Electromagnetic Scattering from Two Dimensional Objects Using the Field Feedback Formulation
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Integral equations IEs are widely utilized to calculate induced currents on antennas and scatters, but they are seriously restricted in their ability to handle inhomogeneous penetrable structures having multiwavelength dimensions. The utilization of finite element FE techniques has not been as pervasive as the use of IEs. The IE representation matrix is full, containing few, if any, zero valued elements. The techniques for operating on these large- sized full matrices require undesirable amounts of processor time. FE techniques produce sparse matrices due to the strictly local interactions between discrete unknowns. The application of FEs to unbounded problems, however, requires supplementary enforcement of the far-field radiation conditions. The Field Feedback Formulation FFF circumvents the full-matrix computational bottleneck by allowing FE based numerical methods to be employed. Even though the resultant spare matrices may be larger than the full matrices discussed earlier, most elements have a value of zero. Numerical procedures exist to optimize operations with these sparse matrices. Calculational speeds can be orders of magnitude faster. Computer technique to implement and validate this new technique are the basic for this thesis. Excellent agreement with classical results are demonstrated. Theses.
- Electrical and Electronic Equipment
- Computer Programming and Software
- Electricity and Magnetism
- Radiofrequency Wave Propagation