The MLFMA Equipped with a Hybrid Tree Structure for the Multiscale EM Scattering

<table>Two kinds of the bottom-layer boxes. For example, each purple or black box is a bottom-layer box in the octree structure, while each blue box is a bottom-layer box in the 27-tree structure.</table>

International Journal of Antennas and Propagation

fig1

Figure 1

Figure 1: The MLFMA Equipped with a Hybrid Tree Structure for the Multiscale EM Scattering 