EIGER: Electromagnetic Interactions GEneRalized

EIGER (Electromagnetic Interactions GEneRalized), a single integrated software tool set, brings together a variety of spectral domain analysis methods. These include moment method solutions of integral equation formulations and finite elements solutions of partial differential equations. New software engineering methods, specifically, object oriented design, are being used to implement abstractions of key components of spectral analysis methods so that the tools can be easily modified and extended to treat new classes of problems. The key components of the numerical analysis tool, and their roles, are: elements-to describe the geometry, basis functions-to interpolate the unknowns (e.g., fields) locally, and operators-to express the underlying physics formulations used to propagate the energy or enforce fundamental principals. The development of EMPACK by Yesantharao (1989) provided the fundamental impetus for these abstractions which are discussed.