differential geometry. The paper presents a detailed analysis procedure for RCS formulation using physical optics (PO) method. The shortcomings of the PO method in predicting accurate surface current density near the shadow boundaries are highlighted. A Fourier transform-based filtering method is proposed to remove the discontinuities in the approximated surface current density. The modified current density is used to formulate the scattered field and RCS. Numerical results are presented comparing the proposed method with conventional PO method. The results are also compared with published results of similar objects and found to be in good agreement.

ELECTROMAGNETIC SCATTERING FROM CYLINDERS OF ARBITRARY CROSS‐SECTION IN A CONDUCTIVE HALF‐SPACE

Geophysics ◽  
1971 ◽  
Vol 36 (1) ◽  
pp. 67-100 ◽  
Author(s):  
J. R. Parry ◽  
S. H. Ward
Keyword(s):  
Half Space ◽  
Cross Section ◽  
Electromagnetic Scattering ◽  
Numerical Technique ◽  
Surface Current ◽  
Arbitrary Cross Section ◽  
Integral Representations ◽  
Radius Of Curvature ◽  
Current Densities ◽  
Conducting Cylinders

A general numerical technique is presented for solving the problem of electromagnetic scattering by conducting cylinders of arbitrary cross‐section located in a conductive half‐space. Solutions to the electromagnetic wave equation are required for the free space above the half‐space, for the half‐space surrounding the cylinder, and for the cylinder. The problem is formulated by choosing an integral representation for the electromagnetic fields in each of the three homogeneous regions. By enforcing the boundary conditions on tangential E and H, we obtain a set of coupled integral equations which can be solved numerically for the unknown equivalent surface current densities on the interface bounding each homogeneous region. Once these current densities have been estimated, the fields can be calculated at any point from the general integral representations. The following conclusions are among those of importance to AFMAG and VLF surveys: 1) the ratio of Re (H) to Im (H) is a function of traverse position and of ground conductivity, as well as of cylinder conductivity and of survey frequency; 2) in no case was a zero phase observed, even for perfectly conducting cylinders; and 3) reverse crossovers in Im (H) can occur in the field scattered by a single conductor whenever the radius of curvature on the upper portion of a “poor” conductor is small.

Surface Current Density on Perfectly Conducting Polygonal Cylinders

1972 ◽  
Vol 50 (2) ◽  
pp. 139-150 ◽  
Author(s):  
J. D. Hunter
Keyword(s):  
Boundary Condition ◽  
Current Density ◽  
Fourier Coefficients ◽  
Surface Current ◽  
Axial Direction ◽  
Incident Field ◽  
Surface Current Density ◽  
Cylindrical Waves ◽  
Edge Conditions ◽  
Uniqueness Of The Solution

A method is presented of obtaining numerically the surface current density on a perfectly conducting regular or irregular polygonal cylinder when the incident field is either electrically or magnetically polarized (TM or TE) in the axial direction. The surface current density is represented by a sum of continuous modal functions and satisfies the edge conditions. The extended boundary condition is satisfied and the uniqueness of the solution ensured by setting to zero each of the Fourier coefficients of the field around a circle inside the cylinder. Results are presented for a regular triangular cylinder symmetrically illuminated by plane and cylindrical waves.

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