Domain decomposition FDTD algorithm for the analysis of electromagnetic fields and microwave structures

In this paper, a universal and efficient algorithm of domain decomposition finite difference time domain (DD-FDTD) is presented for the analysis of electromagnetic fields and microwave structures. The proposed algorithm can not only be used to analyze very complicated microwave structures but also be used to analyze sparse multi-domain electromagnetic fields. The algorithm can greatly increase the accuracy of numerical simulations and save computation time and memory space. Moreover, by combining the DD-FDTD method with a numerical thru-line (TL) calibration technique, an efficient hybrid algorithm is developed for the accurate parameter extraction of microwave circuits and structures, such as substrate integrated circuits (SICs). The SICs that are studied in this work are based on substrate integrated waveguides (SIW) which are useful for the design of millimeter-wave planar circuits such as filters, resonators and antennas.