Comparison of various full-wave methods in calculating the RCS of inlet

Radar cross section (RCS) is a very important measure in the field of radar stealth and radar anti-stealth. Several full-wave simulation methods are introduced in this paper, and the RCS of an S-shaped inlet is calculated respectively using these methods implanted in the commercial software CST MICROWAVE STUDIOreg (CST MWS). The calculated results in CST MWS are in agreement with the measurement. Finally, these methods, which are compared in terms of accuracy, memory requirements and CPU time, are discussed with respect to the advantages and limitations in calculating the RCS of electrically large concave structures.