Modeling irregular boundary with transmission-line modeling method

This work proposes a model to represent internal and external fractional boundary nodes without increasing the computational time and memory comparing to other techniques. The limiting effects on the simulation time steps are the same of the basic transmission-line nodes. This model is also indicated for parallel processing, once it does not produce branching in the algorithm stream. The processing time is the same as a basic transmission-line modeling (conventional TLM) mesh independent of the boundary complexity. The accuracy is higher than the one obtained with the basic TLM (full nodes). This model is suitable for hybrid and general TLM symmetrical condensed nodes. Validations are made against analytical results, numerical TLM results (conventional TLM), and other published results. (C) 2012 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2013.