The singularity expansion method and its application to target identification

Article Abstract:

Singularity expansion method concepts are applied to aspect-independent target identification and discrimination since they represent electromagnetic interaction or scattering problems in singularities in the complex-frequency plane terms. E-pulse scheme feasibility for aircraft has been verified in the laboratory, but to be applied practically the design of optimal transmitting and receiving antennas and corresponding optimal waveforms must be investigated as well as the generation of high power electromagnetic impulses and the refinement of E-pulse synthesis. An array of antenna elements, such as tapered and resistively loaded dipoles, might increase beam steering abilities and two or more arrays might locate targets accurately. Some types of electromagnetic pulse sources are already available for generating high power impulses. Optimal E-pulse synthesis has not yet been developed.

Electromagnetic fields, Waveforms, Applications, Expansion, Transmission Lines, Quantitative Methods, Arrays

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Generalized impedance boundary conditions in scattering

Article Abstract:

Approximate boundary conditions (ABC) aim to simulate material properties of a finite body immersed in a homogeneous medium and illuminated by an electromagnetic field so they can be simulated through a local boundary condition that involves only the external fields imposed at the outer surface. This would convert a multiple media problem into a single medium problem. ABCs involve some risk since their presence is essential in problems that cannot be solved without implementing them. Several different conditions might be employed, and each condition might be derived by considering a canonical and solvable problem. The ABC is an effective tool for the analytical and numerical solution of scattering problems. When the weights of field derivatives up to the Nth order are adjusted, many reflecting surfaces can be simulated.

Multivariate analysis, Geometry, Electromagnetic radiation, Wave propagation, Materials Analysis, Solvability

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