Chapter 5Applications
This chapter consists of various case studies and solutions of real-life electromagnetics problems using MLFMA. The topics are selected based on the authors' experiences on scattering from airborne targets, transmission through metamaterials and photonic crystals, scattering from RBCs, and radiation from log-periodic (LP) antennas and their arrays. Simulation results are presented to demonstrate the capabilities of electromagnetics solvers based on MLFMA.
5.1 Case Study: External Resonances of the Flamme
External resonances can be encountered when a scatterer involves a cavity and the cavity is excited appropriately. Those physical resonances lead to rapid changes in scattering characteristics of the target, which can be visible when electromagnetic fields are investigated with respect to frequency. For example, Figure 5.1 presents the bistatic RCS of the stealth airborne target Flamme [149] from 2 GHz to 11 GHz when the target is illuminated by a plane wave propagating at 140° angle from the nose. The plane wave is vertically polarized and both co-polar (VV) and cross-polar (VH) RCS are considered. It can be observed that the RCS values change rapidly around 7.9 GHz due to the resonance of the cavity located at the back of the Flamme.
Figure 5.1 (a) Co-polar and (b) cross-polar bistatic RCS of the Flamme from 2 GHz to 11 GHz. The target is illuminated ...
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