Analysis of nonlinearly loaded antennas excited by an electromagnetic fast transient pulse: a MoM-AOM Approach

A frequency-domain spectral balance technique is utilized in this paper to analyse orientation effects on the performance of a non-linearly loaded antenna located over a lossy dielectric half-space. The technique involves two stages. First, the problem is transformed to a nonlinear microwave equivalent circuit with the circuit parameters of antenna extracted by the method of moments (MoM) solution of the electric field integral equation (EFIE). Then, the arithmetic operator method (AOM) is applied to solve the nonlinear microwave equivalent circuit. The main feature of the proposed technique is its efficiency in analyzing the transient response of the antenna with strong nonlinear loads over a lossy dielectric half-space. The technique works purely in the frequency domain, so the effects of lossy dielectric half-space can be considered properly by using method of moment in conjunction with Sommerfeld asymptotic method.