THE IMPLEMENTATION OF TIME-DOMAIN DIAKOPTICS IN THE FDTD METHOD

The time-domain Diakoptics is implemented in the finite-difference tim e-domain (FDTD) method with two types of connecting interfaces: i) dir ectional interface (TLM-type), and ii) total-field interface (FDTD-typ e). The FDTD-type interface provides a more efficient way to realize t ime-domain Diakoptics than TLM, especially for device optimization pro blems. To emulate the TLM-type interface in FDTD, two novel algorithms are developed in this paper. One is to implement an ultra-wideband ab sorbing boundary on the excitation plane during excitation. The other is to separate directional waves without the knowledge of incident wav es. For a large circuit with cascaded modules, sequential and parallel algorithms are provided to connect them. With these connecting algori thms, time-domain Diakoptics is one candidate method to realize modula r and parallel computation in FDTD simulations. The validity of these algorithms is confirmed by comparison with simulated results from Micr owave SPICE.