John Shaeffer

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This paper presents three techniques and the graphics implementations which can be used as diagnostic aides in the design and understanding of scattering structures: Imaging, near fields, and surface current displays. The imaging analysis is a new bistatic k space approach which has potential for much greater information than standard experimental(More)
  • John Shaeffer
  • 2015
This paper shows a frequency domain Method of Moments scattering code where spatial unknown grouping has led to low rank blocks in the system matrix and thus enabled use of the Adaptive Cross Approximation to very significantly increase the problem sizes doable on PC Workstations. Example scattering results are shown for three geometries ranging from(More)
Recent work on sparse MOM codes for PC applications has reduced LU matrix factorization time to significantly less than matrix fill for problem unknowns approaching 200,000. This paper reports on the use and results of applying the recently developed adaptive cross approximation for significantly reducing MOM matrix fill time. Results suggest that when(More)
This paper presents a case study of a simple yet robust target for demonstration of the EM visualization process. A five lambda square plate exhibits many scattering mechanisms depending on excitation angle and polarization: specular scattering, leading and trailing edge diffraction, traveling wave, and edge wave scattering. Bistatic k space radiation(More)
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