A Hybrid Technique Based on the Combination of Multilevel Fast Multipole Algorithm and the Geometrical Theory of Diffraction

<table>Geometrical model of Hispasat with an array of 3 × 3 conical horns.</table>

International Journal of Antennas and Propagation

Figure 3: A Hybrid Technique Based on the Combination of Multilevel Fast Multipole Algorithm and the Geometrical Theory of Diffraction 