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Mapped vector basis functions for electromagnetic integral by Andrew F. Peterson

By Andrew F. Peterson

The method-of-moments answer of the electrical box and magnetic box fundamental equations (EFIE and MFIE) is prolonged to engaging in gadgets modeled with curved cells. those strategies are vital for electromagnetic scattering, antenna, radar signature, and instant communique purposes. Vector foundation capabilities of the divergence-conforming and curl-conforming forms are defined, and particular interpolatory and hierarchical foundation features are reviewed. approaches for mapping those foundation services from a reference area to a curved telephone, whereas conserving the specified continuity homes on curved cells, are mentioned intimately. For representation, effects are awarded for examples that hire divergence-conforming foundation features with the EFIE and curl-conforming foundation services with the MFIE. The meant viewers comprises electromagnetic engineers with a few past familiarity with numerical ideas.

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47, pp. 1244–1253, August 1999. 791939 [17] R. S. Preissig and A. F. , vol. 19, pp. 65–75, July 2004. cls December 28, 2005 19:49 53 C H A P T E R 4 Curl-Conforming Basis Functions Curl-conforming basis functions are complementary to the divergence-conforming functions discussed in Chapter 3. Here, curl-conforming functions are considered for square and triangular reference cells. The lowest order functions will be used to discretize the MFIE in Chapter 7. Tables of higher-order functions are included for completeness.

5: Portion of mesh and pointer indicating the cell-to-node connectivity. cls 24 December 28, 2005 19:41 MAPPED VECTOR BASIS FUNCTIONS face of the cell is inside or outside. For cells with relatively few nodes, a clockwise or counter-clockwise orientation of nodes around the cell center may be adequate for this purpose. For scalar problems (and especially in connection with scalar finite element solutions of differential equations), the cell-to-node connectivity is sufficient to describe the geometry of the structure.

Since there are only three edges per cell, it is possible to eliminate additional degrees of freedom compared to the basis functions for square cells, while ensuring that the divergence of the function is mathematically complete to the same degree as the basis function itself. Nedelec’s spaces require a total of ( p + 1)( p + 3) degrees of freedom for a representation of minimum degree p [5], with 3( p + 1) of those degrees of freedom contributing a nonzero normal component at the cell edges. 14).

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