Simulation of finite cavity-backed antenna arrays using an accelerated FE-BI method

In this paper, we propose an efficient simulation technique for the finite cavity-backed antenna arrays. The proposed method is based on the finite element-boundary integral (FE-BI) method accelerated by the adaptive integral method (AIM). The finite element method (FEM) enables the modeling of anisotropic, inhomogeneous materials inside the cavity, while AIM is introduced for the efficient calculation of the time-consuming boundary integrals at the cavity aperture. The coaxial feeds at the bottom of the cavity are modeled accurately using the eigenfunction expansion (EE) method. Numerical examples are presented to show the feasibility and efficiency of the proposed simulation method