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E - Bibliothèque et Archives Canada

E - Bibliothèque et Archives Canada

FIgun 2.5: Magnitude of

FIgun 2.5: Magnitude of surface current density (Ah) on the ahadow side of a haîf pîane illuminated by a TEr plane wave at 9û0(Using SOMMERFELD. FOR).

2.4 CHOEE OF AN INDEPENDENT METHOD FOR COMPARISON Whenever possible, the UTD soluti.ons in this wrk were compared to modal solutions, exact solutions and other approxirnate solutions found in the open literature. The moment rnethod solutions howiever were the main ones that were used. The moment method was chosen because it is a well established method and cornputer codes were creatd and customized for alrnost each UT0 case covered. The codes created used pulm basis fundions and point matching. This section will review quickly the moment tnethod formulation and describe two already existent independent moment rnethod codes that wsre usmi in addition to created codes. A will also explain why pulse basis fundons and point matching were chosen. In a typical scattering problem, the solution is the accurate predidion of the current density distributions on the surface of the scatterer. Radiation integrals are used aftenuards to cornpute radiated or scatîered fields. The prediction of current densities can be achieved by the integral equation method. The most popular equations are the electric field integral equation (EFIE) and the magnetic field integral equation (MFIE). The way they work is that the EFIE enforces the boundary condition on the surface of the pe-y electric conducüng scatterrer for the tangential electnc tield. Like wise the MFlE enforces the boundary condiaons on the tangential mgnaic field. In mis work only EFIEs wem ussd to mate moment method conputer dm, henœ only the €FIE wilt be covereâ beiow. Sinœ both T G and TMz polarkations are used, it is best to cover aie €FIE derivation for boai 2-0 polarization in hnio typical examples.

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