Generalized Transition Matrix Model using Characteristic Basis Function Method for Open-ended Cavities

This paper proposes a novel method for addressing large open-ended cavity problems using the generalized transition matrix (GTM) method, accelerated by the characteristic basis function nethod (CBFM). The method employs characteristic basis functions (CBFs) to represent the electric surface currents on both the exterior and interior walls of the cavity, thereby reducing the number of unknowns. The paper introduces the formulation of the GTM model with CBFs, which enables efficient computation with lower computational complexity. Numerical results are presented using an example of an open-ended cavity structure, and computational efficiency is evaluated compared to conventional methods.