Computational Electromagnetics and Its Applications by L. N. Medgyesi-Mitschang (auth.), Thomas G. Campbell, R. A.

By L. N. Medgyesi-Mitschang (auth.), Thomas G. Campbell, R. A. Nicolaides, Manuel D. Salas (eds.)

This quantity comprises the court cases of the 1st ICASE/LaRC paintings­ store on Computational Electromagnetics and Its purposes performed by way of the Institute for desktop purposes in technological know-how and Engineering and NASA Langley learn heart. We had a number of ambitions in brain after we made up our minds, together with the Elec­ tromagnetics study department, to arrange this workshop on Computa­ tional Electromagnetics ( CEM). between our pursuits have been a wish to receive an outline of the present nation of CEM, protecting either algorithms and ap­ plications and their impression on NASA's actions during this region. furthermore, we would have liked to supply an enticing environment for computational scientists with services in different fields, particularly computational fluid dynamics (CFD), to watch the algorithms and instruments of CEM at paintings. Our expectation was once that scientists from either fields may notice jointly useful inter­ connections and relationships. one other target used to be to profit of growth in resolution algorithms for electromagnetic optimization and layout difficulties; such difficulties make wide use of box solvers and computational effi­ ciency is at a top class. to accomplish those targets we assembled the well known staff of audio system from academia and whose talks are contained during this quantity. The papers are published within the similar order within which the talks have been pre­ sented on the assembly. the 1st paper is an summary of labor at present being played within the Electromagnetic learn department on the Langley study Center.

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Vis the volume of the cavity. Sap is the aperture surface in the infinite ground plane and Sinp is the common surface between input feed line and the cavity as shown in figure 14. T is the vector testing function. Hap is the magnetic field over the aperture Sap and Hinp is the magnetic field over the surface Sinp· n is the unit surface normal pointing out of the volume. Lr and Er OVERVIEW OF EM RESEARCH 31 are the relative permeability and relative permittivity of the medium in the cavity, respectively, and k 0 is the free space wave number.

30 150 100 +=00 ~ 50 0 50 100 150 (a) Eo Polarization ....... 0 I1 -20 j I I I ,,I I~ , FEM/MoM/GlD Measured \ '~· _, ,~ . \ I I :a z8 ------ ~180° ... 100 50 ~00 ~ 0 50 100 9(degs) (b) Et/J Polarization Figure 16. ' \ \ I I I I I -60 ,,. \ I -40 \ Radiation patterns of spiral antenna (figure 15) at 4GHz. 00 Figure 17. 1GHz. frequency domain techniques, however, is the computational cost involved in obtaining the solutions over a frequency range. Computations have to be repeated for each frequency to obtain the complete frequency response over a frequency range.

9. 10. 11. 12. 13. 14. 15. Storaasli, 0. : Performance of NASA equation solvers on computational mechanics applications, American Institute of Aeronautics and Astronautics ( AIAA) Paper No. 96-1505, (April 1996). Rao, S. , Wilton, D. , and Glisson, A. : Electromagnetic scattering by surfaces of arbitrary shapes, IEEE Trans. on Antennas and Propagation AP-30 (May 1982), 409-418. Sarkar, T. : Electromagnetic scattering from dielectric bodies, IEEE Trans. on Antennas and Propagation AP-37(5) (May 1989), 673-676.

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