  This paper presents a new method, based on the well-known method of moments
(MoM), for the numerical electromagnetic analysis of scattering and radiation
from metallic or dielectric structures, or both structure types in the same
simulation, that are in contact with other metallic or dielectric structures.
The proposed method for solving the MoM junction problem consists of two
separate algorithms, one of which comprises a generalization for bodies in
contact of the surface integral equation (SIE) formulations. Unlike some other
published SIE generalizations in the field of computational electromagnetics,
this generalization does not require duplicating unknowns on the dielectric
separation surfaces. Additionally, this generalization is applicable to any
ordinary single-scatterer SIE formulations employed as baseline. The other
algorithm deals with enforcing boundary conditions and Kirchhoff's Law,
relating the surface current flow across a junction edge. Two important
features inherent to this latter algorithm consist of a mathematically compact
description in matrix form, and, importantly from a software engineering point
of view, an easy implementation in existing MoM codes which makes the debugging
process more comprehensible. A practical example involving a real grounded
monopole antenna for airplane-satellite communication is analyzed for
validation purposes by comparing with precise measurements covering different
electrical sizes.
