Application of on-surface MEI method on wire antennas

The on-surface measured equation of invariance method (OSMEI) is applied to analyze the wire antennas for the first time. The unknowns of each node on the antenna surface are expressed by the vector potential function and surface current density. The unknowns in the vicinity of each node are coupled in a linear equation, and the coefficients are determined by the MEI method. The impedance matrix obtained by the OSMEI is a highly sparse matrix. Criterion to select the metrons is also discussed which is helpful to obtain robust results. Samples show that the approach presented in this paper makes it possible to obtain accurate results with little time-consumption for wire antenna problems.