EMAP (ElectroMagnetic Analysis Program) is a family of three-dimensional finite element modeling codes that can be used to analyze simple 3-dimensional geometries. The EMAP codes are relatively easy to learn to use and are distributed in source code form.
The EMAP codes are not intended to compete with commercial finite element modeling codes. They do not have a sophisticated mesh generator, graphical output, or unlimited technical support. Their primary strengths are ease-of-use, modest resource requirements, and accurate modeling of simple three-dimensional configurations over a wide range of frequencies.
EMAP1 employs a variational formulation described by Maile [1]. EMAP-2 employs the Galerkin finite element formulation described in papers by Paulsen and Lynch [2,3]. Both EMAP1 and EMAP2 are scalar (node-based) codes. EMAP1 is a good choice of codes for instructors that wish to illustrate "spurious modes", which are often a problem with scalar full-wave finite element codes [4]. The formulation applied in EMAP2 does not exhibit spurious modes [5]. EMAP3 is a vector (edge element) code. Vector codes are generally not affected by spurious modes and have other inherent advantages. All of the EMAP codes are written in the C programming language and can be compiled and run on PCs, workstations, or mainframes.