摘要:

A numerical solution for electromagnetic coupling to a perfectly conducting body of revolution with a loss-free homogeneous material region is developed here. The material region is exposed by a rotationally symmetric aperture in the conducting body. Application of the equivalence principle introduces an unknown electric current on the surface of the conducting body, and both an unknown equivalent electric current and an unknown equivalent magnetic current in the aperture. These currents satisfy the integral equations obtained by annihilating the tangential components of the electric field on the surface of the conducting body and by enforcing continuity of the tangential components of the electric and magnetic fields across the aperture. These integral equations are solved numerically by means of the method of moments.

ISSN:0272-6343    

DOI:10.1080/02726348208915169

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The purpose of the present work is the numerical modeling of partially buried vertical wire-antennas and scatterers. Our interest is in an efficient computation of their electromagnetic properties. Analytically the problem is formulated in terms of an integro-differential equation over the wire current across the air-ground interface. This equation is then converted into a numerically solvable form by means of Galerkin's method together with the piece-wise linear functions. The inverse Bessel transforms, commonly called Sommerfeld integrals, appearing in the Kernel of the integral equation have been evaluated by numerical integration over the real axis. The resulting computer code“STAKE,” which permits the numerical simulations of partially buried vertical wires, proved to be efficient and accurate in comparison with other computation methods. First the problem of antenna grounding has been investigated for the cases of soil and sea water. The current distributions, input admittances and radiation efficiencies are computed for various penetration depths of the wire into the ground. Second the scattering cross-sections are computed again for soil and sea water.

ISSN:0272-6343    

DOI:10.1080/02726348208915170

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

This paper explores some aspects of qualitative electromagnetic topology for system design. Sublayers are partitioned into sets for separate treatment in the design process. The concept of relative shielding order between pairs of sublayers is introduced and constraints on this non-negative-integer parameter are explored. Special cases are considered, including that of uniform relative shielding order between pairs of a set of sublayers designated primary sublayers.

ISSN:0272-6343    

DOI:10.1080/02726348208915171

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Scattering from several metallic objects having constrained current flow is measured. These objects consist of a series of loops so arranged as to form an equivalent cylinder. The wire diameter of the loops is approximately equal to the wall thickness of the cylinder. The measurements are compared with those of a hollow metallic cylinder. Additional measurements are presented for spherical objects, one having preferred current flow along the longitude and one having current constraint along the latitude. These are compared with solid sphere measurements.

ISSN:0272-6343    

DOI:10.1080/02726348208915172

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor