Campus 3: Methode De Francais FRENCH by Jacques Pecheur; Edvige Costanzo; Muriel Molinie

By Jacques Pecheur; Edvige Costanzo; Muriel Molinie

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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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