Radiation and Energy Storage Current Modes on Conducting Structures

The method of moments (MoM) impedance matrix is decomposed into three matrix operators related to stored energies and radiated power. The eigenvalue problems associated with each of these operators are solved in order to obtain three unique sets of modal currents and their corresponding eigenvalues. Projecting a general current into one of the three basis sets provides a convenient means of identifying currents which contribute to stored energies and radiated power. An electrically small antenna mounted to a larger ground plane is analyzed using these new methods.