Accelerated frequency interpolation of antenna impedances using characteristic modes

Characteristic mode theory can be a powerful tool in antenna analysis. Recent results have shown that each characteristic mode´s frequency response can be approximated by a template function related to the spherical mode that couples most of the power. By choosing the appropriate template function, the broadband frequency behavior of the characteristic modes can be modeled. Here we briefly outline an approach that uses this property in order to accelerate the interpolation of antenna impedances over a wide bandwidth.