Effective time domain analysis of periodic structures

In the paper we introduce a new approach to the analysis of periodic structures such as corrugated transmission lines or slow wave structures. It is based on the time domain simulation (FD-TD or TLM) of only one period, with a special type of boundary conditions modelling its behaviour in the entire structure. Two versions of the new method are considered. The first one utilizes complex notation in the phase constant domain while the other one reduces calculations to real numbers. We show how the new approach has been applied to several practical cases producing excellent results.