Generalized Transition Matrix Model Using Multilevel Characteristic Basis Function Method for Electrically Large Open-Ended Cavity Problems

This paper proposes an accelerated method for solving electrically large open-ended cavity problems by combining the generalized transition matrix (GTM) model with the multilevel characteristic basis function method (CBFM). The electric surface currents on the perfect electric conductor (PEC) surface are represented using characteristic basis functions (CBFs), which are precalculated through the multilevel CBFM. By reducing the number of unknowns, the computational cost for solving the problem is also reduced. This paper presents the formulation of the GTM model and multilevel CBFM, enabling efficient computation with lower computational complexity. Nu-merical simulation results are discussed, including comparisons with the commercial full-wave simulation, FEKO.