MAM—A Multipurpose Admittance Matrix for Antenna Design Via the Finite Element Method

Further exploitation of matrix-valued transfer functions describing electromagnetic phenomena is proposed. In addition to traditional modal port inclusion in finite element analysis, new computational domain ports are allowed as field expansion in terms of piecewise basis functions is considered. An admittance-type matrix arises and, as a result, a multiport network manages all electromagnetic complexity. Circuit handling of this network efficiently outperforms full-wave analyses for different modifications of the actual structure, thus, making it possible to use this methodology for design purposes. A model order reduction process is also used for fast frequency sweeping and special emphasis is placed on its accuracy. Finally, numerical examples demonstrate the robustness, capability and versatility of the proposed technique.